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using UnityEngine;
//behaviour which should lie on the same gameobject as the main camera
public class NormalPostprocessing : MonoBehaviour {
//material that's applied when doing postprocessing
private Material postprocessMaterial;
private Camera cam;
private void Start(){
//get the camera and tell it to render a depthnormals texture
cam = GetComponent<Camera>();
cam.depthTextureMode = cam.depthTextureMode | DepthTextureMode.DepthNormals;
//method which is automatically called by unity after the camera is done rendering
private void OnRenderImage(RenderTexture source, RenderTexture destination){
//get viewspace to worldspace matrix and pass it to shader
Matrix4x4 viewToWorld = cam.cameraToWorldMatrix;
postprocessMaterial.SetMatrix("_viewToWorld", viewToWorld);
//draws the pixels from the source texture to the destination texture
Graphics.Blit(source, destination, postprocessMaterial);