materials work now! the material type (steel, plastic, etc.) is automatically detected from the plasticity of each part because LS-DYNA doesn’t encode material names. also, i had to switch to manual gLTF generation to add the material properties and joint metadata.

however, when i was adding the joint detection, i found that inter-part constraints may constrain an arbitrary number of nodes in arbitrary locations, which makes it impossible to map the entire assembly of parts to specific screws in a way that makes sense for a game. instead, i think i’m going to use an absolute grid system for part placement, and just take the part positioning for granted