作业三，光照模型和问题

[偏偏123456]

phong_fragment_shader 光照模型

Eigen::Vector3f light_dir = light.position – point;
Eigen::Vector3f view_dir = eye_pos – point;
float r = light_dir.dot(light_dir);
// ambient
Eigen::Vector3f La = ka.cwiseProduct(amb_light_intensity);
// diffuse
Eigen::Vector3f Ld = kd.cwiseProduct(light.intensity / r);
Ld *= std::max(0.0f, normal.normalized().dot(light_dir.normalized()));

Eigen::Vector3f h = (light_dir + view_dir).normalized();

Eigen::Vector3f Ls = ks.cwiseProduct(light.intensity / r);
Ls *= std::pow(std::max(0.0f, normal.normalized().dot(h)), p);
result_color += (La + Ld + Ls);

有个问题：结果变成了黑白小牛，从光栅化的角度来讲。

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[偏偏123456]

使用normal_fragment_shader 的情况

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[偏偏123456]

是不是光栅化还是有问题你，因为同样的光栅化方法，normal_fragment_shader 可以正确显示。可能是哪块除了问题，应该从哪个角度考虑解决方法呢。

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[cggg]

light_dir , view_dir 都应该单位化，公式里面的几个向量都是单位向量。

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[cggg]

(light_dir + view_dir).normalized(); 应该先单位化，否则结果错误。

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[偏偏123456]

@cggg 谢谢~

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