{"id":9693,"date":"2022-04-09T01:11:31","date_gmt":"2022-04-08T22:11:31","guid":{"rendered":"https:\/\/arabgamedev.com\/?post_type=docs&p=9693"},"modified":"2022-05-13T11:49:34","modified_gmt":"2022-05-13T08:49:34","password":"","slug":"%d8%aa%d9%86%d8%b3%d9%8a%d9%82-%d9%85%d8%b5%d8%b7%d9%84%d8%ad%d8%a7%d8%aa-%d8%a7%d9%84%d9%81%d8%b6%d8%a7%d8%a1","status":"publish","type":"docs","link":"https:\/\/arabgamedev.com\/en\/docs\/%d8%aa%d9%86%d8%b3%d9%8a%d9%82-%d9%85%d8%b5%d8%b7%d9%84%d8%ad%d8%a7%d8%aa-%d8%a7%d9%84%d9%81%d8%b6%d8%a7%d8%a1\/","title":{"rendered":"Coordinate Space Terminology"},"content":{"rendered":"

Spaces<\/h2>\n\n\n\n\n<\/colgroup>\n\n\n\n\n\n\n\n
\u00a0<\/caption>\n
Space in Unreal<\/th>\nOther Names<\/th>\nDescription<\/th>\n<\/tr>\n<\/thead>\n
Tangent<\/strong><\/td>\n<\/td>\nOrthogonal (although interpolation can introduce skew); can be left-handed or right-handed. TangentToLocal contains rotation only, so it is orthonormal and can be inverted by transposition.<\/td>\n<\/tr>\n
Local<\/strong><\/td>\nObject Space<\/strong><\/td>\nOrthogonal; can be left-handed or right-handed, requiring triangle culling order to be adjusted. LocalToWorld contains rotation, non-uniform scale (including negative non-uniform scale that can change winding order), and translation.<\/td>\n<\/tr>\n
World<\/strong><\/td>\n<\/td>\nWorldToView contains rotation and translation only, so distances in View Space are the same as in World Space.<\/td>\n<\/tr>\n
TranslatedWorld<\/strong><\/td>\n<\/td>\n\n
\n\n\n\n<\/colgroup>\n<\/thead>\n\n\n\n\n\n\n
\u00a0<\/caption>\n
World<\/td>\nTranslatedWorld \u2212 PreViewTranslation<\/td>\n<\/tr>\n
TranslatedWorld<\/td>\nWorld + PreViewTranslation<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n

Translated matrices remove the camera position from combined transformation matrices, improving precision when transforming vertices.<\/td>\n<\/tr>\n

View<\/strong><\/td>\nCameraSpace<\/strong><\/td>\nViewToClip scales x and y but does not translate them, which would create an off-center projection. It scales and translates z, and applies projection to produce homogeneous Clip Space.<\/td>\n<\/tr>\n
Clip<\/strong><\/td>\nHomogeneous\u00a0<\/strong>coordinates<\/strong>\u00a0, post-projection space, or\u00a0projection space<\/strong><\/td>\nAfter applying the perspective projection matrix. W in Clip Space is the same as Z in View Space.<\/td>\n<\/tr>\n
Screen<\/strong><\/td>\nNormalizedDeviceCoordinates<\/strong>\u00a0in OpenGL<\/td>\nAfter the perspective divide:<\/p>\n
\n\n\n\n<\/colgroup>\n<\/thead>\n\n\n\n\n\n
\u00a0<\/caption>\n
Left \/ Right<\/td>\n\u22121, 1<\/td>\n<\/tr>\n
Bottom \/ Top<\/td>\n1, \u22121<\/td>\n<\/tr>\n
Near \/ Far<\/td>\n0, 1 (OpenGL RHI must convert this to \u22121, 1)<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/td>\n<\/tr>\n
Viewport<\/strong><\/td>\nViewportCoordinates<\/strong>\u00a0,\u00a0WindowCoordinates<\/strong><\/td>\nIn pixels:<\/p>\n
\n\n\n\n<\/colgroup>\n<\/thead>\n\n\n\n
\u00a0<\/caption>\n
Left \/ Right<\/td>\n0, width \u2212 1<\/td>\n<\/tr>\n
Bottom \/ Top<\/td>\n0, height \u2212 1<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

Space Transformations<\/h2>\n

Name transformations between spaces using XTo\u00a0Y.<\/em><\/strong><\/p>\n

Examples:<\/strong><\/p>\n

    \n
  • WorldToView<\/li>\n
  • TranslatedWorldToView<\/li>\n
  • TangentToWorld<\/li>\n<\/ul>","protected":false},"excerpt":{"rendered":"

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