[upstream] Tunable joint stiffness (box2d #934) #34
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Joint stiffness is now tunable per joint. This allows specific joints to have increased stiffness, which may be important for some games. Removed `b2World_SetJointTuning` Added `b2Joint_SetConstraintTuning` and `b2Joint_GetConstraintTuning`. Added `b2StoreWorldId` and `b2LoadWorldId`. Added `b2Joint_GetReferenceAngle`, `b2Joint_SetReferenceAngle`, `b2Joint_SetLocalAxisA`, and `b2Joint_GetLocalAxisA`. Removed `b2WeldJoint_GetReferenceAngle` and `b2WeldJoint_SetReferenceAngle`. Added `b2SpringDamper` math utility function used by the character sample. Fixed bug in `b2SolvePlanes`.
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Joint stiffness is now tunable per joint. This allows specific joints to have increased stiffness, which may be important for some games. Removed
b2World_SetJointTuningAdded
b2Joint_SetConstraintTuningandb2Joint_GetConstraintTuning. Addedb2StoreWorldIdandb2LoadWorldId.Added
b2Joint_GetReferenceAngle,b2Joint_SetReferenceAngle,b2Joint_SetLocalAxisA, andb2Joint_GetLocalAxisA. Removedb2WeldJoint_GetReferenceAngleandb2WeldJoint_SetReferenceAngle.Added
b2SpringDampermath utility function used by the character sample.Fixed bug in
b2SolvePlanes.