First of all I'm aware of the existence of Q3D.
So yea, why does c2 haven't develop their own 3D plugin construct 2 yet?
Or to make it easier Why don't you guys adopt Q3D plugins?
It's a fundamentally different product, that would require a complete redesign, and would not fit in with the ease of use standard Scirra has committed to, due to the complexity.
Does that answer your question?
Feel free to bump this up in a few days if no one else answers.
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newt is pretty much spot on.