Drag will compute NaN values if the character teleport to a new position

[xoyojank]

MoveSpeed value will be very very large

[TojiroIwamoto]

Hi

I don't know if this is appropriate, but we tried to deal with it this way and it stopped being NaN,
The Drag section has a behavior that seems to diverge infinitely when warping or moving at high speed.

You might want to brush up the code more.
We are not looking for strictness, so this was a good enough behavior for us.
It would be great if the person who created SPCR could improve it if possible!,

AnimNode_SPCRJointDynamics.cpp

			if (bUseDrag)
			{
				float MoveSpeed = Displacement.SizeSquared();
				FVector VelNormalize = Displacement.GetSafeNormal();
				//instead of -1 can I make the -1/2??
				FVector DragForce = -1 * ((Point.Drag * MoveSpeed * VelNormalize) / 2);

				Displacement += DragForce;
			}

↓

			if (bUseDrag)
			{
				float MoveSpeed = Displacement.SizeSquared();
				FVector VelNormalize = Displacement.GetSafeNormal();
				//instead of -1 can I make the -1/2??
				FVector DragForce = -1 * ((Point.Drag * MoveSpeed * VelNormalize) * 0.5);

				//Start CUSTOM Not to diverge endlessly.
				if (Displacement.Length() > DragForce.Length())
				{
					Displacement += DragForce;
				}
				else
				{
					if (Displacement.Length() > 0.001f)
					{
						float gainScale = Displacement.Length() / DragForce.Length();
						Displacement += DragForce * gainScale * 0.9999f;
					}
				}
				//Custom End
			}