btKinematicCharacterController: unwanted bouncing on terrain

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Hello everyone,

I've been having fun with Bullet for some time, and right now I'm in the process of making a character move on a variable terrain.


Overview

I have two objects: a btKinematicCharacterController for the character, and a heightfield-based rigid body for the terrain.

Using the character controller's setWalkDirection() method, I can move it around on the terrain.


Problem

General movement on the terrain is a bit rough, and when the character goes down a hill, he appears to bounce.

I believe this is because there is too much friction, which prevents the character's shape from rubbing against the ground smoothly.


What I've tried

I've looked around and found a few suggestions, none of which have made any noticeable changes. I've seen the following line of code several times throughout the forums:

Code: Select all

discreteDynamicsWorld->getSolverInfo().m_splitImpulse = true;

I've also tried a few other things:

• using setMargin() on the character's collision shape, then on the terrain's
• retrieving the character's ghost object and calling its setRestitution() method
• calling the ghost object's setFriction() method

I know btKinematicCharacterController is still experimental, but I'm sure there's just something I haven't tried yet.


Question

Is there a well-suited way to soften contact between the character and the terrain?