How to detect collisions between objects and borders

This also brings a new problem: the camera moves without any obstruction, which is called "through-wall mode". Is there any way to solve this problem? Yes, there is a "collision detection" before moving the camera to make sure that there is no other 3D model in the new position of the camera. In this article, we will introduce how to do 3D collision detection in WPF. IntersectsWith method Before we move on to the next section, let's take a look at the simplest way of collision detection: using the Rect3D. IntersectsWith to determine if the rectangle where the camera position is located intersects this Rect3D. If yes, the camera moves inside the Rect3D and a collision occurs; if no, the camera is still some distance away from the Model3D and can safely move. No collision occurs Collision occurs using the Rect3D.IntersectsWith method, which works well for regular squares. However, if you use the Rect3D.IntersectsWith method to detect if the camera collides with the outer polygon of an irregular object, the accuracy will be much lower. Take the above picture for example, the camera of the red square is actually far away from the house, but it is in the area where the house is located, at this time, the result of Rect3D.IntersectsWith is "collision occurred". Therefore, a slightly more complex method, VisualTreeHelper.HitTest, is needed to perform hit tests on 3D objects to deal with the problem of collision detection of irregular objects. Utilizing the VisualTreeHelper.HitTest method VisualTreeHelper.HitTest is made up of three functions overloaded in the 3D world using: public static void HitTest( Visual3D reference, VisualTreeHelper. HitTestFilterCallback filterCallback, HitTestResultCallback resultCallback, HitTestParameters3D hitTestParameters ) method to perform the hit test. reference: the Visual3D to be Visual3D to perform the hit test, i.e. the irregular 3D objects in the scene. filterCallback: the method that represents the filter callback value for the hit test, sometimes not all 3D objects are impenetrable, for example, the water in the swimming pool can't stop the Camera from moving if it is not frozen, so you can set the filterCallback for these objects. filterCallback sets these objects. resultCallback: the method that represents the hit test result callback value. hitTestParameters: the 3D parameter values to be hit tested. For the last parameter, hitTestParameters, a subclass of HitTestParameters3D is used: RayHitTestParameters (and currently the only subclass of HitTestParameters3D). This class represents a ray. When you see this, you will generally understand how to use VisualTreeHelper.HitTest for collision detection, right? HitTest!