stencil is disabled by default since r163 (you seem to be using r168) - related. You have to enable it manually in WebGLRenderer constructor new WebGLRenderer({ stencil: true, /* ... */ }).
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stencil is disabled by default since r163 (you seem to be using r168) - related. You have to enable it manually in WebGLRenderer constructor new WebGLRenderer({ stencil: true, /* ... */ }).