choose a sandbox // sandbox.threejs.hofk.de/
see GitHub github.com/hofk

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Sandbox THREEf - see also the form library
- create geometry with functions / - uses cylinder coordinates / - based on basic form cylinder

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Sandbox THREEp - see also the form library
- create geometry with functions / - uses spherical coordinates / - based on two hemispheres

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Sandbox THREEg
- creates various types of extended geometry / generates indexed or non-indexed BufferGeometry.
Magic Box, Magic Sphere, Labyrinth-3D-2D, Custom Line Grid,
Profiled Contour Geometry, Road/Wall

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Sandbox THREEi
- creates geometries for implicit surfaces
- creates forms with holes that can be used for inner geometries
- generates indexed BufferGeometry
- uses a triangulation algorithm of E. Hartmann