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From Odwiki

i3dgen is the CommandLine renderer invoked by the 3DTextureGeneratorROP found in Outputs to generate i3d files. i3dgen can be executed from the commandline. i3dgen requires an Image3dShader to execute.

Example:

Given an Image3dShader:

  image3d sphere(float scale=1)
  {
     density = length(P);
  }

You can generate an i3d file called sphere.i3d by running

  % i3dgen -d 64 64 64 sphere.i3d  sphere scale .5

The resulting file will have a resolution of 64x64x64 voxels.