From ODE docs:
The Normals argument is optional: the normals of the faces of each trimesh object. For example,
...
This pre-calculation saves some time during evaluation of the contacts, but isn't necessary. If you don't want to calculate the face normals before construction (or if you have enormous trimeshes and know that only very few faces will be touching and want to save time), just pass a "NULL" for the Normals argument, and dCollideTTL will take care of the normal calculations itself.
http://ode.org/ode-latest-userguide.html#sec_10_7_6
...So it shouldn't need any normal info at all?
The Normals argument is optional: the normals of the faces of each trimesh object. For example,
...
This pre-calculation saves some time during evaluation of the contacts, but isn't necessary. If you don't want to calculate the face normals before construction (or if you have enormous trimeshes and know that only very few faces will be touching and want to save time), just pass a "NULL" for the Normals argument, and dCollideTTL will take care of the normal calculations itself.
http://ode.org/ode-latest-userguide.html#sec_10_7_6
...So it shouldn't need any normal info at all?