作业7发布公告

[助教]

大家好，GAMES101课程的作业7现在发布。

我们在games, smartchair放了两份完全相同的备份，请大家根据网络环境自行选择下载途径。

这次作业的截止时间是北京时间4月21日晚上23:59.

注意：本次作业难度不低，且运行时间较长，请尽早开始完成。

games的作业7链接

smartchair的作业7链接

• This topic was modified 4 years ago by 助教.
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[助教]

本层楼将用于持续更新可能普遍存在的问题，遇到困难时请首先查阅本楼寻找相似问题！

1、如果出现 http://games-cn.org/forums/topic/zuoyeqiguangxianxiangjiaoceshiyichang/ 所描述的部分平面相交被判定为 MISS 的问题，请注意判定 Bounding Box 与 Ray 相交时的边界是 t_enter <= t_exit，而不是 t_enter < t_exit. 此外，你还需要注意此判断的精度问题。

2、如果出现 http://games-cn.org/forums/topic/zuoyeqixuanrandejieguotaian/ 所描述的渲染结果较暗，出现横向黑色条纹的情况，很可能是因为直接光部分由于精度问题，被错误判断为遮挡，请试着通过精度调整放宽相交限制。


3、注意本框架中直接光部分 Intersection.emit 是采样得到的光源的 emission （Li），Vector3f.norm() 返回的是向量的长度而非长度平方。

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[liyuan]

求问 现在还有作业讨论群嘛？想问个问题 渲染结果 看不到color bleeding

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[acticn]

global.hpp下的get_random_float()随机数生成函数存在问题。
会导致在重复调用该函数时，返回同一个值。

我的解决方案是把其中定义的dev，rng，dist在main.cpp中定义为全局变量。
修改后的main.cpp和global.hpp在附件中。

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[Linyan]

感谢，之前一直不对，花了两个小时没看出任何毛病，换成这个就好了。。。还贼快orz

[ViXbob]

十分感谢，修改之后速度快了几十倍 ORZ

另外，其实直接在三个变量的定义前面加上static关键字就可以了。

This post has received 1 vote up.

[Author]

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