Duplicate spheres in half circle

[johancc]

Hey, trying to create a radial pattern with a sphere in Python, but somehow I am missing the last sphere.

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)

[Justin Israel]

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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[joão chaves]

Hey Justin. Thank you so much, this works perfectly :) And that solution for the full circle comes in handy too!

Just in case someone stumbles upon this, there is a small typo in your code, an extra ")" at the end of the else line. (at least was giving me a syntax error)

Awesome, have a great weekend!

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[Justin Israel]

On Sat, 8 Oct 2022, 2:07 pm joão chaves, <joao.c...@gmail.com> wrote:

Hey Justin. Thank you so much, this works perfectly :) And that solution for the full circle comes in handy too!

Just in case someone stumbles upon this, there is a small typo in your code, an extra ")" at the end of the else line. (at least was giving me a syntax error)

Oops :-) 

Awesome, have a great weekend!

You're welcome. Enjoy! 

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