CGTalk > Software > Autodesk Maya > Maya Dynamics
Login register
Thread Closed share thread « Previous Thread | Next Thread »  
Thread Tools Search this Thread Display Modes
Old 11-01-2010, 12:42 PM   #1
United Kingdom
Join Date: Apr 2008
Posts: 266
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"


"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"?
Old 11-01-2010, 09:03 PM   #2
random guy
john_homer's Avatar
john homer
cloth monkey
wellington, New Zealand
Join Date: Oct 2002
Posts: 1,396
mass is per point (vertex/particle) not area.
$mass * $vertCount = $garmentMass
Make something idiot proof and they'll just build a better idiot
Old 11-02-2010, 08:19 AM   #3
United Kingdom
Join Date: Apr 2008
Posts: 266
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.
Old 11-03-2010, 12:17 PM   #4
United Kingdom
Join Date: Apr 2008
Posts: 266
OK this mass calculation is not accurate. Can anyone shed any light on how the mass attribute is calculated?
Old 11-03-2010, 12:17 PM   #5
CGTalk Moderation
CGTalk Forum Leader
Join Date: Sep 2003
Posts: 1,066,478
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

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

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
Society of Digital Artists

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

All times are GMT. The time now is 02:28 AM.

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