[Bf-committers] IRC Meeting Minutes, 15 Aug, 2004
Thu, 19 Aug 2004 12:31:03 +0200
Great! That's three people already. :)
I am still recovering from LA jetlag and the busy period I've had the
past month. My intention is to come with a structure proposal first,
especially on the level how to integrate it within Blender nicely. That
has it's limitations (and possibilities). For the real math & physics
involved I'll need a lot of help from the experts then.
Let's do the initial discussion on this maillist then, and - if
possible & required - try to make an appointment for a special irc
session on the issues.
On Wednesday, Aug 18, 2004, at 12:30 Europe/Amsterdam, David
>> IRC Meeting Minutes, 15 Aug, 2004
>> 2) B-Con 1: possible 2.35 features & roadmap
>> * softbodies (Ton R/Jensen O.M.)
> Hi all,
> I missed last IRC meeting, but in a previous one, I said I was willing
> help with the softbodies. Since I have been very busy recently
> (finding a
> job...) I haven't made any progress. According to last meeting
> minutes, Ton
> and Jensen are in charge now, so I just want to give a recap of what I
> thinking about.
> I wrote roughly a year ago an overview of softbodies simulation in
> graphics. It it is part of an heavy (~30 MB) pdf you will find here:
> However, I have put (temporarily) a relevant excerpt here:
> IMHO, there are two interesting approaches for softbodies in Blender.
> both cases, you need to transform your surface triangular mesh into a
> tetrahedral mesh by (temporarily) inserting internal vertices. (Not an
> problem if you want to obtain "nice" tetrahedra, but I think several
> solutions are
> * First softbodies approach: discreet model.
> A paper on this method is available here:
> - Pros: easy to code (extension of mass-spring systems), easy to
> easy to tinker with (IMHO, this is very important for artists).
> - Cons: rough approximation of the real physical behavior, eg, it is
> difficult to obtain quasi-incompressible behavior.
> I have to clean the code written for this paper, compile it under
> linux and
> mswin to provide a nice demo. I think I can do this before the end of
> * Second softbodies approach: continuous model.
> IMHO, the most relevant paper is:
> G. Picinbono, H. Delingette, and N. Ayache. Non-Linear Anisotropic
> Elasticity for Real-Time Surgery Simulation. Graphical Models,
> 65(5):305-321, September 2003.
> You can find it here:
> - Pros: classical continous mechanics equations solved in a very
> efficient way, thus the model is fast and accurate.
> - Cons: difficult to tinker with the model without a good continous
> mechanics background, and thus potentially difficult to use for
> That's all! Sorry for the long post. I welcome any question you may
> Bf-committers mailing list
Ton Roosendaal Blender Foundation firstname.lastname@example.org