Camera.projectionMatrix

Description

Set a custom projection matrix.

If you change this matrix, the camera no longer updates its rendering based on its fieldOfView. This lasts until you call ResetProjectionMatrix.

Use a custom projection only if you really need a non-standard projection. This property is used by Unity's water rendering to setup an oblique projection matrix. Using custom projections requires good knowledge of transformation and projection matrices.

	// Make camera wobble in a funky way!
	var originalProjection : Matrix4x4;
	originalProjection = camera.projectionMatrix;
	
	function Update () {
		var p : Matrix4x4 = originalProjection;
		// change some values from the original matrix
		p.m01 += Mathf.Sin (Time.time * 1.2) * 0.1;
		p.m10 += Mathf.Sin (Time.time * 1.5) * 0.1;
		camera.projectionMatrix = p;
	}

using UnityEngine;
using System.Collections;

public class ExampleClass : MonoBehaviour {
    public Matrix4x4 originalProjection;
    void Update() {
        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;
    }
    void Example() {
        originalProjection = camera.projectionMatrix;
    }
}

import UnityEngine
import System.Collections

public class ExampleClass(MonoBehaviour):

	public originalProjection as Matrix4x4

	def Update() as void:
		p as Matrix4x4 = originalProjection
		p.m01 += (Mathf.Sin((Time.time * 1.2F)) * 0.1F)
		p.m10 += (Mathf.Sin((Time.time * 1.5F)) * 0.1F)
		camera.projectionMatrix = p

	def Example() as void:
		originalProjection = camera.projectionMatrix

	// Set an off-center projection, where perspective's vanishing
	// point is not necessarily in the center of the screen.
	//
	// left/right/top/bottom define near plane size, i.e.
	// how offset are corners of camera's near plane.
	// Tweak the values and you can see camera's frustum change.
	@script ExecuteInEditMode
	var left : float = -0.2;
	var right : float = 0.2;
	var top : float = 0.2;
	var bottom : float = -0.2;
	function LateUpdate () {
		var cam : Camera = camera;
		var m : Matrix4x4 = PerspectiveOffCenter(
			left, right, bottom, top,
			cam.nearClipPlane, cam.farClipPlane );
		cam.projectionMatrix = m;
	}
	static function PerspectiveOffCenter(
		left : float, right : float,
		bottom : float, top : float,
		near : float, far : float ) : Matrix4x4
	{        
		var x : float =  (2.0 * near) / (right - left);
		var y : float =  (2.0 * near) / (top - bottom);
		var a : float =  (right + left) / (right - left);
		var b : float =  (top + bottom) / (top - bottom);
		var c : float = -(far + near) / (far - near);
		var d : float = -(2.0 * far * near) / (far - near);
		var e : float = -1.0;
		var m : Matrix4x4 = new Matrix4x4();
		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;
	}

using UnityEngine;
using System.Collections;

[ExecuteInEditMode]
public class ExampleClass : 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 = new Matrix4x4();
        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;
    }
}

import UnityEngine
import System.Collections

[ExecuteInEditMode]
public class ExampleClass(MonoBehaviour):

	public left as float = (-0.2F)

	public right as float = 0.2F

	public top as float = 0.2F

	public bottom as float = (-0.2F)

	def LateUpdate() as void:
		cam as Camera = camera
		m as Matrix4x4 = PerspectiveOffCenter(left, right, bottom, top, cam.nearClipPlane, cam.farClipPlane)
		cam.projectionMatrix = m

	static def PerspectiveOffCenter(left as float, right as float, bottom as float, top as float, near as float, far as float) as Matrix4x4:
		x as float = ((2.0F * near) / (right - left))
		y as float = ((2.0F * near) / (top - bottom))
		a as float = ((right + left) / (right - left))
		b as float = ((top + bottom) / (top - bottom))
		c as float = ((-(far + near)) / (far - near))
		d as float = ((-((2.0F * far) * near)) / (far - near))
		e as float = (-1.0F)
		m as Matrix4x4 = Matrix4x4()
		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