Create Shape without using PolyMesh?

[Brutile]

Is it possible to create a custom shape for collision without using Shape::PolyMesh(surface)?

It seems like a waste creating the surface just to create a shape from it.

Can I make the shape in a similar way to creating a surface? Because Shape::PolyMesh is slowing my game down.

 

More Info:

I am trying to create a minecraft-like voxel terrain, but I am stuck at performance. I could increase framerate by making the chunks bigger, but then it stutters from the time it takes to create collision. If I reduce the chunk size, it makes collision creation smoother, but the draw calls increases and framerate drops.

 

PS. I've done everything I can to reduce the poly count in the chunks, so there is nothing much I can do to improve things. The only bottleneck I have is the shape creation, which I have no control over. That is why I ask.