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[Jan Stránský <question701222@xxxxxxxxxxxxxxxxxxxxx>]

Question #701222 on Yade changed:
https://answers.launchpad.net/yade/+question/701222

    Status: Open => Answered

Jan Stránský proposed the following answer:
Hello,

please try to make your code a MWE [1].
M = minimal
two (or just a few) spheres are sufficient to target your problem. Moreover, with fixed spheres, you may already know the expected result.

Knowing sphere centers and radii, it can be computed with simple math
###
for i in O.interactions:
    b1 = O.bodies[i.id1]
    center1 = b1.state.pos
    radius1 = b.shape.radius
    # same for id2
    radius = getRadiusFrom(center1,radius1,center2,radius2) # some simple math
###

Or you can try to use a builtin method. You are using MindlinPhys. Searching MindlinPhys for something about radius gives [2], is it what you are looking for?
###
for i in O.interactions:
    contactRadius = i.phys.radius
###

Cheers
Jan

[1] https://www.yade-dem.org/wiki/Howtoask
[2] https://yade-dem.org/doc/yade.wrapper.html#yade.wrapper.MindlinPhys.radius

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