本文探讨了SphereTracing算法，一种通过沿像素方向搜索并根据 signed distance 值寻找表面的几何方法，用于深度渲染隐式 signed distance 函数，特别是在抗锯齿 ray tracing 中的应用。
sphere tracing algorithm [14], which marches along each pixel’s ray direction with the queried signed distance until the ray hits the surface, i.e., the signed distance equals to zero (Fig. 2).
where rays are shot from the camera pinhole along the direction of each pixel to search
for the surface level set according to the signed distance value.
Sphere Tracing: A Geometric Method for the Antialiased Ray Tracing of Implicit
Surfaces
DIST: Rendering Deep Implicit Signed Distance Function with Differentiable Sphere Tracing
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