Question

JavaScript => public var inverse: Matrix4x4;
C# => public Matrix4x4 inverse;;

Description 描述

The inverse of this matrix (Read Only).

相反的矩阵(只读)。

Inverted matrix is such that if multiplied by the original would result in identity matrix.

逆矩阵是指如果乘以原有的矩阵将会得到单位矩阵。

If some matrix transforms vectors in a particular way, then the inverse matrix can transform them back. For example, Transform's worldToLocalMatrix and localToWorldMatrix are inverses of each other.

如果某些矩阵变换向量在特别的方法中，那么逆矩阵可以变换到他们的背后。例如，对象的世界坐标转本地坐标矩阵和自身转世界坐标矩阵是彼此相反的。

JavaScript:

 // Stretch a mesh at an arbitrary angle around the X axis.
 
	// Angle and amount of stretching.
	var rotAngle: float;
	var stretch: float;
 
 
	private var mf: MeshFilter;
	private var origVerts: Vector3[];
	private var newVerts: Vector3[];
 
 
	function Start () {
		// Get the Mesh Filter component, save its original vertices
		// and make a new vertex array for processing.
		mf = GetComponent.<MeshFilter>();
		origVerts = mf.mesh.vertices;
		newVerts = new Vector3[origVerts.Length];
	}
 
 
	function Update () {
		// Create a rotation matrix from a Quaternion.
		var rot = Quaternion.Euler(rotAngle, 0, 0);
		var m = Matrix4x4.TRS(Vector3.zero, rot, Vector3.one);
 
		// Get the inverse of the matrix (ie, to undo the rotation).
		var inv = m.inverse;
 
		// For each vertex...
		for (var i = 0; i < origVerts.Length; i++) {
			// Rotate the vertex and scale it along its new Y axis.
			var pt = m.MultiplyPoint3x4(origVerts[i]);
			pt.y *= stretch;
 
			// Return the vertex to its original rotation (but with the
			// scaling still applied).
			newVerts[i] = inv.MultiplyPoint3x4(pt);
		}
 
		// Copy the transformed vertices back to the mesh.
		mf.mesh.vertices = newVerts;
	}    

C#:

using UnityEngine;
using System.Collections;
 
public class ExampleClass : MonoBehaviour {
    public float rotAngle;
    public float stretch;
    private MeshFilter mf;
    private Vector3[] origVerts;
    private Vector3[] newVerts;
    void Start() {
        mf = GetComponent<MeshFilter>();
        origVerts = mf.mesh.vertices;
        newVerts = new Vector3[origVerts.Length];
    }
    void Update() {
        Quaternion rot = Quaternion.Euler(rotAngle, 0, 0);
        Matrix4x4 m = Matrix4x4.TRS(Vector3.zero, rot, Vector3.one);
        Matrix4x4 inv = m.inverse;
        int i = 0;
        while (i < origVerts.Length) {
            Vector3 pt = m.MultiplyPoint3x4(origVerts[i]);
            pt.y *= stretch;
            newVerts[i] = inv.MultiplyPoint3x4(pt);
            i++;
        }
        mf.mesh.vertices = newVerts;
    }
}

matrix4x4