about stick and stickcontactconstraint

[logos]

Hi,
i’m new in sofa, and i’m trying to build a scence where a object can be placed on a rigid surface without sliding; i choose the spring force filed(tough i don’t know how it works and whethere it is right to use in the situation); at first i set the contact response as friction cantact ,and then set the friction cofficient as large as possible,but it doesn’t work out well;so i change the contact response as stick. after the object collide, it disappear from the scence! at last i change contact as stickcontactconstraint, it seems that the object is tend to stick to the surface but hard to be controled(as well as the haptics).
so,1. i want to know what’s the difference between these cantact response. 2.how spring force field work and is it righe to use this field in this situation? 3.theoretically, a large friction cofficient can stop the sliding,but why it doesn’t work here? 4.how to maintain the status in the stickcontactconstraint case？
thanks!

[Hugo]

Hi logo,

Thank you for your interest in SOFA!
Unfortunately I am no expert of these collision responses. From what I know, the friction is based on Signorini’s and Coulomb’s laws. But I don’t know well stick contacts.

What is sure is that using springs to models contacts, is a strong approximation since you will apply forces mimicking a contact..

Maybe somebody else would have more input about contacts in SOFA.

Best,

Hugo

[Author]

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