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[孙灿 <question703571@xxxxxxxxxxxxxxxxxxxxx>]

Question #703571 on Yade changed:
https://answers.launchpad.net/yade/+question/703571

孙灿 posted a new comment:
I know what you mean. But while I'm using this code, I don't know how to call the grain itself. The relevant code is as follows (not all of it):
shuzu=[]
circleRadius=2
circleCenter = Vector3(0.05,15,6)
for b in O.bodies:
	d = (b.state.pos - circleCenter).norm()
	if d < circleRadius:
		shuzu.append(?)

def printInfo():
    print("=============")
    print("step",O.iter)
    for i,body in enumerate(O.bodies):
        print("body",i,"young",body.mat.young)
    for i,intr in enumerate(O.interactions):
        print("interaction",intr.id1,intr.id2,"kn",intr.phys.kn)
O.step()
printInfo()
def li():
	for body in shuzu:
    		body.mat = Mat2
    		for intr in body.intrs():
        		O.interactions.erase(intr.id1,intr.id2)
	printInfo()
I want to add eligible particles in the list shuzu[] using a for loop, and will change their material later using li(), I don't know how to call the particles themselves directly (put in the list shuzu[]), as I wrote shuzu.append(?). Maybe it's a very simple problem, but I don't know how to fix it.

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