Due to the 5000 poly count limits when importing custom meshes into Roblox, my team is thinking about chopping up high poly count custom mesh into multiple pieces and bring them into Roblox. We are not too familiar with Roblox but there seem to be two ways to put these pieces together into one. Namely union and welding.
What are the major differences between the two? I’m particularly interested in the performance differences in both methods and how they affect the physics engine if at all.