Hello Zokreb, Hello Yves, Hello everyone,

The GPU is very sensitive to streching or to pinching. This issue comes from the computation of the springs. I don't know if you use a version with a checkbox named "Springs CPU". This option allows to use the CPU only for the springs computation. The simulation is slower than a full GPU computation but it is faster than a full CPU computation. It allows to resolve many cases where the mesh explodes but keeping a good calculation speed. When you generate a deformation on the mesh, it can be interesting to remove the "Inertia". When the inertia is removed, each node does not keep its speed and each iteration starts with all the nodes speed at zero. This solution also allows to resolve many issues when one wants to apply a big deformation to a mesh. The inertia can be reapplied thereafter, when the simulation is stabilized.

About the remembering of some options when the program restarts, many options are already saved in a INI file. There are certainly new options which are not saved when the program closes. It will interesting to define all these options.

About the issue when something wrong happens in the program when it is in full screen mode, I think you use Ctrl-Alt-Del keys to stop the process. Personally, I always use Ctrl-Shift-Esc. These keys have two advantages:

• they allows to show the program manager in all situations,
• they are easy and fast to press with only the left hand. Using the thumb for Ctrl and Shift keys and middle finger for Esc key. This method will allow you to stop VWD. It is important to remember that VWD has not be stopped normally so the permanent loop goes on in DS. To resolve this issue, it is necessary to press on the "Stop VWD" button in the DS interface before to try something else.

Currently I do many improvements in the program and I add some new functions. These new functions come when I have a difficulty during a simulation. It would be very interesting to have some feedbacks on the issues you have had because they will help to improve the program. This happens when you think : it would be interesting to be able to do this or that.

Now, with Dan, we think we are almost ready to start the final V2. When all will be ready, it would be very interesting to use all the functionalities implemented by Dan to create community around the program on VirtualWorldDynamics.net.

I hope this will be a way to exchange simulation methods and results. Not only for the issues, but also when something works fine using a specific method. Myself, I have to do many tutorials because there are a lot of new functions in VWD.

Have a great day.

  Gérald

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