I am trying to retrieve the array of triangles from the geometry object, but I am having trouble locating it.
It seems that .faces in the object are not actually triangles. For example, when creating a cube, a face is structured like this:
"faces": [{
"a": 0,
"b": 2,
"c": 3,
"d": 1,
...
These elements appear to be polygons rather than true faces.
When inserting a Face4 into the faces array, you will generate a quad when calling faces. However, if you insert a Face3 into faces, you will receive a triangle in return. If you see a d when making a faces call, it means you have inserted a Face4.
If you're wondering how to obtain triangles from a quad, that is a separate question.
Essentially, considering the 'order' of the quad as A B C D, you can deduce that A B C and A C D generally form triangles sharing the same approximate normal as the quad. Note that this approximation may vary if the quad is somewhat distorted due to non-coplanar points. The less coplanar the points are, the more noticeable the skew will be, resulting in different normals.
There are other valid combinations as well. A simple method is to sketch out A B C D on paper and observe the direction (Clockwise or Counterclockwise). As long as your new triangles follow the same direction, they will work correctly. For instance, if A B C is a viable triangle, so would be B C A and C A B. Similarly, for A C D, consider C D A and D A C. Alternatively, you could also split it along the other diagonal to create A B D and B C D, forming corresponding triangles based on the given logic.
Isn't the responsibility of ".faces" to handle that task? Check it out here.
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