What is the best approach to converting a set of vertex indices greater than four into a usable format?

I am developing a method to transform the data from 3D files into THREE geometries. The data is formatted as follows:

{"N":"name of the block","V":[[0,1,2]..[N1,N2,N3]],"F":[[0,1,2]..[M1,M2,M3]],"P":[[O1,O2,P3,..,Op]..[..]]}

The meaning of N is self-explanatory, as it stands for the name of the geometry. V represents an array of vertices. F is an array of triangular faces.

So far, the conversion into THREE geometries has been straightforward. However, P poses a challenge. It consists of an array of polygons, where a polygon refers to a face with more than four vertex indices.

While there are no specific restrictions on the number of vertex indices in a polygon, there must be a minimum of five.

Are there any effective methods available to convert a structure like this for use in THREE.js?

Answer №1

While three.js does support a Face3 class, there used to be a Face4 class as well. However, dealing with polygons requires a completely different approach. The short answer is that three.js does not have built-in functionality for handling polygons.

One way to approach this issue is by creating a fan out of your polygons, fixing one vertex and iterating through the others. However, this method only works for convex polygons.

https://en.wikipedia.org/wiki/Polygon_triangulation

Solving this problem is definitely not straightforward.

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