Unity screen coordinates to world coordinates, mouse click to get 3D position

Raycast(): first object information for detecting ray collisions

//Right mouse buttonif (Input.GetMouseButtonDown(1)) {// emit rays//Ray ray = new Ray();//Create a rayRay ray = Camera.main.ScreenPointToRay(Input.mousePosition);//Ray detection: get the position where the ray collides with the collider component//Physics.Raycast();if (Physics.Raycast(ray, out RaycastHit raycastHit )) {print(raycastHit.point)//Print the three-dimensional world coordinates of the ray collision}}

The content of the parameters is roughly: ray, length, out collision information output, limit the layer layer that can be detected.

layer control

There are 32 layers in total, which are represented by an int type number.Four bytes and 32 bits respectively represent the corresponding layer layer
Example: Make the ray not collide with the Model layer

//The bit representing the Model layer is 0, and the other bits are 1, so that other layers can be detected, and the Model cannot beint layerMask = ~(1 << 10);Physics.Raycast(ray, out RaycastHit raycastHit, layerMask)

RaycastAll(): Multiple object information for detecting ray collisions

RaycastHit[] hitInfo = Physics.Raycast(ray)