如何在中心XNA处旋转3D立方体？

Question

我尝试从中心而不是边缘旋转3D立方体.这是我使用的代码.

public rotatemyCube()
{
    ...
    Matrix newTransform = Matrix.CreateScale(scale) * Matrix.CreateRotationY(rotationLoot) * Matrix.CreateTranslation(translation);
    my3Dcube.Transform = newTransform;
    ....


public void updateRotateCube()
{
    rotationLoot += 0.01f;
}

我的立方体旋转很好,但不是从中心旋转.这是一个解释我的问题的示意图.

我需要这个:

我的完整代码

private void updateMatriceCubeToRotate()
    {
        foreach (List<instancedModel> ListInstance in listStructureInstance)
        {
            foreach (instancedModel instanceLoot in ListInstance)
            {
                if (my3Dcube.IsAloot)
                {

                    Vector3 scale;
                    Quaternion rotation;
                    Vector3 translation;
                    //I get the position, rotation, scale of my cube
                    my3Dcube.Transform.Decompose(out scale,out rotation,out translation);


                    var rotationCenter = new Vector3(0.1f, 0.1f, 0.1f);

                    //Create new transformation with new rotation
                    Matrix transformation =
                        Matrix.CreateTranslation(- rotationCenter)
                        * Matrix.CreateScale(scale)
                        * Matrix.CreateRotationY(rotationLoot)
                        * Matrix.CreateTranslation( translation);

                    my3Dcube.Transform = transformation;


                }
            }
        }
        //Incremente rotation 
        rotationLoot += 0.05f;
    }

Answer 1

旋转矩阵围绕坐标系的原点旋转顶点.为了绕某一点旋转,你必须使它成为原点.这可以通过简单地从形状中的每个顶点减去旋转点来完成.

var rotationCenter = new Vector3(0.5f, 0.5f, 0.5f);

Matrix transformation = Matrix.CreateTranslation(-rotationCenter)
    * Matrix.CreateScale(scaling) 
    * Matrix.CreateRotationY(rotation) 
    * Matrix.CreateTranslation(position);