在 WPF 3D 中，如何确定 Cube 的顶点是否可见

Question

We know that the cube has eight vertices, and we can easily build a cube using the Media3D of WPF. But how to determine whether the vertex of the cube is visible.

Just as the following pictures show, the red vertex should be invisible, while the others should be visible.

Answer 1

If any of the faces connected to the vertex has a normal facing the camera (see back face culling), the vertex is visible. This should be pretty quick to calculate.

If you need actual visibility in a complex scene, some other solution like stencil buffer as TiberiumFusion suggested should be used.