Selectionbox and orthographic camera

When you have an indexed buffer geometry, coordinates of vertices must be taken by indices of vertices in faces. So you have to work with .index property.

Take a look at this topic: Volume of THREE.BufferGeometry()

It works with both indexed and non-indexed buffer geometries. See, how it gets coordinates for p1 , p2 , p3 vectors in dependence on type of geometry.

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