/// <summary>
/// 测试模型空间到屏幕空间的变换
/// 只验证 屏幕坐标xy，不验证zw
/// 注意这里是透视相机，没有做正交相机变换矩阵
/// </summary>
void TestModelSpaceToScreenSpace()
{
Transform _parent = trans1.parent;
//模型空间转世界空间
Vector3 worldPos = TransformationMatrixUtil.MToWPosition(_parent.localScale, _parent.localEulerAngles, _parent.localPosition, trans1.localPosition);
//世界空间转观察空间
Vector3 viewPos = TransformationMatrixUtil.WToVPosition(worldPos);
//观察空间转透视裁剪空间
Vector4 clipPos = TransformationMatrixUtil.VToPPosition(viewPos);
//裁剪空间到屏幕空间变换
Vector4 screenPos = TransformationMatrixUtil.PToScreenPosition(clipPos);
Vector4 screenPos1 = cam.WorldToScreenPoint(trans1.position);
//Vector4 viewportPos = cam.WorldToViewportPoint(trans1.position);
Debug.LogFormat(" worldPos:{0},trans1.positon:{1}\n viewPos:{2}\n clipPos:{3}\n screenPos:{4},screenPos1:{5}", worldPos, trans1.position, viewPos, clipPos, screenPos, screenPos1);
}
