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//
// Vertex shader for Gooch shading
//
// Author: Randi Rost
//
// Copyright (c) 2002-2004 3Dlabs Inc. Ltd.
//
// See 3Dlabs-License.txt for license information
//
uniform vec3 LightPosition; // (0.0, 10.0, 4.0)
varying float NdotL;
varying vec3 ReflectVec;
varying vec3 ViewVec;
void main(void)
{
vec3 ecPos = vec3 (gl_ModelViewMatrix * gl_Vertex);
vec3 tnorm = normalize(gl_NormalMatrix * gl_Normal);
vec3 lightVec = normalize(LightPosition - ecPos);
ReflectVec = normalize(reflect(-lightVec, tnorm));
ViewVec = normalize(-ecPos);
NdotL = (dot(lightVec, tnorm) + 1.0) * 0.5;
gl_Position = ftransform();
}
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