{"topic":{"id":7265,"title":"2.2 渲染结果问题","slug":"topic","categoryId":56,"createdAt":"2023-11-15 13:44:11.496482","bumpedAt":"2023-11-17 10:55:43.227007","views":326,"postsCount":3,"highestPostNumber":3,"likeCount":0,"closed":true,"pinned":false,"pinnedGlobally":false,"pinnedAt":null,"pinnedUntil":null,"isBanner":false,"excerpt":"在高亮部分会出现黑色区域，经过排查 ambient,diffuse,specular 单独渲染出来的图片都是正确的，但是合成之后就会出现黑色部分。第一张图片是出现问题的图片，第二张是只用 specular 渲染出来的效果：","deletedAt":null,"isAnonymous":false,"category":{"id":56,"name":"计算机图形学","slug":"cg","color":"92278F"},"author":{"id":1518,"username":"Sigma","name":null,"avatarUrl":null},"tags":[]},"posts":[{"id":17177,"postNumber":1,"raw":"在高亮部分会出现黑色区域，经过排查 ambient,diffuse,specular 单独渲染出来的图片都是正确的，但是合成之后就会出现黑色部分。\n第一张图片是出现问题的图片，第二张是只用 specular 渲染出来的效果：\n[grid mode=\"tile\"]\n![(T$C(0LP2L@VTFI}Z76T2}J|634x500](/uploads/image/b8/40/b84005538f8943d51943228e582ac760a839de59fab2a0d370b0d1f18923f532.avif)\n![$Y6M)L1O}JTJ2V4D17`JI1|629x500](/uploads/image/bb/25/bb2596e665666fb520bdbf35e3fb91af534c2fc9db8692367df2bb63cd48833f.avif)\n[/grid]","cooked":"

在高亮部分会出现黑色区域，经过排查 ambient,diffuse,specular 单独渲染出来的图片都是正确的，但是合成之后就会出现黑色部分。
\n第一张图片是出现问题的图片，第二张是只用 specular 渲染出来的效果：

$\"(T$C(0LP2L@VTFI}Z76T2}J\"$
\n $\"$Y6M)L1O}JTJ2V4D17`JI1\"$

\n","createdAt":"2023-11-15 13:44:11.587962","updatedAt":"2023-11-16 02:47:46.472498","replyToPostNumber":null,"replyCount":0,"likeCount":0,"wordCount":82,"liked":false,"bookmarked":false,"polls":[],"reactions":[],"wiki":false,"version":2,"publicVersion":2,"deletedAt":null,"isAnonymous":false,"user":{"id":1518,"username":"Sigma","name":null,"avatarUrl":null,"admin":false,"moderator":false,"signatureRaw":null,"signatureCooked":null}},{"id":17201,"postNumber":2,"raw":"可能是 ambient,diffuse,specular 三个加起来的值太大，超过了 RGB 最大值 255，限制 frame_buf 里的颜色值最大为 255 即可","cooked":"

可能是 ambient,diffuse,specular 三个加起来的值太大，超过了 RGB 最大值 255，限制 frame_buf 里的颜色值最大为 255 即可

\n","createdAt":"2023-11-15 16:06:33.526005","updatedAt":"2023-11-15 16:06:33.526005","replyToPostNumber":null,"replyCount":0,"likeCount":0,"wordCount":36,"liked":false,"bookmarked":false,"polls":[],"reactions":[],"wiki":false,"version":1,"publicVersion":1,"deletedAt":null,"isAnonymous":false,"user":{"id":1557,"username":"geezmo","name":"geezmo","avatarUrl":"/uploads/image/1b/b9/1bb9ee525a8016277f4b08894f35ed820aed66de8a33260a2988097d811cb5a7.avif","admin":false,"moderator":false,"signatureRaw":null,"signatureCooked":null}},{"id":17343,"postNumber":3,"raw":"是的，着色的这三项如果加起来超过了 255，由于最后着色的时候采用的是无符号字符变量进行存储，会导致溢出，所以会出现黑色，所以像@geezmo 说的一样，截断即可","cooked":"

是的，着色的这三项如果加起来超过了 255，由于最后着色的时候采用的是无符号字符变量进行存储，会导致溢出，所以会出现黑色，所以像@geezmo 说的一样，截断即可

\n","createdAt":"2023-11-17 10:55:43.227007","updatedAt":"2023-11-17 10:55:43.227007","replyToPostNumber":null,"replyCount":0,"likeCount":0,"wordCount":70,"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":3,"hasUrlPostNumber":true}