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varying vec3 varposition;
varying vec3 varnormal;
void main()
{
vec4 co = gl_ModelViewMatrix * gl_Vertex;
varposition = co.xyz;
varnormal = normalize(gl_NormalMatrix * gl_Normal);
gl_Position = gl_ProjectionMatrix * co;
// Setting gl_ClipVertex is necessary to get glClipPlane working on NVIDIA graphic cards.
// gl_ClipVertex works only on NVIDIA graphic cards so we have to check with
// __GLSL_CG_DATA_TYPES if a NVIDIA graphic card is used (Cg support).
// gl_ClipVerte is supported up to GLSL 1.20.
#ifdef __GLSL_CG_DATA_TYPES
gl_ClipVertex = gl_ModelViewMatrix * gl_Vertex;
#endif
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