2022-04-20 unity introduction 5 - Camera

One 、 Parameter panel

Two 、 Parameter Introduction

1. Clear Flags： Clear the background

   • Skybox： Sky box background （ Usually used to make 3D game ）

   • Solid Color： Use Background Color fill （ Usually set to all black or all white ,2D Use ）

   • Depth Only： Draw only this layer , The background is transparent （ Use when multiple cameras overlay rendering ）

   • Don’t Clear： Do not remove the previous frame , Overlay rendering , Usually do not use

     stay Game Cancel the following settings under the window , Moving objects , You will see a superimposed shadow ：

2. Background： The background color , Match as above Clear Flags Use

3. Culling Mask： Selective rendering part Layer Hierarchy

   You can set the Layer Hierarchy , And then in Camera Medium Culling Mask Set the level to be displayed .

4. Projection： Projection mode

   • Perspective： Perspective mode , The object is near big and far small

     • FOV Axis： Field angle 、 Axis

       Decided the following Field of View Is it calculated horizontally or vertically , Generally, there is no need to change

     • Field of View： Viewport size

     • Physical Camera： Physical camera

       2019 The new version features , When checked, simulate the focal length of the camera in the real world 、 Sensor size 、 Lens displacement, etc , Generally not used

       
       • Focal Length： The focal length
       • Sensor Type： Sensor type
       • Sensor Size： Sensor size
       • Lens Shift： Lens shift
       • Gate Fit： Gate fit

   • Orthographic： Orthogonal mode , The objects displayed far and near are the same size

     • Size： The range of settings

5. Clipping Planes： Clipping plane distance

   The area shown by the camera is a pyramid , Not a pyramid .

   

6. Viewport Rect： Camera viewport range

   Determines the position and size of the camera drawing on the screen , Mainly used in dual camera Games ,0 ~ 1 Expressed as a percentage

7. Depth： Depth of rendering order

   Depth The bigger it is , The lower the priority , After being rendered , The higher the picture is

   Can cooperate with Clear Flags Medium Depth Only Use （UICamera）

8. Rendering Path： Render path

   You can ignore it at present

9. Target Texture： Render textures

   Project the picture of the camera onto a picture , The drawing needs to be in Project Right click to create Render Texture

   Mainly used for making small maps

10. Occlusion Culling： Whether to enable culling occlusion

    Occluded objects will not be rendered , Usually check , To save performance

11. HDR： High dynamic range rendering

    You can ignore it at present

12. MSAA： Anti-Aliasing

    You can ignore it at present

13. Allow Dynamic Resolution： Whether to allow dynamic resolution rendering

    You can ignore it at present

14. Target Display： On which display is the camera drawn

    It is mainly used to develop platform games with multiple screens

15. Target Eye：VR Is it displayed in the left eye or the right eye

    You can ignore it at present

16. Target Display： On which display is the camera drawn

    It is mainly used to develop platform games with multiple screens

17. Target Eye：VR Is it displayed in the left eye or the right eye

3、 ... and 、 Code control

（ One ） Important static members

1. Get the camera

//  If you use previous knowledge   To get the camera 
//  Acquisition of main camera 
//  If you want to pass this way   Get the camera quickly   Then there must be one in the scene tag by MainCamera The video camera 
print(Camera.main.name);

//  Number of cameras acquired 
print(Camera.allCamerasCount);

//  Get all the cameras 
Camera[] allCamera = Camera.allCameras;
print(allCamera.Length);

2. Rendering related delegates

//  Delegate function for camera culling pre-processing 
Camera.onPreCull += (c) => {
     };

//  The camera   Delegate before rendering 
Camera.onPreRender += (c) => {
     };

//  The camera   After rendering   Processing delegation 
Camera.onPostRender += (c) => {
     };

（ Two ） Key members

1. Interface parameters

//  Parameters on the interface   Can be in Camera Get to the 
//  such as   The following code   Is to get the main camera object   The depth of the   Set it up 
Camera.main.depth = 10;

2. World coordinates to screen coordinates

//  After conversion  x and y The corresponding screen coordinates  z Corresponding   yes   This 3D object   How far is our camera in 
//  We will use this to do the function   The most   Is the function related to the blood bar on the top of the head 
Vector3 v = Camera.main.WorldToScreenPoint(this.transform.position);

3. Screen coordinates to world coordinates

//  The reason for the change Z Axis   Because   If you don't change  Z The default is 0
//  Convert points in the past world coordinate system   Always a point   It can be understood as   viewport   Intersecting focus 
//  If it changes Z  Then change the past   Point of world coordinates   It's relative to   How many units in front of the camera are the world coordinate points on the cross section 
Vector3 v = Input.mousePosition;
v.z = 5;
obj.position = Camera.main.ScreenToWorldPoint(v);