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You must run a server that to serve the index.html, tex/ and shaders/ files

The simplest way is to use the python builtin http server

   # In the root of this project folder run
   python -m http.server

After this, open localhost:8000 (or whatever port is is opened) in a browser

Lens Parameters:

• Radius of curvature of each surface
• Diameter of lens
• Thickness of glass
• Position of lens (XYZ)

The whole project is rendered using multiple passes (one for each lens), this is set up in app.js so that first the scene is rendered, then each lens distorts the scene, outputting a new texture that is fed to the next lens.

The lens distortion fragment shader (shaders/lens.frag.glsl) uses a restricted form of raytracing to simulate how the path of light to the camera is distorted by refraction through the lens, including different refractive indices for the different color components of light.