2 questions of TP fragment

[Srek]

Hi,
you can try to use the original geometry as a collider, but of course collisions will then happen also to the now invisible since fragmented parts. Another option is to use particle / particle collision with a specificaly set distance or alternatively put the source particle and the fragments into different groups and do two particle/particle collisions with different settings.
The second problem is unsolveable currently, as you said it would need the ability to define the point of fragmentation on the particles geometry.
Cheers
Björn

[edfenner]

Hey Paul,
This sounds like a cool little adventure you are on. I would love to see what you come up with. Sounds like a great bit of thinking will go into these particles!

ed

[paulselhi]

Here is a quick divx of the idea..it is to be an explosion shockwave..just a bit of fun nothing essential i just am a TP addict, i get an idea then am obssesed with how to do it in TP


You know i am sure maxon put subliminal stuff in C4D it is so addictive !!!

http://www.black-and-white-to-color.com/stuff/tpswfrag.avi

I have 2 groups of particles from the hidden cube ( er..deformed cube !!)

Group is the main building and group 2 is the frags wind effects grp 2 only

There is coliision set between both groups and grp2-grp2

I have a deflector on the floor which is causing the usual problems of particles passing through, see the larger rotating parts.. i would love to know how to solve that but if it too difficult then some pyro dust will cover it

To get the building particle to say put i have set mass for each particle group so the building has a very high mass and so grp 2 bounce off it without moving it

I could try making the invisible building object a defector i suppose but then you would get collisions where there should be none as the structure should have broken away

The idea is to build a little set showing a blast wave travelling through it

[Medicine Horse]

I think your effect looks great so far and some dust will definately cover up the floor collisions. I didn't even notice them at first. You could try setting the deflector to "geometry" although it maybe be jumpy because the particles are already so close. Better yet render them separately and fake it in post. Nice work.

[paulselhi]

Yes post would be a good idea.. i think my problem is that i want too much from TP when i am only a total amateur when it comes to CG effects

In the real film world the priority is the shot and not the perfection of the TP or whatever tools used. Most movie cuts are no more than 5 secs and for action often shorter so i should be thinking about solving a lot of problems with "clever" placing of cameras and timing

We tend to be very "microscopic" when viewing our own effects but insitu within a whole movie effect i doubt whether Joe public is really checking out each fragment

Actually CG has spolied my enjoyment of many films as i keep looking at the CG SFX with C4D in mind, this happened a lot whilst watching LOTR

That said for a really spectacular slow mo shot of say the white house being blown away the collisions would have to be more complex and of course the geometry would be different

Maybe dust will cover a lot of problems and i also thought that the main particle fragments could be less numerous and more symetrical and perhaps have secondary parts ( smaller) fragmenting from them. It seems the smaller a fragment is the beter we can do the collisions as the center of mass is closer to the fragment boundaries

It is the long thin frags that cause the problems as the thin sides will bounce OK but the lengths will pass through floors and other objects

[CGTalk Moderation]

This thread has been automatically closed as it remained inactive for 12 months. If you wish to continue the discussion, please create a new thread in the appropriate forum.