【Unity矩阵知识】之Matrix4x4矩阵变换详细实例

标题 ##博主最近研究矩阵的成果，简单的封装了一下，可直接当成工具类调用：

MatrixUtils工具类

internal  static class MatrixUtils 
{
    public static void Matrix4x4(this Transform transfrom,Matrix4x4 matrix4X4)
    {
        transfrom.localScale = matrix4X4.GetScale();
        transfrom.rotation = matrix4X4.GetRotation();
        transfrom.position = matrix4X4.GetPostion();
    }

    public static Quaternion GetRotation(this Matrix4x4 matrix4X4)
    {
        float qw = Mathf.Sqrt(1f + matrix4X4.m00 + matrix4X4.m11 + matrix4X4.m22)/2;
        float w = 4*qw;
        float qx = (matrix4X4.m21 - matrix4X4.m12)/w;
        float qy = (matrix4X4.m02 - matrix4X4.m20)/w;
        float qz = (matrix4X4.m10 - matrix4X4.m01)/w;
        return new Quaternion(qx, qy, qz, qw);
    }

    public static Vector3 GetPostion(this Matrix4x4 matrix4X4)
    {
        var x = matrix4X4.m03;
        var y = matrix4X4.m13;
        var z = matrix4X4.m23;
        return new Vector3(x,y,z);
    }

    public static Vector3 GetScale(this Matrix4x4 m)
    {
        var x = Mathf.Sqrt(m.m00*m.m00 + m.m01*m.m01 + m.m02*m.m02);
        var y = Mathf.Sqrt(m.m10*m.m10 + m.m11*m.m11 + m.m12*m.m12);
        var z = Mathf.Sqrt(m.m20*m.m20 + m.m21*m.m21 + m.m22*m.m22);
        return new Vector3(x,y,z);
    }
}

Matrix封装类

internal static class Matrix
{
    private static Matrix4x4 matrix;
    public static void Matrix4x4_Transfrom(this Transform transform, Vector3 targetPos)
    {
        matrix = Matrix4x4.identity;
        Vector4 v = new Vector4(transform.position.x, transform.position.y, transform.position.z, 1);

        matrix.m03 = targetPos.x;
        matrix.m13 = targetPos.y;
        matrix.m23 = targetPos.z;

        v = matrix * v;

        transform.Matrix4x4(matrix);
    }

    public static void Matrix4x4_Rotation(this Transform transform, EnemyManager.Axle axle, float angle)
    {
        matrix = Matrix4x4.identity;

        if (axle == EnemyManager.Axle.X)
        {
            matrix.m11 = Mathf.Cos(angle * Mathf.Deg2Rad);
            matrix.m12 = -Mathf.Sin(angle * Mathf.Deg2Rad);
            matrix.m21 = Mathf.Sin(angle * Mathf.Deg2Rad);
            matrix.m22 = Mathf.Cos(angle * Mathf.Deg2Rad);

        }
        else if (axle == EnemyManager.Axle.Y)
        {
            matrix.m00 = Mathf.Cos(angle * Mathf.Deg2Rad);
            matrix.m02 = Mathf.Sin(angle * Mathf.Deg2Rad);
            matrix.m20 = -Mathf.Sin(angle * Mathf.Deg2Rad);
            matrix.m22 = Mathf.Cos(angle * Mathf.Deg2Rad);
        }
        else
        {
            matrix.m00 = Mathf.Cos(angle * Mathf.Deg2Rad);
            matrix.m01 = -Mathf.Sin(angle * Mathf.Deg2Rad);
            matrix.m10 = Mathf.Sin(angle * Mathf.Deg2Rad);
            matrix.m11 = Mathf.Cos(angle * Mathf.Deg2Rad);
        }

        transform.Matrix4x4(matrix);
    }

    public static void Matrix4x4_Scale(this Transform transform, Vector3 targetScale)
    {
        matrix = Matrix4x4.identity;
        Vector4 v = new Vector4(transform.localScale.x, transform.localScale.y, transform.localScale.z, 1);

        matrix.m00 = targetScale.x;
        matrix.m11 = targetScale.y;
        matrix.m22 = targetScale.z;
        v = matrix * v;
        transform.Matrix4x4(matrix);
    }
}

测试调用（直接挂载对象）：

public  class Test :MonoBehaviour
{
    void Start()
    {
        transform.Matrix4x4_Rotation(EnemyManager.Axle.X, 90f);//旋转
        transform.Matrix4x4_Scale(new Vector3(2,2,2));//缩放
        transform.Matrix4x4_Transfrom(new Vector3(6,6,6));//位移
    }

}

打印数据如下：



参考：