Deformation Constraints in a Mass Spring Model to Describe Rigid Cloth Behavior

This paper describes a physically based model for animating cloth objects derived from elastically de formable models and improved in order to take into account the non elastic properties of woven fabrics A cloth object is rst approximated to a deformable surface composed of a network of masses and springs the movement of which is evaluated using the numer ical integration of the fundamental law of dynamics We show that when a concentration of high stresses occurs in a small region of the surface the local de formation becomes unrealistic compared to real de formations of textiles With such an elastic model the only solution to decrease these deformations has been so far to increase the sti ness of the deformed springs but we show that it dramatically increases the cost of the algorithm We present therefore a new method to adapt our model to the particularly sti properties of textiles inspired from dynamic in verse procedures R esum e Cet article d ecrit un mod ele physique d animation des tissus variante des mod eles elastiques d eforma bles et am elior e de fa con a prendre en compte les propri et es non elastiques des textiles Nous mod e lisons tout d abord une pi ece de tissu par une sur face d eformable constitu ee d un r eseau de masses et de ressorts Son mouvement est evalu e gr ace a l int egration num erique de la loi fondamentale de la dynamique Nous montrons que lorsqu une forte concentration de contraintes appara t a certains en droits de la surface la d eformation locale y de vient irr ealiste compar ee aux d eformations rencon tr ees dans les tissus r eels Avec un tel mod ele elas tique la seule solution permettant d att enuer cette d eformation etait jusqu a pr esent d augmenter la raideur des ressorts d eform es mais nous montrons que ceci faisait cro tre dramatiquement le co ut de l algorithme Nous pr esentons donc ici une nou velle m ethode permettant d adapter notre mod ele aux propri et es particuli erement rigides des textiles inspir ee des proc edures de dynamique inverse