[英]What is Point4D used for in WPF 3D?
Point4D与Point3D的正常用例是什么?
它是用于处理特殊的几何图形,还是仅将标量字段值携带在该点附近或更专业的东西?
为了表示3D 仿射变换 ,除了缩放和旋转外,还可能需要平移作为矩阵变换,您需要扩展到4D点和4x4增强矩阵。 (考虑到3x3矩阵无法将点(0,0,0)转换到其他位置。)
在WPF中, Matrix3D结构表示4x4矩阵,而Point4D是可以与Matrix3D矩阵相乘的增强矢量结构。 扩展的矢量有时称为“ 齐次3D坐标 ”。
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