Content involving Three.js Meshes and Geometries

I'm a beginner in Three.js and I was wondering if there is a way to extract separate elements or shells from a Mesh or Geometry object?

If there isn't a built-in method for this, how might one go about creating a function to identify and detach unconnected faces into their own individual Mesh objects?

Context: I am working on loading a 3D model and want to combine parts of it using ThreeBSP. To do so, I first need to split the objects before performing any boolean operations.

Appreciate any guidance on this matter

javascriptthree.js3d-modellingcsg

Answer №1

Explore the Geometry object further. It contains an array of faces. There doesn't seem to be a built-in method for determining which faces are contiguous.

To simplify, in this context, "contiguous" means faces that share points with other faces that also share points with additional faces and so on. Start by selecting a face. Save its defining points, identify any faces using those same points, save their points, find all faces sharing any of the new points, and continue this process recursively. Look into the concept of "Flood Fill" for guidance on utilizing recursion and managing bookkeeping to prevent endless looping due to duplicate searches.

Best of luck!

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