Tetrahedral wavefront construction (WF) raytracing. There are four layers, including a lens, but here only layer 2 is shown. The yellow one is the wavefront at a certain time. The blue one is the travel time table at the surface. We shoot the ray upward.
Again, this is a constant medium raytracing, the red wavefront is a perfect sphere.
This is another 3 layered model example with many wavefronts.
This is a constant velocity example with reflections and many wavefronts.
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