[587] | 1 | /* |
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| 2 | * ---------------------------------------------------------------------- |
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| 3 | * NvLIC.h: line integral convolution class |
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| 4 | * |
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| 5 | * ====================================================================== |
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[851] | 6 | * AUTHOR: Insoo Woo <iwoo@purdue.edu, Wei Qiao <qiaow@purdue.edu> |
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[587] | 7 | * Purdue Rendering and Perceptualization Lab (PURPL) |
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| 8 | * |
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| 9 | * Copyright (c) 2004-2006 Purdue Research Foundation |
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| 10 | * |
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| 11 | * See the file "license.terms" for information on usage and |
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| 12 | * redistribution of this file, and for a DISCLAIMER OF ALL WARRANTIES. |
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| 13 | * ====================================================================== |
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| 14 | */ |
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| 15 | |
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| 16 | |
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| 17 | #include <stdlib.h> |
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| 18 | #include <math.h> |
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| 19 | #include <assert.h> |
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| 20 | |
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[755] | 21 | #include <R2/R2FilePath.h> |
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[587] | 22 | #include "NvLIC.h" |
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[851] | 23 | #include <Trace.h> |
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[587] | 24 | |
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[851] | 25 | NvLIC::NvLIC(int _size, int _width, int _height, float _offset, CGcontext _context) |
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| 26 | : Renderable(Vector3(0.0f,0.0f,0.0f)), |
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| 27 | disListID(0), |
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| 28 | width(_width), |
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| 29 | height(_height), |
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[587] | 30 | size(_size), |
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[851] | 31 | scale(1.0f, 1.0f, 1.0f), |
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[587] | 32 | offset(_offset), |
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[851] | 33 | iframe(0), |
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[587] | 34 | Npat(64), |
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[851] | 35 | alpha((int) 0.12*255), |
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[587] | 36 | tmax(NPIX/(SCALE*NPN)), |
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[851] | 37 | dmax(SCALE/NPIX), |
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| 38 | max(1.0f), |
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| 39 | m_g_context(_context), |
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| 40 | vectorFieldID((NVISid) 0), |
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| 41 | _activate(false) |
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[587] | 42 | { |
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[851] | 43 | slice_vector = new float[size*size*4]; |
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| 44 | memset(slice_vector, 0, sizeof(float) * size * size * 4); |
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[587] | 45 | |
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[851] | 46 | //initialize the pattern texture |
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| 47 | glGenTextures(1, &pattern_tex); |
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| 48 | glBindTexture(GL_TEXTURE_2D, pattern_tex); |
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| 49 | glTexParameteri(GL_TEXTURE_2D, |
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[587] | 50 | GL_TEXTURE_WRAP_S, GL_REPEAT); |
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[851] | 51 | glTexParameteri(GL_TEXTURE_2D, |
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[587] | 52 | GL_TEXTURE_WRAP_T, GL_REPEAT); |
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[851] | 53 | glTexParameteri(GL_TEXTURE_2D, |
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[587] | 54 | GL_TEXTURE_MAG_FILTER, GL_LINEAR); |
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[851] | 55 | glTexParameteri(GL_TEXTURE_2D, |
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[587] | 56 | GL_TEXTURE_MIN_FILTER, GL_LINEAR); |
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[851] | 57 | glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_REPLACE); |
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[587] | 58 | |
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[851] | 59 | //initialize frame buffer objects |
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| 60 | //render buffer for projecting 3D velocity onto a 2D plane |
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| 61 | glGenFramebuffersEXT(1, &vel_fbo); |
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| 62 | glGenTextures(1, &slice_vector_tex); |
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[587] | 63 | |
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[851] | 64 | glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, vel_fbo); |
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[587] | 65 | |
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[851] | 66 | glBindTexture(GL_TEXTURE_RECTANGLE_NV, slice_vector_tex); |
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| 67 | glTexParameterf(GL_TEXTURE_RECTANGLE_NV, GL_TEXTURE_MIN_FILTER, GL_NEAREST); |
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| 68 | glTexParameterf(GL_TEXTURE_RECTANGLE_NV, GL_TEXTURE_MAG_FILTER, GL_NEAREST); |
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[587] | 69 | |
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[851] | 70 | // ADD INSOO |
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| 71 | glTexParameteri(GL_TEXTURE_RECTANGLE_NV, |
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| 72 | GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE); |
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| 73 | glTexParameteri(GL_TEXTURE_RECTANGLE_NV, |
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| 74 | GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE); |
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| 75 | |
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| 76 | glTexImage2D(GL_TEXTURE_RECTANGLE_NV, 0, |
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| 77 | GL_FLOAT_RGBA32_NV, size, size, 0, GL_RGBA, GL_FLOAT, NULL); |
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| 78 | |
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| 79 | glFramebufferTexture2DEXT(GL_FRAMEBUFFER_EXT, GL_COLOR_ATTACHMENT0_EXT, |
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[587] | 80 | GL_TEXTURE_RECTANGLE_NV, slice_vector_tex, 0); |
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| 81 | |
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| 82 | |
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[851] | 83 | //render buffer for the convolution |
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| 84 | glGenFramebuffersEXT(1, &fbo); |
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| 85 | glGenTextures(1, &color_tex); |
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[587] | 86 | |
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[851] | 87 | glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, fbo); |
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[587] | 88 | |
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[851] | 89 | //initialize color texture for lic |
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| 90 | glBindTexture(GL_TEXTURE_2D, color_tex); |
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| 91 | // INSOO |
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| 92 | //glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR); |
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| 93 | //glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR); |
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| 94 | glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST); |
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| 95 | glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST); |
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| 96 | |
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| 97 | glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB8, width, height, 0, |
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| 98 | GL_RGB, GL_INT, NULL); |
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| 99 | |
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| 100 | glFramebufferTexture2DEXT(GL_FRAMEBUFFER_EXT, |
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[587] | 101 | GL_COLOR_ATTACHMENT0_EXT, |
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| 102 | GL_TEXTURE_2D, color_tex, 0); |
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| 103 | |
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| 104 | |
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[851] | 105 | // Check framebuffer completeness at the end of initialization. |
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| 106 | CHECK_FRAMEBUFFER_STATUS(); |
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[587] | 107 | |
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[851] | 108 | glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, 0); |
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[587] | 109 | |
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[851] | 110 | R2string path = R2FilePath::getInstance()->getPath("render_vel.cg"); |
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| 111 | m_render_vel_fprog = loadProgram(m_g_context, CG_PROFILE_FP30, CG_SOURCE, path); |
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| 112 | m_vel_tex_param_render_vel = cgGetNamedParameter(m_render_vel_fprog, "vel_tex"); |
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| 113 | m_plane_normal_param_render_vel = cgGetNamedParameter(m_render_vel_fprog, "plane_normal"); |
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| 114 | m_max_param = cgGetNamedParameter(m_render_vel_fprog, "vmax"); |
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| 115 | |
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| 116 | |
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| 117 | make_patterns(); |
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[587] | 118 | } |
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| 119 | |
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[851] | 120 | NvLIC::~NvLIC() |
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| 121 | { |
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| 122 | glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, vel_fbo); |
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| 123 | glDeleteTextures(1, &slice_vector_tex); |
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[587] | 124 | |
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[851] | 125 | glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, fbo); |
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| 126 | glDeleteTextures(1, &color_tex); |
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[587] | 127 | |
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[851] | 128 | NVISid buffers[2] = {vel_fbo, fbo}; |
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| 129 | glDeleteFramebuffersEXT(2, buffers); |
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[587] | 130 | |
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[851] | 131 | glDeleteLists(disListID, Npat); |
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| 132 | |
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| 133 | delete slice_vector; |
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[587] | 134 | } |
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| 135 | |
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[984] | 136 | void |
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| 137 | NvLIC::make_patterns() |
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[587] | 138 | { |
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[851] | 139 | Trace("begin make_patterns\n"); |
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[984] | 140 | |
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[851] | 141 | disListID = glGenLists(Npat); |
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[984] | 142 | |
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[851] | 143 | Trace("DisplayList : %d\n", disListID); |
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[587] | 144 | |
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[984] | 145 | int lut[256]; |
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| 146 | int phase[NPN][NPN]; |
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| 147 | GLubyte pat[NPN][NPN][4]; |
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| 148 | int i, j, k, t; |
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| 149 | |
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| 150 | for (i = 0; i < 256; i++) { |
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| 151 | lut[i] = i < 127 ? 0 : 255; |
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| 152 | } |
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| 153 | for (i = 0; i < NPN; i++) { |
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| 154 | for (j = 0; j < NPN; j++) { |
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[851] | 155 | phase[i][j] = rand() % 256; |
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| 156 | } |
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[984] | 157 | } |
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| 158 | for (k = 0; k < Npat; k++) { |
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| 159 | t = k*256/Npat; |
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| 160 | for (i = 0; i < NPN; i++) { |
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| 161 | for (j = 0; j < NPN; j++) { |
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| 162 | pat[i][j][0] = |
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| 163 | pat[i][j][1] = |
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| 164 | pat[i][j][2] = lut[(t + phase[i][j]) % 255]; |
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| 165 | pat[i][j][3] = alpha; |
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| 166 | } |
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| 167 | } |
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| 168 | glNewList(disListID + k, GL_COMPILE); |
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| 169 | glBindTexture(GL_TEXTURE_2D, pattern_tex); |
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| 170 | glTexImage2D(GL_TEXTURE_2D, 0, 4, NPN, NPN, 0, |
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[587] | 171 | GL_RGBA, GL_UNSIGNED_BYTE, pat); |
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[984] | 172 | glEndList(); |
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| 173 | } |
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| 174 | |
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| 175 | glBindTexture(GL_TEXTURE_2D, pattern_tex); |
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| 176 | glTexImage2D(GL_TEXTURE_2D, 0, 4, NPN, NPN, 0, |
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| 177 | GL_RGBA, GL_UNSIGNED_BYTE, pat); |
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[851] | 178 | Trace("finish make_patterns\n"); |
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[587] | 179 | } |
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| 180 | |
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| 181 | |
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| 182 | void NvLIC::make_magnitudes() |
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| 183 | { |
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[851] | 184 | GLubyte mag[NMESH][NMESH][4]; |
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[587] | 185 | |
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[851] | 186 | //read vector filed |
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| 187 | for(int i=0; i<NMESH; i++){ |
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| 188 | for(int j=0; j<NMESH; j++){ |
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[587] | 189 | |
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| 190 | float x=DM*i; |
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| 191 | float y=DM*j; |
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| 192 | |
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| 193 | float magnitude = sqrt(x*x+y*y)/1.414; |
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| 194 | |
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| 195 | //from green to red |
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[851] | 196 | GLubyte r = (GLubyte) floor(magnitude*255); |
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[587] | 197 | GLubyte g = 0; |
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| 198 | GLubyte b = 255 - r; |
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| 199 | GLubyte a = 122; |
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| 200 | |
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| 201 | mag[i][j][0] = r; |
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| 202 | mag[i][j][1] = g; |
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| 203 | mag[i][j][2] = b; |
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| 204 | mag[i][j][3] = a; |
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[851] | 205 | } |
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[587] | 206 | } |
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| 207 | |
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[851] | 208 | glGenTextures(1, &mag_tex); |
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| 209 | glBindTexture(GL_TEXTURE_2D, mag_tex); |
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| 210 | glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT); |
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| 211 | glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT); |
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| 212 | glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR); |
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| 213 | glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR); |
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| 214 | //glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_BLEND); |
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| 215 | glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, NMESH, NMESH, 0, GL_RGBA, GL_UNSIGNED_BYTE, mag); |
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| 216 | glBindTexture(GL_TEXTURE_2D, 0); |
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[587] | 217 | } |
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| 218 | |
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[851] | 219 | void NvLIC::get_slice() |
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| 220 | { |
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| 221 | glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, vel_fbo); |
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[587] | 222 | |
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[851] | 223 | glClear(GL_COLOR_BUFFER_BIT); |
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[587] | 224 | |
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[851] | 225 | glViewport(0, 0, size, size); |
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| 226 | glMatrixMode(GL_PROJECTION); |
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| 227 | glLoadIdentity(); |
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| 228 | gluOrtho2D(0, size, 0, size); |
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| 229 | glMatrixMode(GL_MODELVIEW); |
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| 230 | glLoadIdentity(); |
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[587] | 231 | |
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[851] | 232 | glEnable(GL_TEXTURE_3D); |
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| 233 | glBindTexture(GL_TEXTURE_3D, vectorFieldID); |
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| 234 | cgGLBindProgram(m_render_vel_fprog); |
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[587] | 235 | |
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[851] | 236 | cgGLSetTextureParameter(m_vel_tex_param_render_vel, vectorFieldID); |
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| 237 | cgGLEnableTextureParameter(m_vel_tex_param_render_vel); |
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| 238 | cgGLSetParameter4f(m_plane_normal_param_render_vel, 1., 1., 0., 0); |
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| 239 | cgGLSetParameter1f(m_max_param, max); |
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| 240 | |
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| 241 | cgGLEnableProfile(CG_PROFILE_FP30); |
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| 242 | |
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| 243 | glBegin(GL_QUADS); |
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| 244 | glTexCoord3f(0., 0., offset); glVertex2f(0., 0.); |
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| 245 | glTexCoord3f(1., 0., offset); glVertex2f(size, 0.); |
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| 246 | glTexCoord3f(1., 1., offset); glVertex2f(size, size); |
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| 247 | glTexCoord3f(0., 1., offset); glVertex2f(0., size); |
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| 248 | glEnd(); |
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| 249 | |
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| 250 | cgGLDisableProfile(CG_PROFILE_FP30); |
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[587] | 251 | |
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[851] | 252 | cgGLDisableTextureParameter(m_vel_tex_param_render_vel); |
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[587] | 253 | |
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[851] | 254 | glBindTexture(GL_TEXTURE_3D, 0); |
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| 255 | glDisable(GL_TEXTURE_3D); |
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| 256 | |
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| 257 | //read the vectors |
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| 258 | glReadPixels(0, 0, size, size, GL_RGBA, GL_FLOAT, slice_vector); |
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| 259 | glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, 0); |
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| 260 | |
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| 261 | int lim = size * size * 4; |
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| 262 | float* v= slice_vector; |
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| 263 | for (int i = 0; i < lim; ++i) |
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| 264 | { |
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| 265 | if (isnan(*v)) *v = 0.0f; |
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| 266 | ++v; |
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| 267 | } |
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[587] | 268 | } |
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| 269 | |
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| 270 | //line integral convolution |
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[851] | 271 | void NvLIC::convolve() |
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| 272 | { |
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| 273 | int i, j; |
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| 274 | float x1, x2, y, px, py; |
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[587] | 275 | |
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[851] | 276 | glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, fbo); |
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[587] | 277 | |
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[851] | 278 | glMatrixMode(GL_PROJECTION); |
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| 279 | glLoadIdentity(); |
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| 280 | glPushAttrib(GL_VIEWPORT_BIT | GL_ENABLE_BIT); |
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| 281 | glViewport(0, 0, (GLsizei) NPIX, (GLsizei) NPIX); |
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| 282 | //glTranslatef(-1.0, -1.0, 0.0); |
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| 283 | //glScalef(2.0, 2.0, 1.0); |
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| 284 | glOrtho(0.0f, 1.0f, 0.0f, 1.0f, -10.0f, 10.0f); |
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[587] | 285 | |
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[851] | 286 | glMatrixMode(GL_MODELVIEW); |
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| 287 | glLoadIdentity(); |
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[587] | 288 | |
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[851] | 289 | glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); |
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| 290 | |
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| 291 | //sa = 0.010*cos(iframe*2.0*M_PI/200.0); |
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| 292 | glEnable(GL_TEXTURE_2D); |
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| 293 | glBindTexture(GL_TEXTURE_2D, pattern_tex); |
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| 294 | sa = 0.01; |
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| 295 | |
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| 296 | for (i = 0; i < NMESH-1; i++) |
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| 297 | { |
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| 298 | x1 = DM*i; x2 = x1 + DM; |
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| 299 | glBegin(GL_QUAD_STRIP); |
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| 300 | for (j = 0; j < NMESH-1; j++) { |
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[587] | 301 | y = DM*j; |
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| 302 | glTexCoord2f(x1, y); |
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| 303 | get_velocity(x1, y, &px, &py); |
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| 304 | glVertex2f(px, py); |
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| 305 | |
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| 306 | glTexCoord2f(x2, y); |
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| 307 | get_velocity(x2, y, &px, &py); |
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| 308 | glVertex2f(px, py); |
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[851] | 309 | } |
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| 310 | glEnd(); |
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[587] | 311 | } |
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| 312 | iframe = iframe + 1; |
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| 313 | |
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| 314 | glEnable(GL_BLEND); |
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[851] | 315 | |
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| 316 | // INSOO ADD |
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| 317 | glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA); |
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| 318 | |
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| 319 | glEnable(GL_TEXTURE_2D); |
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| 320 | glCallList(iframe % Npat + disListID); |
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[587] | 321 | glBegin(GL_QUAD_STRIP); |
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| 322 | glTexCoord2f(0.0, 0.0); glVertex2f(0.0, 0.0); |
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| 323 | glTexCoord2f(0.0, tmax); glVertex2f(0.0, 1.0); |
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| 324 | glTexCoord2f(tmax, 0.0); glVertex2f(1.0, 0.0); |
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| 325 | glTexCoord2f(tmax, tmax); glVertex2f(1.0, 1.0); |
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| 326 | glEnd(); |
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[851] | 327 | glDisable(GL_TEXTURE_2D); |
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[587] | 328 | |
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| 329 | /* |
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| 330 | //inject dye |
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| 331 | glDisable(GL_TEXTURE_2D); |
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| 332 | glColor4f(1.,0.8,0.,1.); |
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| 333 | glBegin(GL_QUADS); |
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| 334 | glVertex2d(0.6, 0.6); |
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| 335 | glVertex2d(0.6, 0.62); |
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| 336 | glVertex2d(0.62, 0.62); |
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| 337 | glVertex2d(0.62, 0.6); |
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| 338 | glEnd(); |
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| 339 | */ |
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| 340 | |
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[851] | 341 | /// INSOO ADDED |
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| 342 | glDisable(GL_ALPHA_TEST); |
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| 343 | |
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[587] | 344 | glDisable(GL_BLEND); |
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| 345 | glCopyTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, 0, 0, NPIX, NPIX, 0); |
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| 346 | |
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| 347 | /* |
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| 348 | //blend magnitude texture |
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| 349 | glBindTexture(GL_TEXTURE_2D, mag_tex); |
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| 350 | glEnable(GL_TEXTURE_2D); |
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| 351 | glEnable(GL_BLEND); |
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| 352 | glBegin(GL_QUADS); |
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| 353 | glTexCoord2f(0.0, 0.0); glVertex2f(0.0, 0.0); |
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| 354 | glTexCoord2f(0.0, 1.0); glVertex2f(0.0, 1.); |
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| 355 | glTexCoord2f(1.0, 1.0); glVertex2f(1., 1.); |
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| 356 | glTexCoord2f(1.0, 0.0); glVertex2f(1., 0.0); |
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| 357 | glEnd(); |
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| 358 | */ |
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[851] | 359 | |
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| 360 | glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, 0); |
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| 361 | |
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| 362 | glPopAttrib(); |
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| 363 | |
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| 364 | glPopMatrix(); |
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| 365 | glMatrixMode(GL_PROJECTION); |
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| 366 | glPopMatrix(); |
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| 367 | glMatrixMode(GL_MODELVIEW); |
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[587] | 368 | } |
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| 369 | |
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| 370 | void NvLIC::render(){ display(); } |
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| 371 | |
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| 372 | |
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[851] | 373 | void NvLIC::display() |
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| 374 | { |
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[587] | 375 | glBindTexture(GL_TEXTURE_2D, color_tex); |
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| 376 | glEnable(GL_TEXTURE_2D); |
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| 377 | |
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| 378 | //draw line integral convolution quad |
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| 379 | glEnable(GL_DEPTH_TEST); |
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[851] | 380 | |
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[587] | 381 | glPushMatrix(); |
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| 382 | |
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[851] | 383 | //glScalef(scale.x, scale.y, scale.z); |
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| 384 | float w = 1.0f / scale.x; |
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| 385 | glScalef(1.0f, 1.0f / scale.y / w, 1.0f / scale.z / w); |
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| 386 | |
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[587] | 387 | glBegin(GL_QUADS); |
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| 388 | glTexCoord2f(0, 0); glVertex3f(0, 0, offset); |
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| 389 | glTexCoord2f(1, 0); glVertex3f(1, 0, offset); |
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| 390 | glTexCoord2f(1, 1); glVertex3f(1, 1, offset); |
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| 391 | glTexCoord2f(0, 1); glVertex3f(0, 1, offset); |
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| 392 | glEnd(); |
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| 393 | |
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| 394 | glPopMatrix(); |
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| 395 | |
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[851] | 396 | glBindTexture(GL_TEXTURE_2D,0); |
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| 397 | |
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[587] | 398 | glDisable(GL_DEPTH_TEST); |
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| 399 | glDisable(GL_TEXTURE_2D); |
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[851] | 400 | |
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[587] | 401 | } |
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[851] | 402 | /* |
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| 403 | { |
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| 404 | //Trace("RENDER LIC\n"); |
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| 405 | //glBindTexture(GL_TEXTURE_2D, pattern_tex); |
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| 406 | glCallList(1 % Npat + disListID); |
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| 407 | glEnable(GL_TEXTURE_2D); |
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[587] | 408 | |
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[851] | 409 | //draw line integral convolution quad |
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| 410 | glEnable(GL_DEPTH_TEST); |
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[587] | 411 | |
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[851] | 412 | glPushMatrix(); |
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| 413 | |
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| 414 | glScalef(scale.x, scale.y, scale.z); |
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| 415 | |
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| 416 | glColor3f(1, 0, 1); |
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| 417 | glBegin(GL_QUADS); |
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| 418 | glTexCoord2f(0, 0); glVertex3f(0, 0, offset); |
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| 419 | glTexCoord2f(1, 0); glVertex3f(1, 0, offset); |
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| 420 | glTexCoord2f(1, 1); glVertex3f(1, 1, offset); |
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| 421 | glTexCoord2f(0, 1); glVertex3f(0, 1, offset); |
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| 422 | glEnd(); |
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| 423 | |
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| 424 | glPopMatrix(); |
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| 425 | |
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| 426 | glBindTexture(GL_TEXTURE_2D,0); |
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| 427 | glDisable(GL_TEXTURE_2D); |
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| 428 | |
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| 429 | glDisable(GL_DEPTH_TEST); |
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| 430 | glDisable(GL_TEXTURE_RECTANGLE_NV); |
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| 431 | } |
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| 432 | */ |
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| 433 | |
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| 434 | |
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| 435 | void NvLIC::setVectorField(unsigned int texID, float scaleX, float scaleY, float scaleZ, float max) |
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| 436 | { |
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| 437 | Trace("NvLIC: vector field is assigned [%d]\n", texID); |
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| 438 | vectorFieldID = texID; |
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| 439 | scale = Vector3(scaleX, scaleY, scaleZ); |
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| 440 | this->max = max; |
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| 441 | |
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| 442 | get_slice(); |
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| 443 | } |
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| 444 | |
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[587] | 445 | void NvLIC::get_velocity(float x, float y, float *px, float *py) |
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| 446 | { |
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[851] | 447 | float vx, vy, r; |
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[587] | 448 | |
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[851] | 449 | int xi = (int) (x*size); |
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| 450 | int yi = (int) (y*size); |
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[587] | 451 | |
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[851] | 452 | //Trace("(xi yi) = (%d %d), ", xi, yi); |
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| 453 | vx = slice_vector[4 * (xi+yi*size)]; |
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| 454 | vy = slice_vector[4 * (xi+yi*size)+1]; |
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[587] | 455 | r = vx*vx + vy*vy; |
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[851] | 456 | |
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| 457 | //Trace("(vx vx) = (%f %f), r=%f, ", vx, vy, r); |
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[587] | 458 | if (r > dmax*dmax) { |
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| 459 | r = sqrt(r); |
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| 460 | vx *= dmax/r; |
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| 461 | vy *= dmax/r; |
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| 462 | } |
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[851] | 463 | |
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[587] | 464 | *px = x + vx; |
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| 465 | *py = y + vy; |
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[851] | 466 | |
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| 467 | //Trace("vel %f %f -> %f %f, (dmax = %f)\n", x, y, *px, *py, dmax); |
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[587] | 468 | } |
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| 469 | |
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| 470 | void NvLIC::set_offset(float v) |
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| 471 | { |
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| 472 | offset = v; |
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| 473 | get_slice(); |
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| 474 | } |
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