Real-Time Physics Simulation Forum

Re: Bullet 2.71 Dynamica Maya Plugin crash on 'dRigidBodyArray'

2008-09-22T16:28:30+00:00

[...]to have them populated at the first frame as well?[...]

Thanks Nicola, I noticed it's been fixed... that's great!
I'm going to start writing some Dynamica utility scripts now...
Cheers.

Statistics: Posted by RBD — Mon Sep 22, 2008 4:28 pm

Re: Bullet 2.71 Dynamica Maya Plugin crash on 'dRigidBodyArray'

2008-09-20T14:36:38+00:00

Excellent Nicola, that opens up a bunch of possibilities for scripting/baking rbArrays within Maya!

For a moment I didn't think it was working because on frame 1 the positions and rotations were still reported as 0. I noticed a simulation step needs to be run before positions and rotations are populated. Also, when the scene is rewinded the values don't change (they remain at their last value). I guess I'll just have to assume that if we are on the first frame, to use initialPosition and initialRotation... or... how difficult would it be to have them populated at the first frame as well?

Thanks Nicola, much appreciated.

Edit: BTW, there appears to be a 4K maximum for rigid bodies? (on my Windows 32-bit with Maya 2008 anyhow; and it doesn't appear to be a RAM / PC resources issue)... I can create up to around 4000 rigid bodies and everything is fine, but if I hit 4096, then Maya crashes. For example, if I create a sphere array of 16x16x16, then Maya crashes. Perhaps, if there is an internal limit, it should be caught.

Statistics: Posted by RBD — Sat Sep 20, 2008 2:36 pm

Re: Bullet 2.71 Dynamica Maya Plugin crash on 'dRigidBodyArray'

2008-09-20T10:28:11+00:00

Just committed the changes, revision 1322.

Statistics: Posted by Nicola Candussi — Sat Sep 20, 2008 10:28 am

Re: Bullet 2.71 Dynamica Maya Plugin crash on 'dRigidBodyArray'

2008-09-19T08:56:19+00:00

Ok Nicola, thanks! I'll try to get the latest changes compiled and try it out.

Edit: Hi Nicola. I downloaded the latest trunk (rev. 1316) and compiled it. I noticed there have been some changes, but the dRigidBodyArrayShape's position and rotation arrays still appear to return 0 0 0 regardless. Of course... I could be doing something wrong...

Statistics: Posted by RBD — Fri Sep 19, 2008 8:56 am

Re: Bullet 2.71 Dynamica Maya Plugin crash on 'dRigidBodyArray'

2008-09-18T09:46:05+00:00

Ok, now during the simulation, position[n] and rotation[n] should contain the state of the rigid bodies.

Statistics: Posted by Nicola Candussi — Thu Sep 18, 2008 9:46 am

Re: Bullet 2.71 Dynamica Maya Plugin crash on 'dRigidBodyArray'

2008-09-17T11:59:44+00:00

Thanks Nicola, that's great!

BTW there is a thread over at the CGSociety forums (CGTalk): Disney's Dynamica plugin for Bullet Physics.

Cheers.

Edit: a question Nicola: Appears dRigidBodyArrayShape.position[n] and .rotation[n] do not return current position/orientation of array items? Is there a reason for this, or is it a bug? Would be great to know where a RigidBodyArrayShape item is located; would enable us to set initialPosition[n] after a simulation run has positioned them in a desired rest state (simple loop script to read position[n] and write initialPosition[n]). Also, it would allow us to place objects/instances/particles in position and to bake. I realize the export to .pdb file option is there, but it would be great to access that data directly from within Maya. Thanks again!

Statistics: Posted by RBD — Wed Sep 17, 2008 11:59 am

Re: Bullet 2.71 Dynamica Maya Plugin crash on 'dRigidBodyArray'

2008-09-17T08:18:09+00:00

I'm going ahead and add the multi-select creation for the next release. The rotation problem is a known issue, I'm gonna fix that as well.

- Nicola

Statistics: Posted by Nicola Candussi — Wed Sep 17, 2008 8:18 am

Re: Bullet 2.71 Dynamica Maya Plugin crash on 'dRigidBodyArray'

2008-09-17T01:02:26+00:00

plz was any able to fix the strange behaviour of translation and rotation when converting object to rigid body .

Statistics: Posted by smallpixel — Wed Sep 17, 2008 1:02 am

Re: Bullet 2.71 Dynamica Maya Plugin crash on 'dRigidBodyArray'

2008-09-20T01:02:12+00:00

Hi, just installed the Maya plugin... nice.

But am also experiencing the strange rotations, it makes object placement difficult. For example, given a polyCone:

polyCone -r 5 -h 10;
rotate -z 60deg;

When I try to make that cone an active rigid body (Mesh or Hull), the cone gets rotated and points in a different direction. For positioned objects with complex meshes, they get both moved and rotated.

Edit: Oh, and Maya's bounding box for these rigid bodies is messed up... try the universal manipulator on that cone, or something like:
xform -q -boundingBox dRigidBody1;

Thanks.

Statistics: Posted by RBD — Tue Sep 16, 2008 11:42 am

Re: Bullet 2.71 Dynamica Maya Plugin crash on 'dRigidBodyArray'

2008-09-12T21:33:45+00:00

So the plugin runs fine now (apart from the issues)?

copy/paste of a cube rigid body is still a cube here. How can we reproduce this?
Multi-select and changing the shape will only change a single primary selected object indeed.
Haven't reproduced the other (rotation) issues. Can you attach a zipped Maya .mb file that shows the rotation issue?

Thanks for the feedback,
Erwin

Statistics: Posted by Erwin Coumans — Fri Sep 12, 2008 9:33 pm