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Re:Show HN: SVG 3D Builder – Build 3D Models with SVG by wongarsu on Wednesday August 22, 2018 @08:12AM (#17818105)
SVG is HTML for arbitrary 2d shapes (yes, technically XML). Writing a 3d engine with it is akin to rendering PNG images by arranging colored divs. It is a hack with much better existing alternatives.
Re:Show HN: SVG 3D Builder – Build 3D Models with SVG by xigma on Wednesday August 22, 2018 @08:18AM (#17818126)
It's not a "3D engine", it's basic line and shape drawing.

With SVG, you will easily run into the same performance issues with any kind of dynamic content, 3D or not.

With Canvas, you may or may not run into them, depending on how much content you have.

In either case, performance is terrible compared to what you can do in a native application.