varying float Z;
varying vec4 Color;
varying vec3 MCposition;
varying float LightIntensity; 


void
main( void )
{
	vec3 tnorm      = normalize( gl_NormalMatrix * gl_Normal );
	vec3 LightPos = vec3( 0., 0., 10. );
	vec3 ECposition = ( gl_ModelViewMatrix * gl_Vertex ).xyz;
	LightIntensity  = dot( normalize(LightPos - ECposition), tnorm );
	LightIntensity = abs( LightIntensity );
	LightIntensity *= 1.25;

	Color = gl_Color;
	MCposition = gl_Vertex.xyz;
	Z = -ECposition.z;	// distance in front of the eye
	gl_Position = gl_ModelViewProjectionMatrix * gl_Vertex;
}