FET004 Multibody

Multibody physics: jointed assemblies articulate at their joints.

Overview

This family confirms that an asset built from multiple bodies connected by joints actually articulates. The tests discover the asset’s movable joints and verify that the bodies those joints connect move relative to one another under simulation. A robot arm, a gripper, a door panel, or any other jointed assembly must be able to demonstrate real relative motion across its joints, not simply coexisting as rigidly fused geometry.

What a Passing Family Means

A reviewer, PM, or OEM can trust that the asset is a genuinely articulated assembly rather than a fused or static mesh. At least one of the asset’s joints produces measurable relative motion between its connected bodies, confirming the joint is not seized, its axis is correctly authored, and the connected bodies are free to move within the joint’s allowed degrees of freedom. An asset that passes this family is ready for downstream robot simulation that depends on joint articulation.

Tests

Test	What It Checks	Validates
joint_movement	Discovers movable joints and verifies that at least one joint produces measurable relative motion between its connected bodies.	FET004_BASE_PHYSX, FET004_ROBOT_PHYSX

Relationship to the Feature

This family validates the runtime behavior described by FET004 Multi-Body Physics.