Cloth Trampoline

[peder521]

I created a simple scene with a piece of cloth between two cylinders. I have a NURBS sphere affected by gravity to fall on this "trampoline", but the sphere keeps passing thru the cloth rather than bouncing off the cloth no matter how stiff I make the cloth, etc. Any ideas?

Thanks,

[rogerw]

hi!
1.Do you ever make the nurbs ball a rigid body?
2.don't forget make the ball a collision object.

[rogerw]

3.Set your gravity's attenuation in a proper value!

roger.

[nieder3d]

OK heres a little trick you can use- you have the cloth trampeline, now wrap deform a nurbs plane to it and make it a Active rigid bodie, make the ball a passive rigid bodie and make sure you make it a collision object for the cloth-
with the nurbs plane wrap deformed to the cloth you can turn the visibility off on the cloth mesh when you render- because the nurbs will update and look like cloth...
-good luck
sid
sid69graphic@yahoo.com

[peder521]

I thought the sphere has to be and active body to be affected by gravity?

[peder521]

I did all those things and the ball still tears thru the cloth. any other suggestions? Thanks!

[nieder3d]

email me your .mb -I'll fix it then tell you how...
-sid
sid69graphic@yahoo.com

[nieder3d]

Ok- if you havn't seen it yet check your e-mail, The trampoline works - it took about 10 minutes.
-First off any time you create a pisece of cloth that doesn't need to be fitted such as pants or a shirt you do not need to use the Relax Frame Length in your Solver Scale Attr's- If you look in your solver the only thing I changed there was that.
Next I took your piece of cloth and duplicated, just straight duplicated it so that it wouldn't be linked to anything as cloth- it's now just a poly surface- I called it polyDub, with polyDub selected I shift selected your piece of cloth went to Deform>Create Wrap and in the options set it to 1 as max distance. Next just so I didn't have to mess with anything you may have already done on your rigid body and gravity is I deleted them and then started over just selected the ball made it an active rigid body then selected the polyDub and made it a passive rigid body. I created a new gravity fields and connected it to the ball- The Active, Passive, and Gravity are all set to default so with some tweaks here and there you can really have a nice looking trampoline. The only thing else I did was in your collision attr's for the ball as the cloth collision object - you had 0 for collision Depth, I made it .5, see with no collision depth as soon as a vertex from the ball passes through the cloth it won't solve or even try to push it back, -The general process is as I did above earlier in this post...
-hope that helps and if you have any more questions feel free,
-good luck,
sid
sid69graphic@yahoo.com

[nieder3d]

and yes I did post the rigid bodys backwards earlier, the ball should be active and the plane or wraped surface should be passive, sorry for that sometimes you just can't remember exactly whats whats...
-sid

[nieder3d]

-heres one better, I played with the trampoline scene some more and found that you can make the cloth also a passive rigid body eliminating the need for the wrap deformed mesh as the passive.
-So create cloth- make ball make it a cloth collision obj. Then make it an active rigid body, add gravity to it, then select the cloth and make it a passive rigid body, the ball hts the cloth surface creating collisions and not penatrating - thus bouncing back up...
-can send you an updated scene if you wish...
sid
sid69graphic@yahoo.com