We're excited to announce that as of our latest stable release, Construct now supports an official 3D model object! You can now import 3D models to your project...
Nice to see this development and the change in policy. Along those lines, I have added a couple suggestion items to the c3 feature repo that could improve the final 3D render. One is passing worldpos and normals from vertex to frag, this will make frag based lighting possible on GPU (compared to how I am doing now with vertex lighting on a cpu worker). The bigger topic is to have custom vertex and frag shaders. I understand vertex is generally delicate, but perhaps restrict it to 3D objects. Another possibility is to allow insertion into the vertex shader, rather than replacement (this is how renPy handles modifying shaders, with a priority system): renpy.org/doc/html/model.html