1 | /*
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2 | * ----------------------------------------------------------------------
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3 | * Plane.cpp: plane class
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4 | *
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5 | * ======================================================================
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6 | * AUTHOR: Wei Qiao <qiaow@purdue.edu>
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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 | #include <assert.h>
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16 | #include "Plane.h"
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17 |
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18 | Plane::Plane(){}
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19 |
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20 | Plane::Plane(float _a, float _b, float _c, float _d) {
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21 | this->a = _a;
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22 | this->b = _b;
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23 | this->c = _c;
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24 | this->d = _d;
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25 |
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26 | assert(a != 0 || b != 0 || c != 0);
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27 | }
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28 |
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29 | Plane::Plane(float coeffs[4]) {
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30 | a = coeffs[0];
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31 | b = coeffs[1];
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32 | c = coeffs[2];
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33 | d = coeffs[3];
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34 |
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35 | assert(a != 0 || b != 0 || c != 0);
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36 | }
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37 |
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38 | void Plane::get_normal(Vector3 &normal){
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39 | normal.x = a;
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40 | normal.y = b;
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41 | normal.z = c;
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42 | }
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43 |
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44 | void Plane::get_point(Vector3 &point){
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45 | if(a != 0){
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46 | point.x = -d/a;
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47 | point.y = 0;
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48 | point.z = 0;
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49 | }
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50 | else if(b != 0){
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51 | point.y = -d/b;
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52 | point.x = 0;
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53 | point.z = 0;
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54 | }
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55 | else if(c != 0){
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56 | point.z = -d /c;
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57 | point.y = 0;
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58 | point.x = 0;
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59 | }
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60 | else{
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61 | assert(false);
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62 | }
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63 | }
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64 |
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65 | Vector4 Plane::get_coeffs(){
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66 | Vector4 ret(a, b, c, d);
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67 | return ret;
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68 | }
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69 |
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70 | void Plane::set_coeffs(float _a, float _b, float _c, float _d){
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71 | a = _a;
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72 | b = _b;
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73 | c = _c;
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74 | d = _d;
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75 | }
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76 |
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77 | void Plane::transform(Mat4x4 mat) {
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78 | Vector4 coeffs(a, b, c, d);
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79 | Mat4x4 inv = mat.inverse();
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80 | Vector4 new_coeffs = inv.multiply_row_vector(coeffs);
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81 |
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82 | a = new_coeffs.x;
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83 | b = new_coeffs.y;
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84 | c = new_coeffs.z;
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85 | d = new_coeffs.w;
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86 | }
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87 |
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88 | void Plane::transform(float *m){
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89 | Mat4x4 mat(m);
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90 | transform(mat);
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91 | }
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92 |
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93 | bool Plane::retains(Vector3 point){
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94 | return (a * point.x + b * point.y + c * point.z + d >= 0);
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95 | }
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