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在UNITY3D中，Camera.projectionMatrix 為相機(jī)的投影矩陣

如果你改變這個矩陣，相機(jī)的渲染不再基于它的fieldOfView更新，直到調(diào)用ResetProjectionMatrix. 只有當(dāng)真正需要一個非標(biāo)準(zhǔn)的投影時，才使用自定義投影。這個屬性被Unity的水渲染使用來設(shè)置一個oblique projection 矩陣。使用自定義投影需要了解變換和投影矩陣。

using UnityEngine;
using System.Collections;

//讓相機(jī)以流行的方式晃動
public class example : MonoBehaviour {
 public Matrix4x4 originalProjection;
 void Update() {
  //改變原始矩陣的某些值
             Matrix4x4 p = originalProjection;
  p.m01 += Mathf.Sin(Time.time * 1.2F) * 0.1F;
  p.m10 += Mathf.Sin(Time.time * 1.5F) * 0.1F;
  camera.projectionMatrix = p;
 }
 public void Awake() {
  originalProjection = camera.projectionMatrix;
 }
}

可以發(fā)現(xiàn)攝像機(jī)投影矩陣是個三行四列的矩陣；

//設(shè)置一個偏移中心的投影，這個透視的消失點(diǎn)沒有必要在屏幕的中心
//定義近載面大小，例如相機(jī)的近裁面偏移中心多少
//改變這個值你就能看到相機(jī)視圖的變化
using UnityEngine;
using System.Collections;

public class example : MonoBehaviour {
 public float left = -0.2F;
 public float right = 0.2F;
 public float top = 0.2F;
 public float bottom = -0.2F;
 void LateUpdate() {
  Camera cam = camera;
  Matrix4x4 m = PerspectiveOffCenter(left, right, bottom, top, cam.nearClipPlane, cam.farClipPlane);
  cam.projectionMatrix = m;
 }
 static Matrix4x4 PerspectiveOffCenter(float left, float right, float bottom, float top, float near, float far) {
  float x = 2.0F * near / right - left;
  float y = 2.0F * near / top - bottom;
  float a = right + left / right - left;
  float b = top + bottom / top - bottom;
  float c = -far + near / far - near;
  float d = -2.0F * far * near / far - near;
  float e = -1.0F;
  Matrix4x4 m;
  m[0, 0] = x;
  m[0, 1] = 0;
  m[0, 2] = a;
  m[0, 3] = 0;
  m[1, 0] = 0;
  m[1, 1] = y;
  m[1, 2] = b;
  m[1, 3] = 0;
  m[2, 0] = 0;
  m[2, 1] = 0;
  m[2, 2] = c;
  m[2, 3] = d;
  m[3, 0] = 0;
  m[3, 1] = 0;
  m[3, 2] = e;
  m[3, 3] = 0;
  return m;
 }
}