/* -*- mode: c++; c-basic-offset: 4; indent-tabs-mode: nil -*- */
/*
 * Copyright (c) 2004-2013  HUBzero Foundation, LLC
 *
 * Authors:
 *   Wei Qiao <qiaow@purdue.edu>
 */

float4 main(float4 texCoord : TEXCOORD0,
            uniform float opacity, 
            uniform sampler1D tf) : COLOR
{
    float4 color = tex1D(tf, texCoord.z);
    color.w = opacity;
    return color;
}