Rewind Time + Cell Fracture

[capdevon]

Hi everyone, as promised I posted the source code on github.

GitHub - capdevon/jme-capdevon-examples: A collection of useful and fun demos...

• Use the mouse to move around the scene with the flyCam.
• Press the zero key ‘0’ to enables / disables BulletAppState debugging.
• Press and hold the ‘Enter’ key to rewind the time (Note: remember that the controller remembers the position and rotation of the fragments of the last 5 seconds but you can change it as you like).
  jme-capdevon-examples/TimekeeperControl.java at c0634cd965d87f2936e28ca1f00747d707b22bb2 · capdevon/jme-capdevon-examples · GitHub
• Release the ‘Enter’ key to allow physics to act on the cube fragments.

Rewind time in jMonkeyEngine

You can change the physical attributes of the fragments by following the official engine documentation.

jMonkeyEngine Docs

The controller to rewind time is really simple and easy to understand, you can find it here:

https://github.com/capdevon/jme-capdevon-examples/blob/main/src/main/java/com/capdevon/demo/TimekeeperControl.java

The Main to run the app is here:

capdevon/jme-capdevon-examples/blob/main/src/main/java/com/capdevon/demo/Test_CellFracture.java

To model the cube I used Blender’s “Cell-fracture” free addon. Here you can find a short tutorial on how to use it.

Free Blender Addon - Cell Fracture

Brackeys’ video explains all the steps in a clear and fun way.

REWIND TIME in Unity

Let me know if you will use this demo or if you add some interesting ideas of yours with some examples and images.

[oxplay2]

Nice, looks really simple

not sure if classes like “RaycastHit” are required there, looks like TimekeeperControl.java is only important there.

Could you put it into https://store.jmonkeyengine.org/ please?

Myself, maybe in some future i would want do some reverse-physics, but not just right now (anyway it would require network physics sync)

[capdevon]

I would like, could you explain me how to do it?

[oxplay2]

you need account there(idk if it pull it from HUB, dont remember)

and then just go to https://store.jmonkeyengine.org/user/my-pages/
and create one can provide only Github link, would be good to provide artifacts, but its not needed i think.

then wait for approve. (i belive @RiccardoBlb is looking at approve list? - maybe could be worth add more people who can look at it)

[polinc]

Definitely hit the store with your project.

[capdevon]

Thanks @polinc even your libraries on the store are very cool, I send the request as soon as possible

[polinc]

Join discord. It’s much faster to get things going.