On Sat, Oct 8, 2022 at 7:14 AM johancc <joao.chave...@gmail.com> wrote:
> Hey, trying to create a radial pattern with a sphere in Python, but
> somehow I am missing the last sphere.
>
> [image: sphere.png]
>
> As you can see by the image and code below, I am trying to distribute 7
> spheres in 180 degrees. If I set it to 360 degrees works fine as it already
> has the last point, the first sphere. But if I set it to 90 or 180 for
> example, it misses the last sphere. I need to somehow add this last sphere,
> but not sure how.
>
> Increasing the number of spheres (max_iterations) won't do the trick as it
> will distribute one more object within a similar radius.
>
> btw, this can easily be done with MASH and duplicate special, but I need
> this in python.
> Thank you.
>
> import maya.cmds as cmds
>
> degrees = 180
> max_iterations = 7
>
> for i in range(max_iterations):
> #print (i)
> rotation = (degrees/max_iterations) * i
> #print(rotation)
> my_sphere = cmds.polySphere(r=0.15)
> cmds.move(2,my_sphere, x=1 , absolute=1)
> cmds.move( 0,0,0, [ my_sphere[0]+'.scalePivot',
> my_sphere[0]+'.rotatePivot' ], xyz=1, absolute=1 )
>
> cmds.rotate(rotation, my_sphere, y=1)
>
In the case of a complete circle this rotation calculation works because
the distribution is shorter and doesn't try to place spheres on a scale of
0-360 inclusive. So what you probably want is to actually place a sphere at
the last degree, inclusive.
Original:
degrees = 180
max_iterations = 7
[(degrees / max_iterations * i) for i in range(max_iterations)]#
Result: [0, 25, 50, 75, 100, 125, 150] #
[(degrees * (float(i) / (max_iterations-1))) for i in
range(max_iterations)]# Result: [0.0, 30.0, 60.0, 90.0, 120.0, 150.0,
180.0] #
Now with the updated calculation it creates the last sphere on the upper
limit of degrees (180). But you might not want it distributed that way for
a closed circle where it's going to overlap the first and last? So then
maybe you want to choose something like this?
for i in range(max_iterations):
if degrees % 360 == 0:
rotation = float(degrees) / max_iterations * i
else:
rotation = float(degrees) * i / (max_iterations-1))
print("#{}: rotation={}".format(i, rotation))
my_sphere = cmds.polySphere(r=0.15)
cmds.move(2,my_sphere, x=1 , absolute=1)
cmds.move( 0,0,0, [ my_sphere[0]+'.scalePivot',
my_sphere[0]+'.rotatePivot' ], xyz=1, absolute=1 )
cmds.rotate(rotation, my_sphere, y=1)
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