a technique for generating an image by tracing the path of light through pixels in an image plane and simulating the effects of its encounters with virtual objects

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A simple “beam tracing” simulation

I am trying to implement a simple beam tracing simulation. Basically it models the path of a beam within a pipe: In the picture, the beam starts emitting from p1, hitting the boundary at p2 and ...
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Ray-Triangle Intersection Detection using Barycentric Coordinates

I am attempting to convert the algorithm from http://www.cbloom.com/3d/techdocs/fast_ray_tri.txt to java code, but my solution does not function correctly. The only intentional change I made was for ...