We recommend checking Obi’s document for cloth as reference. To setup cloth objects from 3D models (.obj, .fbx, etc.), you will need to purchase the cloth plugin provided by Obi. We will include the essential steps for setting up a cloth item.

Blueprint

A blueprint is an asset that stores a bunch of particles and constraints. It does not perform any simulation or rendering by itself. It's just a data container, not unlike a texture or an audio file. Blueprints are generated from meshes (ObiCloth and ObiSoftbody), curves (ObiRope) or material definitions (ObiFluid). For cloths, it contains the configuration of how to create particles from the mesh.

Generate a Blueprint

To generate a basic cloth blueprint, go to Assets->Create->Obi->Cloth blueprint, or right-click on a project folder and select Create->Obi->Cloth blueprint. It would be ideal of the mesh is a manifold.

When you generate the blueprint, it is doing the following

• Generate a list of merged mesh vertices, ignoring uv and normal seams.
• Generate a list of merged triangle edges and border edges.
• Generate one particle per merged vertex, and one distance constraint per merged egde.
• Analyze the resulting particle/distance constraint network to generate bending, volume, and aerodynamic constraints.
• Sort and group all constraints into batches for efficient runtime evaluation.

Edit a Blueprint

You can do the following operation to a blueprint

• Particle selection
• Property painting
• Texture import/export

Check the blueprint page for details, this page also contains other information about setting up the cloths.

Currently, we use BaseObjectAttr for Cloth. We recommend attaching BaseObjectAttr to the grasp points.