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Wheel slip nonlinear effect part 2 (not for merging) #3399

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This has some additional commits since #3342 was closed

This breaks ABI, so is not intended for gazebo11.
Compute and cache mass in Model::Init.

Signed-off-by: Steve Peters <[email protected]>
This returns the total forces added by the
AddForce and AddRelativeForce APIs. This change
breaks ABI and is not intended for gazebo11.

Signed-off-by: Steve Peters <[email protected]>
Apply scaling to slip compliance above and below
threshold slopes to induce a nonnlinear effect.

Signed-off-by: Steve Peters <[email protected]>
The slip compliance parameters are currently scaled
by the number of contact points, but this can cause
issues on heightmaps when transitioning between
triangle patches. This adds a parameter to disable
the scaling behavior, while retaining the current
behavior as the default.

Signed-off-by: Steve Peters <[email protected]>
This extends the nonlinear wheel slip model with
piecewise linear parameters for the slip compliance
multipliers.

Signed-off-by: Steve Peters <[email protected]>
* Refactor the data definitions and parsing method
  to reduce duplication.
* Refine some unit vector calculations in ODEPhysics
  as well.

Signed-off-by: Steve Peters <[email protected]>
@scpeters scpeters closed this Sep 27, 2024
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