layout(triangles, equal_spacing, ccw) in;
uniform mat4 mvp;
in vec4 fct[];
out vec4 fcolor;
in vec4 cntr[];

vec4 n4_test(vec4 p){
	vec3 offset = p.xyz - cntr[0].xyz;
	return vec4(cntr[0].xyz + normalize(offset), 1);
}

void main(){
	vec4 p = 
			gl_TessCoord.x * gl_in[0].gl_Position +
			gl_TessCoord.y * gl_in[1].gl_Position +
			gl_TessCoord.z * gl_in[2].gl_Position;
	gl_Position = mvp * n4_test(p);

	fcolor = 
			gl_TessCoord.x * fct[0] +
			gl_TessCoord.y * fct[1] +
			gl_TessCoord.z * fct[2];
}