THREE.CullFaceNone
Disable face culling.
THREE.CullFaceBack
Cull back faces (default).
THREE.CullFaceFront
Cull front faces.
THREE.CullFaceFrontBack
Cull both front and back faces.
THREE.FrontFaceDirectionCW
THREE.FrontFaceDirectionCCW
var renderer = new THREE.WebGLRenderer();
renderer.setFaceCulling ( THREE.CullFaceBack, THREE.FrontFaceDirectionCCW ); //defaults