Newton

- Density is not used and defaults to 0, mass defaults to 1

- Skin width property does nothing, it doesn't apply to Newton.

- Fixed , distance , and point-on-line joints not present (for now)

- Newton has hard coded scaling and force limits, so using a global scale value higher than 1UnitPerMeter may cause objects to sink into the ground.

- Motors and springs currently not available, although you can remedy this yourself with the SDK if you convert the joints to custom joints

PhysX

- Density defaults to 1, mass defaults to 0 (mass can be calculated automatically based on size and density if set to 0, or can be set explicitly

- The primitives cylinder, cone and elipse are not used and will default to their closest shapes

- Collision meshes can be loaded in from a mesh (eg .3ds ) and then cooked and stored as a cooked mesh file, or you can insert a ready-cooked mesh file.

- Skin Width must be >0. Defaults to 0.01 * units per meter.

ODE

- Linear and Angular Damping do not exist in ODE.

- Density calculates mass based on volume, Mass setting will only take effect if Density = 0.

- the Skin Width setting is for dWorldSetContactSurfaceLayer(). Can be 0 or more, will default to 0.001 * units per meter.

- In the edit tab, the CFM and ERP settings are global and for ODE only.

- The joint self-collision flag does not work, its too awkward to implement, it will always be off.

- No mesh collisions, they're too unstable. I may release a Gimpact version later for tri-mesh collisions.

- Very long Capsules, like in the windmill demo, can make the inertia go funny.