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原来的代码是这样的:
float x = (2 * (i + 0.5 ) / (float)scene.width - 1) * imageAspectRatio * scale; float y = (1 - 2 * (j + 0.5) / (float)scene.height) * scale;真的很简单，把下面代码中的
0.5改成get_random_float()float x = (2 * (i + get_random_float() ) / (float)scene.width - 1) * imageAspectRatio * scale; float y = (1 - 2 * (j + get_random_float()) / (float)scene.height) * scale;原来的代码是在像素的中心点采样的，现在我们在整个像素中随机采样，思路类似SSAA, 得益于spp的存在，都不用多加一层循环了。
现在锯齿是没有了，但是不可避免的出现毛边，一开始我还以是因为spp不够，拉到512，边依然是毛糙的。
我的EPSILON = 0.01，测试下来好像与epsilon无关。
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修改起来很方便，把xy以及射线的生成挪到spp循环内部就行了，这样可以节省一次循环
for (int k = 0; k < spp; k++){ //generate primary ray direction float x = (2 * (i + get_random_float()) / (float)scene.width - 1) * imageAspectRatio * scale; float y = (1 - 2 * (j + get_random_float()) / (float)scene.height) * scale; Vector3f dir = normalize(Vector3f(-x, y, 1)); auto index = j*scene.width + i; framebuffer[index] += scene.castRay(Ray(eye_pos, dir), 0) / spp; }在低spp情况下也能获取不错的效果
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