I Get Trouble About Wind Computation about nvcloth HOT 6 CLOSED

delta points in the direction of travel of the triangle center (relative to the wind).
Drag acts in the opposite direction, as it should slow down the movement.
Hope that clears things up.

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Oh， I see！ I got wrong about understanding “air drag”. Now everything is clear! Thanks a lot! @v@

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Hello, I have two problem about wind:

1. "delta points in the direction of travel of the triangle center (relative to the wind).", But I found this code : T4f delta = current - previous + wind; Usually, relative to a speed, we use subtraction，why here wind is added to the delta。

// orthogonal to delta, in delta-normal plane, same length as delta
T4f liftDir = cross3(cross3(delta, normal), delta * scale);
I found the annotation the length should same as delta，but cross3(delta, normal) will mutiply a sinTheta，should the code to be like this “T4f liftDir = cross3(cross3(delta, normal), delta * scale)/cosTheta;”？
NvCloth work fine in my project, but the wind always makes me confused。 thanks a lot！

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Sorry the code should be “T4f liftDir = cross3(cross3(delta, normal), delta * scale)/sinTheta;” ？

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I agree that this code is a bit confusing.
The sign of wind is already flipped in this line:
result.mWind = transform(result.mRotationMatrix, translation - wind) & maskXYZ;
in src\IterationState.h:298
I hope that helps.

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thank you，I got it！

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