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that's really cool product you guys are developing! very impressed! just curious how you draw 3d? using 3d context in canvas or just plain 2d canvas context?

Thanks, we are pretty excited about it! :-) We use WebGL for rendering on the client side. We have a custom 3D engine written just for Tinkercad. Our main UI guy is an ex game graphics/AI programmer http://digestingduck.blogspot.com/. He's done stuff like the Zen Bound iPhone/iPad game and AI for Crysis.

If you are interested in seeing the rendering technology our viewer works for everyone, take a look at this bunny model: https://tinkercad.com/p/acc048395e191555

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