Hello Surody,

Of course, I can answer for VWD. This issue is caused by the high parallelism in GPU. The computation of the springs (Sticks) has to update 2 node positions at the same time. Higher the parallelism, higher these vertices can loose some updates, generation this jittery movement. If you want to reduce this, you can check the "Sticks CPU" checkbox. The program will compute the sticks using the CPU and the parallelism will be reduced for this computation. The result will be better if the head is still.

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