Issue in Three.js: The lower part of the mesh is not rendering

After converting a mesh from .obj to json using the official converter (https://github.com/mrdoob/three.js/tree/master/utils/converters/obj), I noticed that the mesh displays correctly from one side, but not the other. This seems to be due to the fact that it only has one side, essentially a plane, with all faces and normals pointing in the same direction.

Any ideas on how to resolve this issue?

Edit: One solution I've considered is duplicating the mesh and applying material.side = THREE.BackSide; to one of them, but I'm not convinced that loading it twice is the most efficient option.

javascriptthree.js

Answer №1

By default, only the front faces of triangle primitives are rendered when utilizing the WebGLRenderer. However, you can change this behavior by adjusting the following:

material.side = THREE.DoubleSide; // or THREE.BackSide

The determination of the front face is based on the winding order of the vertices.

When the vertices of a triangle are specified in counter-clockwise order (CCW), the front face will be facing towards you. Conversely, if they are specified in clockwise order (CW), the front face will be facing away from you.

While it is possible to modify this behavior using the WebGLRenderer.setFaceCulling() method, it is unlikely that you will need to do so.

Version: three.js r.75

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