2). I really don't understand why we should use Twig : Smarty is older, why using yet another template engine ? Or I've got a better idea : we could use the template engine used in phpBB2 : he's older !
I'm agree that standardization would be just fine(c), and I like the Twig syntax, but I think the "YATL, we should use Twig" argument is not relevant.
IIRC, you can change a Renderer size using renderer.setSize(w, h). In order to update the camera aspect, you just have to use : camera.ratio = w / h; camera.updateProjectionMatrix().
I'm agree that standardization would be just fine(c), and I like the Twig syntax, but I think the "YATL, we should use Twig" argument is not relevant.