Face is not drawn

Question

I try to draw a mesh with several faces.

Some of the faces are drawn some of them not.

When instantiating a mesh which is normally not drawn, with the index

Answer 1

The face front is determined by the winding order, not the face normal. The default winding order is counter-clockwise (CCW).

Have a look at the source of Geometry.computeFaceNormals(), and notice how the computed face normal is consistent with a CCW winding order.

three.js r.58