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/*=========================================================================
Program: Visualization Toolkit
Module: vtkglprojectedTetrahdraFS.glsl
Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
All rights reserved.
See Copyright.txt or http://www.kitware.com/Copyright.htm for details.
This software is distributed WITHOUT ANY WARRANTY; without even
the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
PURPOSE. See the above copyright notice for more information.
=========================================================================*/
// The following line handle system declarations such a
// default precisions, or defining precisions to null
//VTK::System::Dec
//VTK::Output::Dec
varying vec3 fcolor;
varying float fdepth;
varying float fattenuation;
void main()
{
// the following exp is done in the fragment shader
// because linear interpolation (from the VS) of the resulting
// value would not match the exp of the interpolated
// source values
float opacity = 1.0 - exp(-1.0*fattenuation*fdepth);
gl_FragData[0] = vec4(opacity*fcolor,opacity);
if (gl_FragData[0].a <= 0.0)
{
discard;
}
}
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