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Fix a bug related to the law of action and reaction in btGeneric6DofSpring2Constraint. #4438

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@yahei yahei commented Mar 30, 2023

The relA and relB in calculateJacobi() are vectors used to calculate the torque that the linearAxis applies to the bodies.
Therefore, relA and relB should point to the same coordinate, but they were pointing to the connection points of bodyA and bodyB respectively.
This caused a bug where the positions where the action and reaction forces were applied were shifted when the relative positions of the bodies changed.

To fix this, relA was corrected to point to the connection point of bodyB.

…pring2Constraint.

The relA and relB in calculateJacobi() are vectors used to calculate the torque that the linearAxis applies to the bodies.
Therefore, relA and relB should point to the same coordinate, but they were pointing to the connection points of bodyA and bodyB respectively.
This caused a bug where the positions where the action and reaction forces were applied were shifted when the relative positions of the bodies changed.

To fix this, relA was corrected to point to the connection point of bodyB.
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yahei commented Oct 9, 2023

fig

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