Indexed BufferGeometry front and back side assignment - normals or order of indices?

Questions
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3

In this example CircleDynamicallyFormable ( from the Collection of examples from discourse.threejs.org ) I had made a mistake, and since I had used side: THREE.DoubleSide, I had not noticed it. Since then I make sure to test only front and back. The note about the error is still in the code:

line 103

    const setFace =  ( ) => {
    
        faceIndices[ idxCount     ] = a;
        //faceIndices[ idxCount + 1 ] = b;
        //faceIndices[ idxCount + 2 ] = c;
        faceIndices[ idxCount + 1 ] = c; // swapped here c and b
        faceIndices[ idxCount + 2 ] = b; // otherwise, the geometry is backsided
        idxCount += 3;
        
    }

You can test the wrong variant. :slightly_smiling_face: