@fivecat : Bravo!, that's exactly how you should proceed.
Thank you for your videos, they show fluid results and that really please me a lot. In terms of fluidity, everything depends on the result you want to achieve.
If you would like more rigidity on the Biscuits's dress,  you can use both types of rigidity simultaneously. The rigidity by neighborhood will help to keep all separated parts of the habit and the rigidity by extension will stiffen the parts that seem too soft. Please note that rigidity can quickly become too large. An value of 3 in extension with a softness of 0.01, generally gives very rigid clothes. It all depends on the mesh size. For example for the dress you show, you can keep the ridigité as you put it currently and add to the bottom of the dress, a rigidity with an extension of 3 and softness of 0.05 for example. I trust you to do the tests. Global and local stiffening possibilities are almost limitless.

@Grimhilda : Thank you again for your video because it shows the difference between the cloth room in Poser and VWD. This video shows both calculation speed and fluidity of the simulator. I personally have always been disappointed with the clothes animations in Poser. One could use it only for static positions and nothing more.

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I'm working on updating the demo program.
The Selection by Lasso works.
I think I secure the interface buttons. I will await your feedback.
Regarding the removal of files from the "Exchange" directory, I think, as said Biscuits, that a button would be practical. For cons, I would want not invade the interface with buttons that have no direct relationship with the simulation. Do you think that a new "Utilities" tab would be a good solution. This tab would have the default settings of the program and some utilities buttons.
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