Matrix4x4.inverse

Description

The inverse of this matrix (Read Only).

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

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.

using UnityEngine;

public class ExampleScript : MonoBehaviour
{
    // Stretch a mesh at an arbitrary angle around the X axis.

    // Angle and amount of stretching.
    float rotAngle;
    float stretch;


    private MeshFilter mf;
    private Vector3[] origVerts;
    private Vector3[] newVerts;


    void 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];
    }


    void Update()
    {
        // Create a rotation matrix from a Quaternion.
        Quaternion rot = Quaternion.Euler(rotAngle, 0, 0);
        Matrix4x4 m = Matrix4x4.TRS(Vector3.zero, rot, Vector3.one);

        // Get the inverse of the matrix (ie, to undo the rotation).
        Matrix4x4 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.
            Vector3 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;
    }
}