ENTITY* old_ent;  //a second entity pointer

function scan_ent()
{
	//check mouseklick, if mouse_ent is different NULL and if mouse_ent  is different old_ent
	if(mouse_left && mouse_ent && old_ent != mouse_ent)
	{
		//set the old_ent´s default ambients
		old_ent.ambient_red = 0; old_ent.ambient_green = 0; old_ent.ambient_blue = 0;
		//set the new entities ambients
		mouse_ent.ambient_red = 255; mouse_ent.ambient_green = 0; mouse_ent.ambient_blue = 0;
		//set old-ent to mouse_ent. The model keeps his new ambient, until another one is clicked
		old_ent = mouse_ent;
	}
}