{"topic":{"id":6508,"title":"实验 2.2，draw() 函数中的顶点坐标问题","slug":"topic","userId":1525,"categoryId":56,"createdAt":"2023-10-15 12:37:47.668338","bumpedAt":"2023-10-17 01:24:59.054649","views":346,"postsCount":2,"highestPostNumber":2,"likeCount":0,"closed":true,"pinned":false,"pinnedGlobally":false,"pinnedAt":null,"pinnedUntil":null,"isBanner":false,"excerpt":"注释中说要把顶点坐标变换到世界空间：但是在开发者文档中说顶点是世界坐标所以到底要不要变换？如果要变换，三角形所在的对象坐标系相对于世界坐标系的位置在哪啊","deletedAt":null,"isAnonymous":false,"isPrivate":false,"isMembersOnly":false,"category":{"id":56,"name":"计算机图形学","slug":"cg","color":"92278F"},"author":{"id":1525,"username":"222333","name":"Hadeon","avatarUrl":null},"realAuthor":{"id":1525,"username":"222333","name":"Hadeon","avatarUrl":null},"tags":[]},"posts":[{"id":13884,"postNumber":1,"raw":"注释中说要把顶点坐标变换到世界空间：\n![Screenshot from 2023-10-15 20-33-49|662x109](/uploads/image/89/06/8906d3fff370dba40218d3c3016f62e52c4322ec61a143c53d0a4c0cdcee37af.avif)\n但是在 [开发者文档](https://dandelion-docs.readthedocs.io/zh_CN/latest/d2/d51/classTriangle.html#a3f3bbd24c7501750c607875d0a34c97a) 中说顶点是世界坐标\n![Screenshot from 2023-10-15 20-35-41|670x195](/uploads/image/cb/76/cb760211090c63e408a43b8f738c71513b5e42d16b08b430d1e97dfe0f78b2bb.avif)\n所以到底要不要变换？如果要变换，三角形所在的对象坐标系相对于世界坐标系的位置在哪啊","cooked":"

注释中说要把顶点坐标变换到世界空间：
\n $\"Screenshot$
\n但是在开发者文档中说顶点是世界坐标
\n $\"Screenshot$
\n所以到底要不要变换？如果要变换，三角形所在的对象坐标系相对于世界坐标系的位置在哪啊

\n","createdAt":"2023-10-15 12:37:47.74889","updatedAt":"2023-10-16 03:49:15.625025","replyToPostNumber":null,"replyCount":0,"likeCount":0,"wordCount":86,"liked":false,"bookmarked":false,"polls":[],"reactions":[],"wiki":false,"version":2,"publicVersion":2,"deletedAt":null,"isAnonymous":false,"user":{"id":1525,"username":"222333","name":"Hadeon","avatarUrl":null,"admin":false,"moderator":false,"signatureRaw":null,"signatureCooked":null}},{"id":14023,"postNumber":2,"raw":"需要变换。三角形原本所在的坐标系为该面片所在 mesh 的模型坐标系。即需要左乘一个 model 矩阵才能获得世界坐标系坐标","cooked":"

需要变换。三角形原本所在的坐标系为该面片所在 mesh 的模型坐标系。即需要左乘一个 model 矩阵才能获得世界坐标系坐标

\n","createdAt":"2023-10-17 01:24:59.054649","updatedAt":"2023-10-17 01:24:59.054649","replyToPostNumber":null,"replyCount":0,"likeCount":0,"wordCount":51,"liked":false,"bookmarked":false,"polls":[],"reactions":[],"wiki":false,"version":1,"publicVersion":1,"deletedAt":null,"isAnonymous":false,"user":{"id":1488,"username":"roland","name":"李昌洲","avatarUrl":null,"admin":false,"moderator":false,"signatureRaw":null,"signatureCooked":null}}],"hasMore":false,"lastReadPostNumber":1,"hasUrlPostNumber":false}