/// <summary>
/// 世界空间到观察空间变换对比
/// 这里是透视相机，没有做正交相机的
/// </summary>
void TestWorldSpaceToViewSpace()
{
//注意这里是透视相机，没有做正交相机变换矩阵
cam = Camera.main;
//世界空间坐标到观察空间坐标
Vector3 viewPos = TransformationMatrixUtil.WToVPosition(trans1.position);
//结果是z轴相反，因为世界空间是左手坐标系，而观察空间是右手坐标系
Debug.LogFormat("世界空间:{0},观察空间:{1}", trans1.position, viewPos);
//世界空间到观察空间
Matrix4x4 matrix = TransformationMatrixUtil.WToVMatrix();
Debug.LogFormat("matrix:\n{0}\n\n worldToCameraMatrix:\n{1}\n\n是否相等：{2}", matrix, cam.worldToCameraMatrix, matrix == cam.worldToCameraMatrix);
}
/// <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);
}
