[英]What is Point4D used for in WPF 3D?
Point4D與Point3D的正常用例是什么?
它是用於處理特殊的幾何圖形,還是僅將標量字段值攜帶在該點附近或更專業的東西?
為了表示3D 仿射變換 ,除了縮放和旋轉外,還可能需要平移作為矩陣變換,您需要擴展到4D點和4x4增強矩陣。 (考慮到3x3矩陣無法將點(0,0,0)轉換到其他位置。)
在WPF中, Matrix3D結構表示4x4矩陣,而Point4D是可以與Matrix3D矩陣相乘的增強矢量結構。 擴展的矢量有時稱為“ 齊次3D坐標 ”。
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