This ray tracing example shows area lighting, reflection, refraction, and how to load existing 3D models (the diamond).
By default, it outputs a grainy low-resolution rendering (which takes about a minute):
Raising the quality and resolution is as simple as modifying these lines:
MaxDepth: 5,
NumSamples: 400,and this line:
img := render3d.NewImage(200, 200)Simply increase MaxDepth to maybe 15, increase NumSamples to 20000, and increase the resolution from 200x200 to whatever you want. Here's an example HD rendering at 500x500:
