Unigine.PhysicsIntersectionNormal Class

// AppWorldlogic.cs

using Unigine;

#if UNIGINE_DOUBLE
    using Vec3 = Unigine.dvec3;
    using Vec4 = Unigine.dvec4;
    using Mat4 = Unigine.dmat4;
#else
    using Vec3 = Unigine.vec3;
    using Vec4 = Unigine.vec4;
    using Mat4 = Unigine.mat4;
#endif

namespace UnigineApp
{
	class AppWorldLogic : WorldLogic
	{

		public override int init()
		{

            // create a mesh instance with a box surface
            Mesh mesh = new Mesh();
            mesh.addBoxSurface("box", new vec3(2.2f));
            
            // create a new dynamic mesh from the Mesh instance and add it to editor
            ObjectMeshDynamic dynamic_mesh = new ObjectMeshDynamic(mesh);
            dynamic_mesh.release();
            Editor.get().addNode(dynamic_mesh.getNode());

            // assign a material and a property to the dynamic mesh
            dynamic_mesh.setWorldTransform(MathLib.translate(new Vec3(0.0f, 0.0f, 2.0f)));
            dynamic_mesh.setMaterial("mesh_base", "*");
            dynamic_mesh.setProperty("surface_base", "*");

            // assign a body and a shape to the dynamic mesh	
            BodyRigid body = new BodyRigid(dynamic_mesh);
            ShapeBox shape = new ShapeBox(body, new vec3(2.2f));

			return 1;
		}

		public override int update() {

			// initialize points of the mouse direction
			Vec3 p0, p1;

			// get the current player (camera)
			Player player = Game.get().getPlayer();
			if (player == null)
				return 0;
			// get width and height of the current application window
			int width = App.get().getWidth();
			int height = App.get().getHeight();
			// get the current X and Y coordinates of the mouse pointer
			int mouse_x = App.get().getMouseX();
			int mouse_y = App.get().getMouseY();
			// get the mouse direction from the player's position (p0) to the mouse cursor pointer (p1)
			player.getDirectionFromScreen(out p0, out p1, mouse_x, mouse_y, width, height);

			// create the instance of the PhysicsIntersectionNormal object to save the information about the intersection
			PhysicsIntersectionNormal intersection = new PhysicsIntersectionNormal();
			// get an intersection
			Unigine.Object obj = Physics.get().getIntersection(p0, p1, 1, intersection);

			// if the intersection has been occurred, change the parameter of the object's material    
			if (obj != null)
			{
				for (int i = 0; i < obj.getNumSurfaces(); i++)
				{
					obj.setMaterialParameter("albedo_color", new vec4(1.0f, 1.0f, 0.0f, 1.0f), i);
				}

				// if the intersected object has a shape, show the information about the intersection normal  
				Shape shape = intersection.getShape();
				if (shape != null)
				{
					Log::message("Normal: type {0} coordinates ({1} {2} {3})\n", intersection.getNormal().GetType(),
						intersection.getNormal().x,
						intersection.getNormal().y,
						intersection.getNormal().z);
				}
			}

			return 1;
		}
	}
}