作业3更正公告

[助教]

各位同学，非常抱歉！
由于我的疏忽，作业3框架中存在一些较为明显的问题。
现在我已经更正了代码框架中的问题，并且相应地调整了文档，请所有同学在更正后的版本上继续完成作业。
⚠️请注意作业提交格式要求，本次作业提交格式不合要求的话，将会被扣除一定的分数。

我们同样在多处发布了作业框架，请大家根据网络环境自行选择
清华云盘链接：https://cloud.tsinghua.edu.cn/f/324634252f4a47578062/?dl=1
smartchair: http://www.smartchair.org/general_file_upload/serve/Hw3.zip?f_key=AMIfv95i9nBv3Uf1h8xqjK4LIK8T9DcLi4x0bxruE1gmbPRy5SUCAhG-6Pvwbet2J08kVaw80yqRhF-_AuOvGxZFA8gPTnEDk1E00C4eAu6Ujp22J2xprRkOGx4zNtZN-z8VBS-D5phswYYwTqIDpadyxfB1D6ruHzu0QUPUTuCp8YWp3bpve9pttZeM8gtZ1XTf0WDRNoaqwv1o1CjCgsDcSd4Ni5s9qEdlWd4HfJMzyZCdXteEqqox6IEm_Kau_iMZhedTm_Hv99esET-XKzFcik-K7xiZU22tyYCRNNxP5cu58PHqf1VIA5_Osok3zIIIItQNWGKL

• This topic was modified 4 years, 1 month ago by 助教.
• This topic was modified 4 years, 1 month ago by ChenLinghao(技术秘书).
• This topic was modified 4 years, 1 month ago by 助教.
• This topic was modified 4 years, 1 month ago by 助教.
• This topic was modified 4 years, 1 month ago by 助教.
• This topic was modified 4 years, 1 month ago by 助教.
• This topic was modified 4 years, 1 month ago by 助教.
• This topic was modified 4 years, 1 month ago by 助教.
• This topic was modified 4 years, 1 month ago by 助教.
• This topic was modified 4 years, 1 month ago by 助教.
• This topic was modified 4 years, 1 month ago by 助教.

[助教]

⚠️⚠️⚠️作业三常见问题集合：
(1) bump mapping 部分的 h(u,v)=texture_color(u,v).norm, 其中 u,v 是 tex_coords, w,h 是 texture 的宽度与高度
(2) rasterizer.cpp 中 v = t.toVector4()
(3) get_projection_matrix 中的 eye_fov 应该被转化为弧度制
(4) bump 与 displacement 中修改后的 normal 仍需要 normalize
(5) 可能用到的 eigen 方法：norm(), normalized(), cwiseProduct()
(6) 实现 h(u+1/w,v) 的时候要写成 h(u+1.0/w,v)
(7) 正规的凹凸纹理应该是只有一维参量的灰度图，而本课程为了框架使用的简便性而使用了一张 RGB 图作为凹凸纹理的贴图，因此需要指定一种规则将彩色投影到灰度，而我只是「恰好」选择了 norm 而已。为了确保你们的结果与我一致，我才要求你们都使用 norm 作为计算方法。
(8) bump mapping & displacement mapping 的计算的推导日后将会在光线追踪部分详细介绍，目前请按照注释实现。

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• This reply was modified 4 years, 1 month ago by 助教.
• This reply was modified 4 years, 1 month ago by 助教.
• This reply was modified 4 years, 1 month ago by 助教.
• This reply was modified 4 years, 1 month ago by 助教.
• This reply was modified 4 years, 1 month ago by 助教.
• This reply was modified 4 years, 1 month ago by 助教.
• This reply was modified 4 years, 1 month ago by 助教.

[Angus]

(2) rasterizer.cpp 中 v = t.toVector4()
助教，关于这一条，我测试了一下
auto v = t.toVector4()
v[i].w() 恒为1,并不是所需的 view space 的深度值
这里是不是得用t.v[i].w()才可?

[AlphaFrog]

+1

[輕山柒海]

虽然已经隔了两年多，但是还是给后来者指个路。
《GAMES101》作业框架问题详解

[gsma823]

在知乎刷到过，很牛

[dzy]

这问题集合看不懂啊,有大佬解释下吗

[砸锅卖铁]

Bump的图片好像找不到，得到argc条件判断的时候再次赋值才能找到

[waqia]

bump map 和 displacement map有详细讲解吗？感觉作业里面的做法不对啊

[fgrain]

为什么rasterizer.cpp 中 v = t.toVector4()

std::array<Vector4f, 3> Triangle::toVector4() const
{
std::array<Vector4f, 3> res;
std::transform(std::begin(v), std::end(v), res.begin(), [](auto& vec) { return Vector4f(vec.x(), vec.y(), vec.z(), 1.f); });
return res;
}
这里不是把v.w()设为1了吗，不是深度值啊

[如果是我DJ你会爱我吗]

惊奇的发现，很多上个作业我自定义的函数这个框架居然一模一样地写出来了

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