{"topic":{"id":7511,"title":"实验 2.4 中 cast_ray（）函数","slug":"topic","userId":1518,"categoryId":56,"createdAt":"2023-11-23 14:32:51.720894","bumpedAt":"2023-11-23 15:34:40.505649","views":240,"postsCount":2,"highestPostNumber":2,"likeCount":0,"closed":true,"pinned":false,"pinnedGlobally":false,"pinnedAt":null,"pinnedUntil":null,"isBanner":false,"excerpt":"实验 2.4 中，在 cast_ray（）函数里要调用之前写好的 fresnel() 函数，那 fresnel() 函数的第三个参数 ior 从哪里找呀😭","deletedAt":null,"isAnonymous":false,"isPrivate":false,"isMembersOnly":false,"category":{"id":56,"name":"计算机图形学","slug":"cg","color":"92278F"},"author":{"id":1518,"username":"Sigma","name":null,"avatarUrl":null},"realAuthor":{"id":1518,"username":"Sigma","name":null,"avatarUrl":null},"tags":[]},"posts":[{"id":17900,"postNumber":1,"raw":"实验 2.4 中，在 cast_ray（）函数里要调用之前写好的 fresnel() 函数，那 fresnel() 函数的第三个参数 ior 从哪里找呀😭\n[grid mode=\"tile\"]\n![image|690x59](/uploads/image/b2/7a/b27abd700ad389f8f7da2f591759d5cb5d24f00d9c64526933852f8dc2255b12.avif)\n![image|690x110](/uploads/image/66/bb/66bbcc39db1230eaaf0dc770e897efaa9fa2a412a55df42a8acac3c180cfb01b.avif)\n[/grid]","cooked":"

实验 2.4 中，在 cast_ray（）函数里要调用之前写好的 fresnel() 函数，那 fresnel() 函数的第三个参数 ior 从哪里找呀😭

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\n","createdAt":"2023-11-23 14:32:52.370923","updatedAt":"2023-11-25 12:55:47.884758","replyToPostNumber":null,"replyCount":0,"likeCount":0,"wordCount":44,"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":17903,"postNumber":2,"raw":"可以自己设置一个，比如玻璃的折射率","cooked":"

可以自己设置一个，比如玻璃的折射率

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