Hard to tell why, is that a single model or multiple models? If multiple models, perhaps it is not rendering because C3 engine does not know it is onscreen. If you can share a simple example project, I can take a quick look.
Hello, the floor is a 3d tile, compound by a lot of chunks. I will share the project and a video, I hope you can find a solution. The rare thing is this does not happen with the 3d shape object provide by construct 3. But obviously I prefer use your pluging.