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Splitting A Model into 4 segments

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I load a model into memory and i have the vertices and faces of it. i want to divide the faces into the segments 1-4 |-----------| |..1..|..2..| |.....|.....| |-----|-----| |..3..|..4..| |.....|.....| |-----------| How would i sort the faces into their correct segment based on their position? Thanks

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You simply loop through each triangle and insert it where it can fit, plenty of code is available on google. :)
Search for something like AABB (Axis-aligned bounding box) + triangles or something similar.

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