How to learn shaders in jme? (I need it to wave a flag)

[yn97]

I want to learn using and writing shaders in jme to simulate a waving flag…
where is the step by step tutorial and docs?
if you did it (waving flag) please share your code.

[thetoucher]

Cloth and Spring classes

Hey folks, I’ve implemented a SpringSystem and have implemented Cloth on top of this. The cloth is implemented as ClothPatch and CollidingClothPatch with the second one having the built in ability to handle object collision. You can make custom forces to act on the cloth at the node level by extending SpringNodeForce. Simple wind, gravity and drag versions are obtainable via the ClothUtils class. I’m pretty happy with it. In my demo class I have a cloth with 2,500 nodes and ~29,000…

I did a search, it literally only took 5 seconds, considerably less time than it took to write this, read the OP or even author the OP…

[JESTERRRRRR]

It’s from 2004
That said no reason it couldn’t be adapted - I am not the person to ask, would you want to make the necessary changes to get it working in jme3 or would you start over and do it as a shader?

I am learning shaders atm, it doesn’t seem overly difficult if you put some time into it. Do you actually want a flag that reacts to physics or is this just a looping animation with no dynamic interaction with physical objects?

[yn97]

I want to write a waving animated flag . yes a looping animation with no dynamic interaction with physical objects.
I watched a video clip on youtube that had done it via shaders in jme.

[Darkchaos]

Animation is the keyword here.
Check out @Ali_RS Tutorial about how to bake such things from blender into a regular animation

[yn97]

would you mind giving me a link?

[Domenic]

I didn’t know that using Google is so difficult. @yn97, you should learn to use it, no joke!

Blender : Bake Physics to Keyframe Animation

[MoffKalast]

I’m pretty sure you’re looking for this series:

Especially Part 7.1 and 7.2

[Ali_RS]

Hi Younes

I have not created video tutorial for flag waving.
This is just a demo video and do note i am not using shaders, it is just a animation i am playing by updating mesh.

JME + Blender : Physics Demo

You can do usual soft body animation in blender.You can search the web for “Animating flag using blender softbody” . There are lots of videos on youtube.
Then for importing it in jme, here is how i am doing it

(June 2016) Monthly WIP screenshot thread

Do physic simulation in Blender (can find lots of tutorials in YouTube) then export it to .obj while checking “Animation” option . It exports each frame as an .obj file. Then in JME load all of them as an Array of Mesh and save it on main model like geometry.setUserData("SoftBody", meshArray) ;//Array of keyframes and update mesh data each frame on main model. like: geometry.setMesh(meshArray[i]) ;// i is frame number after saving mesh data you can remove all .obj files.

If you run to any problem please ask.

[joehot200]

Why are you trying to do these with shaders?

It would be much easier to just do it with an animated model.

If you need, I can even help you with that, as I too will be adding animated flags to my game in the next few days.

[Tryder]

I think the easiest way to do this in the shader would be to use a normal map to distort the texture and scroll the normal map. This does not modify the actual geometry, just gives the illusion of movement. Here’s an example: Deus Ex 3 – Folds | Simon schreibt.

[Denis_Tislenko]

Hi Joehot, did it work to you to make a flag using animated model?
If you used blender cloth simulation, how did you get it exported into JME?