AddMuscle AddPropMuscle angularLimits angularPinning behaviours blendTime ContainsJoint controlsAnimator DisableImmediately DisableMuscleRecursive DisconnectMuscleRecursive EnableMuscleRecursive FixMusclePositions FixMusclePositionsAndRotations FixTargetToSampledState fixTargetTransforms FlagInternalCollisionsForUpdate FlattenHierarchy Freeze Freeze GetMuscle GetMuscle GetMuscle GetMuscleIndex GetMuscleIndex GetMuscleIndex GetMuscleIndex HierarchyIsFlat humanoidConfig initiated internalCollisions isActive isAlive isBlending IsDisconnecting isFrozen isKilling IsReconnecting isSwitchingMode isSwitchingState IsValid Kill Kill manualAngularLimitControl manualInternalCollisionControl mapDisconnectedMuscles mappingWeight mode Mode muscleDamper muscles muscleSpring muscleWeight OnFixTransforms OnHierarchyChanged OnMuscleDisconnected OnMuscleReconnected OnMuscleRemoved OnPostInitiate OnPostLateUpdate OnPostSimulate OnPreSimulate OnRead OnWrite pinDistanceFalloff pinPow pinWeight propMuscles Rebuild ReconnectMuscleRecursive RemoveMuscleRecursive RemoveRagdollComponents ReplaceMuscle Resurrect SampleTargetMappedState SetAngularLimitsManual SetInternalCollisionsManual SetMuscles SetMuscleWeights SetMuscleWeights SetMuscleWeights SetMuscleWeights SetMuscleWeightsRecursive SetMuscleWeightsRecursive SetMuscleWeightsRecursive SetUp SetUp SetUpTo solverIterationCount solvers state stateSettings StoreTargetMappedState storeTargetMappedState supportTranslationAnimation SwitchToActiveMode SwitchToDisabledMode SwitchToKinematicMode targetAnimation targetAnimator targetRoot Teleport TreeHierarchy updateJointAnchors UpdateMode updateMode visualizeTargetPose

bool updateJointAnchors = true When the target has animated bones between the muscle bones, the joint anchors need to be updated in every update cycle because the muscles' targets move relative to each other in position space. This gives much more accurate results, but is computationally expensive so consider leaving it off.