CGTalk nCloth "Mass" - Any relation to real world mass/weight?
 11-01-2010, 12:42 PM #1 FluidEdge Frequenter J 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" 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"? share quote
 11-01-2010, 09:03 PM #2 john_homer random guy   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 share quote
 11-02-2010, 08:19 AM #3 FluidEdge Frequenter J 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. share quote
 11-03-2010, 12:17 PM #4 FluidEdge Frequenter J 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? share quote
 11-03-2010, 12:17 PM #5 CGTalk Moderation Lord of the posts   Join Date: Sep 2003 Posts: 1,066,480 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. share quote