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arcus
08-17-2005, 10:45 AM
Hello,

yesterday I made a Quicktime movie of some of
my rigid body dynamics tests using the
IMPACT3 plugin from Dynamic Realities.
I think if you need working rigid body dynamics in LW this is
the best way to go. I hope Newtek will buy a
physical accurate engine for LW9 because I don't
expect LW-Dynamics can be reach that level of realism.
Impact works similar to the dynamics in XSI and Maya and
even if it is 2 years old the results are good and not
so hard to reach like the buildin dynamics.

I like to see your best results using impact or LW-dynamics.

Is there a place to share dynamics, software indipendent?


The picture shows some content of my movie.

I am not able to host the file myself, so maybe
some of you could host my 10 MB movie.


Thank you

Marcus

telamon
08-17-2005, 12:03 PM
According to a rumour (http://forums.cgsociety.org/showpost.php?p=2475839&postcount=53)it seems that Newtek is doing work for that. I hope that ageia (http://www.ageia.com/)could be part of our future. (see the discussion here (http://forums.cgsociety.org/showthread.php?t=233821&page=4&pp=15)).

I strongly trust Mike Pauza. He is not the kind of man showing his logo to say unreferenced words.

It is a step forward.

arcus
08-17-2005, 02:42 PM
That is great news if it become true :). For LW9 I think it is too late
to integrade. Btw, Impact3 is very good integraded in LW and it is accurate.
The downside is that impact is slow when calculating large scenes with many
collisions. My car break wall scene has about 250 Collision objects and took
about 10 hours to finish. But most smaller scenes with up to 20 objects are finished
in under 5 min.

Darth Mole
08-17-2005, 03:09 PM
Totally agree - Impact 3 might be slow, but the end results are fantastic. I think it's a shame that development has ceased on it: with some tweaks and extra features it could have been truly awesome.

For example, when you set up the bricks in that wall, Impact 3 is contantly checking for all inter-object collisions, even though they're not moving until the car hits - which is why it takes so damn long to simulate. I wish you could specify, like saying 'all these objects - don't bother simulating them until frame xx and stop when their velocity reaches xx.' (If there IS a way of doing this please let me know!)

It would also be good to set accuracy independently, so collisions between simple cubic bricks requires a lot less accuracy than collisions with the curvy car.

Basically, ways of optimising simulations to speed things up... If Dave Vrba's reading this, what do you reckon?

arcus
08-17-2005, 03:24 PM
Totally agree - Impact 3 might be slow, but the end results are fantastic. I think it's a shame that development has ceased on it: with some tweaks and extra features it could have been truly awesome.

For example, when you set up the bricks in that wall, Impact 3 is contantly checking for all inter-object collisions, even though they're not moving until the car hits - which is why it takes so damn long to simulate. I wish you could specify, like saying 'all these objects - don't bother simulating them until frame xx and stop when their velocity reaches xx.' (If there IS a way of doing this please let me know!)

It would also be good to set accuracy independently, so collisions between simple cubic bricks requires a lot less accuracy than collisions with the curvy car.

Basically, ways of optimising simulations to speed things up... If Dave Vrba's reading this, what do you reckon?

You can envelope the use of LW motion until one frame before the car hits the wall.
I also tripled all objects for simulation and use host shape even if the bricks are boxes.
Then you could optimize the scene that not every brick is set to collied with everything.
For example set one brick to collied only with the nearby bricks+car+bottom.

coremi
08-17-2005, 04:36 PM
sorry to tell you Telamon but XSI implemeted AGEIA and not Newtek, and Mike Pauza was pretty upset about it.

telamon
08-17-2005, 05:04 PM
And I am also upset against me :D

But I said I hope AGEIA ignoring what was under the hood. I only quoted Mike's post saying that NT is licensing something, not forcefully AGEIA ;)

arcus
08-18-2005, 11:03 AM
I found a free webhosting service but had to split the movie
in two parts because of file size limitation.


impact3-1.avi (http://www.gwebspace.de/3dmeier/Movies/impact3-1.avi) (4mb)

impact3-2.avi (http://www.gwebspace.de/3dmeier/Movies/impact3-2.avi) (5.5mb)

Marcus

mav3rick
08-18-2005, 01:02 PM
marcus i just checked both of your movies and all i can say WOA.. yea that's what lw dynamic miss occurate calculation.. specially u can see it if u try to do same simulation of chains u did in 2nd movie where u have that rings... lwfx absolutly cant make them look that way... they just freak out.... impact indeed is the most occurate and precise dynamic on lw for now.. i just hope newtek work hard on lw9 to bring that kind of dynamic in lw nativly... too sad IMPACT develop stoped

Darth Mole
08-18-2005, 01:06 PM
Here are a few examples I did ages ago...

http://homepage.mac.com/sjarratt/iMovieTheater8.html
http://homepage.mac.com/sjarratt/iMovieTheater9.html
http://homepage.mac.com/sjarratt/iMovieTheater10.html
http://homepage.mac.com/sjarratt/iMovieTheater12.html

I had to cheat on the last one by using an upside-down weight-on-a-spring to recreate the upwards motion of a coiled spring.

Thanks to Marcus I'm inspired to go off and do some more now!

pelos
08-18-2005, 06:21 PM
check this tutorial that i did for lw some time ago
might not be perfect but the colicion on lw8 you dont need to wait 8 hrs to see if you like it or not, i did this totorial on lw 6 or 7 i dont remeber very good, but was with another plugin that simulate explocion,

you need winrar to uncompres it
http://www.megaupload.com/?d=31NAMUTW

Darth Mole
08-19-2005, 03:14 PM
Impact 3 doesn't take 8 hours. Most the stuff on my site was 20-30 mins. Well worth the wait.

mav3rick
08-19-2005, 08:39 PM
true..... the most amazing is occuracy and way it deal with normalization... no shaking

Jarrede
08-20-2005, 01:43 PM
Wow I'm impressed, tell me it doesn't cost 2k!! :)

the normalization is very nice, didn't notice any shaking, everything behaved properly exept something about the brick wall caught my eye... A lot of those scenes looked shy on the poly count side, how well does it handle loads of polygons? Where's it's limit?

How's the user interface?

I had to do a scene a few months back of a freeway collapsing, and I was pretty frustrated with LW 8's built in rigid bodies. This looks like a nice solution, it should come with LW!! :)

Darth Mole
08-20-2005, 04:57 PM
$395

http://www.dynamic-realities.com/

More videos and a demo version.

Jarrede
08-20-2005, 05:00 PM
$395

.

I'm really liking that...

coremi
08-20-2005, 06:07 PM
as i know DRBA, creator of Impact and Particle Storm works for Newtek now, also with INO so we might see some goodies in LW9, or not, who knows ?

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