# cloth measures

 09 September 2006 pursuit New Member mavi istanbul, Turkey cloth measures i'm using EzFlex, however i have a problem, i cannot estimate cloths' sizes. For instance, about what sizes a skirt can be? length? weight?? when i enter the length 0.5 meter and weight 0.5 kg it stretches too much and i cannot get the results i wish. do you have any idea?? thanks... share quote
 09 September 2006 JulianS Know-it-All   portfolio julian Technical Animator/Modeler Los Angeles CA, USA I am dealing with the same problem..... Anyone outhere? __________________ www.mymentalray.com share quote
 09 September 2006 EUP-3D New Member Steven Carpenter Edinboro University of Pennsylvania Edinboro, USA SyFlex Documentation Appendix The appendix actually does a decent job of explaining how syflex calculates the clothe. It also has a java script calculator in which you input various numbers and it computes what the syflex settings should be. share quote
 09 September 2006 jmartin Frequenter As I understand it... input : L (length), T (time), M (mass), SA(surface area), TM(total mass) gravity = 9.81*(T*T)/L mass density = TM/SA spring stiffness = 12500*(T*T)/M spring damping = 5*T/M global damping = 0.25*MD/T Mass(M): lb = 454 1/2 lb = 227 1/4 puund = 111 gram = 1 kilo = 1000 Time(T): film = 0.041666 ntsc = 0.03333 pal = 0.0347078 Lenght(L): mm = .01 cm = .1 m = 1 inch =.0254 foot = 0.3048 Surface Area(SA): mel cmd: polyEvaluate -area surface area part is interesting.. Say you make a default polyPlane then run "polyEvaluate -area" on it , should return 0.999999, lets round that to a 1. divide what you want total mass of your cloth to be by SA I want the cloth to be equal to it's SA, so.. 1/1 = 1 , so that makes the pPlane1 mass density = 1. Sounds and is really simple. if your to run syInfo on your solver node, it would report something really close to 1, this works for any SA say your SA is 45.121 45.121/45.121 = 1 , notice the massDenisty attr will be very close to 1. If I wanted cloth to twice as heavy (45.121*2)/45.121 = 2 massDenisty = 2 lenght(L) only affects gravity.. From the above formula, notice (L) only affects gravity .. which will relate how heavy your cloth feels.. I've been useing inch lately (.0254) not that my show/production is working in inches, but I like the result it gives with what I've selected for mass. time(T) affect both gravity and spring stiffness From the above formula, time is used for in every part except mass density, I stick with what the projects working time unit is ( film in this case ). mass(M) affects springs stiffness, and spring damping... I don't know where 12500 comes from but that is what the syflex god suggests.. I've been using 1/4 pound lately (111) So when you put this all together, I usually start with something like this.. \$L=.0254 \$T=.041666 \$M=111 \$SS=12500*(\$T*\$T)/\$M; \$SD=5*\$T/\$M; mass density =1 ( TA/SA ) str = ((\$SS)*(SA*2)); shr = ((\$SS)*(SA*1.5)); bnd = ((\$SS)*(SA*.05)); str_d = ((\$SD)*(str)*1); shr_d = ((\$SD)*(shr)*1); bnd_d = ((\$SD)*(bnd)*1); self envelope is a global umber so it denpend on your working units so if your character is 6 units high (6 cm for me) self env should not get mych larger than .1 for thickness what I find interesting is once I've set the above values, I play with M and L to adjust the feel of the simulation. It almost acts like maya cloth scale and sample settings.. if I change M=1000 L=.1 from inch and 1/4 pound the cloth sims much loser... share quote
 09 September 2006 pursuit New Member mavi istanbul, Turkey thanks a lot for this very useful information... share quote
 10 October 2006 john_homer random guy   john homer cloth monkey wellington, New Zealand also, a couple of things.... in the docs, the equations call for the use of \$T it is suggested that you use 1/fps. ie, film is 24 fps use 0.041666 this IS the case for inputs into the "caluulator", however, this is only the case in some of the equations that the calculator uses internally, sometimes it actually uses 24 anyway.. you only really need to know that if you are going to write your own calculator (which I recommend) because of 1 of jMartins points.. and my next one... everyone thinks the calculator in the docs is rubbish (sorry gerard) but is is actually correct.. sort of.. Gravity - is correct Mass Density - is correct (but you can change it) Cloth Spring Stiffnesses - is correct Cloth Spring Damping - is correct Global Damping - is correct RELATIVE TO YOUR MESH remember all the input information is about the scene NOT the mesh... work out the relationship between the calculator output and your average faces per square unit (numberOfFaces/surfaceArea) and you will have a nice sim every time. and even get presets working .j __________________ Make something idiot proof and they'll just build a better idiot share quote
 10 October 2006 lucavfx Veteran portfolio Luca Zappala VFX Veteran London, United Kingdom Originally Posted by jmartin: Lenght(L): mm = .01 cm = .1 m = 1 I think this should be mm = 0.001 cm = 0.01 m = 1 Luca __________________ www.lucavfx.com share quote
 10 October 2006 jmartin Frequenter right u r , thanks for the correction, share quote
 12 December 2006 emrong a cloth guy   portfolio Emron Grover Cloth Tailoring/Simulation Lead Pixar Animation Studios Oakland, USA Originally Posted by john_homer: remember all the input information is about the scene NOT the mesh... work out the relationship between the calculator output and your average faces per square unit (numberOfFaces/surfaceArea) and you will have a nice sim every time. and even get presets working I'm writing my own calculator and I have been struggling with all the issues poeple have brought up. If it was possibly could I get some more clarity on this statement? Where would you use that number (numberOfFaces/surfaceArea)? How can I implement it into my calc? thanks a ton share quote
 12 December 2006 blendMinds Veteran blendminds --- USA for the calculation of mass, length and TA? Hi friends. am giving my sycloth values, SA(surface area)=949 TM(total mass) = 976.523 Time (film) = 0.041666 Length=?( which value i need to take here) What is the length how u r calculating L=.243 from where u got this value? these all are my cloth values, Please explain something about how u r calculating the values of \$L=.0254 \$T=.041666 \$M=111==============which mass value?, is this syflex defult or any other mass ? \$SS=12500*(\$T*\$T)/\$M; \$SD=5*\$T/\$M; mass density =1 ( TA/SA ) ===========what is TA ? str = ((\$SS)*(SA*2)); shr = ((\$SS)*(SA*1.5)); bnd = ((\$SS)*(SA*.05)); str_d = ((\$SD)*(str)*1); shr_d = ((\$SD)*(shr)*1); bnd_d = ((\$SD)*(bnd)*1); i went all these formulas still am not getting . please explain me .............. thx share quote
 12 December 2006 JulianS Know-it-All   portfolio julian Technical Animator/Modeler Los Angeles CA, USA As a user u can always contact http://www.syflex.biz/ at support@syflex.biz If u having problems trying to come out with those numbers just contact them they will help you. That is there job. __________________ www.mymentalray.com share quote
 01 January 2007 jmartin Frequenter TA is short for total area or total mass that value / surface area will get you the number to feed the solver mass attr in your example, 949 is your cloth SA, if you want the feel of twice as much mass, putting a 2 in mass attr will be = to 949*2/949 for mass unit.. 111 is equal to 1/4 pound and is what I often use for my mass unit 454 is a pound 1000 is a kilo the larger the mass unit the heavier cloth should feel/sim. Last edited by jmartin : 01 January 2007 at 01:13 AM. share quote
 01 January 2007 CGTalk Moderation Expert 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

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