varying vec4  Color;
varying float LightIntensity; 

void main()
{
    	vec3 tnorm      = normalize( vec3( gl_NormalMatrix * gl_Normal ) );
	vec3 LightPos = vec3( 0., 0., 10. );
	vec3 ECposition = vec3( gl_ModelViewMatrix * gl_Vertex );
    	LightIntensity  = dot( normalize(LightPos - ECposition), tnorm );
    	LightIntensity = abs( LightIntensity );
    	LightIntensity *= 1.5;

	gl_TexCoord[0] = gl_MultiTexCoord0;
	Color = gl_Color;
	gl_Position     = ftransform();	// same as "gl_ModelViewProjectionMatrix * gl_Vertex"
}