nCloth "Mass" - Any relation to real world mass/weight?

Become a member of the CGSociety

Connect, Share, and Learn with our Large Growing CG Art Community. It's Free!

THREAD CLOSED
 
Thread Tools Search this Thread Display Modes
  11 November 2010
nCloth "Mass" - Any relation to real world mass/weight?

Can anyone help me out with how nucleus calculates mass and how this figure relates to real world mass of a cloth garment?

The nucleus white paper states that "in terms of physics, the mass does not need to be in the real world units for proper collisions as long as the relative values are the same"

and

"there are two factors that make mass setermination more complex: air resistance and point density"

So point density I understand to be the ratio between number of faces and number of CVs.

We can easily work out the surface area of a mesh, so given a known mass of cloth, can we translate this into an "nMass"?
 
  11 November 2010
mass is per point (vertex/particle) not area.
$mass * $vertCount = $garmentMass
__________________
Make something idiot proof and they'll just build a better idiot
 
  11 November 2010
so a garment weighing 500g with 7000 verticies should have a 'mass' of 500/7000 = 0.0714?

Since mass is so important in the nucleus solver calculations, getting this right at the start with a calculation is very useful. Is there nothing about surface area/scene scale involved in the calculation though?

I wonder if Duncan can shed any light on this and give us the calculation.
 
  11 November 2010
OK this mass calculation is not accurate. Can anyone shed any light on how the mass attribute is calculated?
 
  11 November 2010
Thread automatically closed

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.
__________________
CGTalk Policy/Legalities
Note that as CGTalk Members, you agree to the terms and conditions of using this website.
 
Thread Closed share thread



Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

vB code is On
Smilies are On
[IMG] code is On
HTML code is Off
CGSociety
Society of Digital Artists
www.cgsociety.org

Powered by vBulletin
Copyright 2000 - 2006,
Jelsoft Enterprises Ltd.
Minimize Ads
Forum Jump
Miscellaneous

All times are GMT. The time now is 10:01 PM.


Powered by vBulletin
Copyright ©2000 - 2017, Jelsoft Enterprises Ltd.