Question #658629 on Yade changed:
https://answers.launchpad.net/yade/+question/658629
Jan Stránský proposed the following answer:
###
def cylSurf(center,radius,height,nSegments=12,thick=0,**kw):
"""creates cylinder made of boxes. Axis is parallel with z+
center ... center of bottom disc
radius ... radius of cylinder
height ... height of cylinder
nSegments ... number of boxes forming cylinder
thick ... thickness of the boxes
**kw ... keywords passed to box function (e.g. material, color ...)
"""
# just converts (a,b,c) to Vector3(a,b,c) to enable "center + ..."
center = Vector3(center)
# nSegments angles to define individual boxes, from 0 to 2*pi
angles = [i*2*pi/nSegments for i in range(nSegments)]
# centers of boxes. Vector 3(radius,0,0) rotated by angle 'a'
# z coordinate is .5*height
# center + shift = center of corresponding box
pts = [center + Vector3(radius*cos(a),radius*sin(a),.5*height) for a in
angles] # centers of plates
ret = []
for i,pt in enumerate(pts): # for each box center create corresponding box
# "length" of the box along circumference, cylinder circumference /
nSegments
l = pi*radius/nSegments
# extents, half dimensions along x,y,z axis
es = (.5*thick,l,.5*height)
# by default box is axis-aligned, we need to rotate it along z axis
(0,0,1) by angle i*2*pi/nSegments
ori = Quaternion((0,0,1),i*2*pi/nSegments)
# have a look at utils.box documentation. pt=center of box, es=extents
(half dimension), ori=orientation
ret.append(box(pt,es,ori,**kw))
return ret
###
you can use print to see the values if you want to understand what is going on.
You can also write your function from the scratch.
cheers
Jan
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