out vec4 pixelpos;

void main()
{
	// perform exactly the same relevant steps as in the main shader to ensure matching results (that also means including the model matrix here!)
	vec4 worldcoord = ModelMatrix * gl_Vertex;
	vec4 eyeCoordPos = ViewMatrix * worldcoord;

	pixelpos.xyz = worldcoord.xyz;
	pixelpos.w = -eyeCoordPos.z/eyeCoordPos.w;
	
	gl_Position = ProjectionMatrix * eyeCoordPos;
}