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Shadow rays in Raytracing - Computer Graphics Stack …
https://computergraphics.stackexchange.com/questions/1734/shadow-rays-in-raytracing
In a one-hit tracer, you can't fix that problem by simply discarding the intersection, because you still don't know whether the shadow ray would have intersected another object further along. To avoid self-intersections, you need to push the start point of the ray along its direction by epsilon:
raytracing - Ray Tracing Shadows: The Shadow Line …
https://computergraphics.stackexchange.com/questions/4986/ray-tracing-shadows-the-shadow-line-artifact
A nasty artifact that can happen when casting shadow rays is the Shadow Line Artifact. Since shadow rays originate from a certain position and don't usually take the normal into account, a complete face on a smooth object will either be shadowed or not, revealing the hard edges again: The shadow is, so to speak, 'correct' and the weird appearance results from the normal map …
3d - Ray tracing: Problems with Shadow Rays Output
https://stackoverflow.com/questions/53468139/ray-tracing-problems-with-shadow-rays-output
Ray tracing: Problems with Shadow Rays Output. Ask Question Asked 3 years, 4 months ago. Modified 3 years, 4 months ago. Viewed 681 times 2 0. Before this is tagged as a duplicate, I am having the exact same problem as the individual who asked this question. Unfortunately, it doesn't have an answer that helped at all, so hopefully this will ...
Introduction to Ray Tracing: a Simple Method for Creating …
https://www.scratchapixel.com/lessons/3d-basic-rendering/introduction-to-ray-tracing/implementing-the-raytracing-algorithm
Writing a Basic Ray Tracer. Source Code. Figure 1: we shoot a primary ray through the center of the pixel to check for a possible object intersection. When we find one we then cast a shadow ray to find out if the point is illuminated or in shadow. Figure 2: the small sphere cast a …
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