Object3D: Add twoPassTransparentRendering.
#25156
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Fixed #24711.
Fixed #25149.
Description
Introduces
Object3D.twoPassTransparentRenderingwhich controls whether double-sided, transparent objects should be rendered with two passes or not.#21967 introduces two pass rendering for fixing transparency artifacts. However, since then we received multiple reports where users complain about performance degradations. The two pass rendering also breaks the evaluation of
gl_FrontFacingin a certain use case, see #25149.