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Author Topic: Default spheres looking more like ovals?  (Read 7769 times)

ronaldefarmer

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Re: Default spheres looking more like ovals?
« Reply #15 on: September 15, 2014, 12:33:05 am »

Yeah, now I see what you mean. The Anim8or spheres don't subdivide very well. I think you are going to have the same problem subdividing any sphere constructed with longitudinal vertices converging at poles. It seems to me like it has more to do with subdividing than the spheres themselves.
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CrashDrive

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Re: Default spheres looking more like ovals?
« Reply #16 on: September 15, 2014, 01:03:37 am »

cooldude234 I think you mean arctic caps. lol

ronaldefarmer It definitely shows up after subdivision. Even my imported sphere had a slight variation but not
as bad as the default sphere. The sphere itself is perfect though. Creating one with 48 x 24 divisions still shows perfect
and the more divisions the more accurate the subdivision. Think we just have to live with it.  :)
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cooldude234

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Re: Default spheres looking more like ovals?
« Reply #17 on: September 15, 2014, 03:12:34 am »

LOL, it was originally misspelled and spellchecker came up and I just clicked on it thinking it would correct it to arctic instead of attic :P
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Kyle

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Re: Default spheres looking more like ovals?
« Reply #18 on: September 15, 2014, 04:26:34 am »

It shows up before and after subdivision, because its really about the proportions. It just becomes more apparent after subdividing because it simplifies things visually.
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ronaldefarmer

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Re: Default spheres looking more like ovals?
« Reply #19 on: September 15, 2014, 04:45:01 am »

Kyle,

Here is that Blender UV Sphere again if you want it. The original wasn't centered correctly but it should be fixed now.
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ENSONIQ5

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Re: Default spheres looking more like ovals?
« Reply #20 on: September 15, 2014, 09:02:22 am »

I must be missing something, standard sphere objects are identical from all directions on my system.  Image attached is a standard sphere, front view, with a duplicate over-laid and rotated 90 degrees in the Z axis.  The outsides align perfectly.

After subdivision there can be a difference, the poles don't subdivide well.  I normally subdivide the standard dodeca-rhomacuboctrahedron (or whatever it is... looks like a soccer ball!), divides down to quads and lacks the polar distortion.
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ronaldefarmer

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Re: Default spheres looking more like ovals?
« Reply #21 on: September 15, 2014, 03:00:50 pm »

ENSONIQ5, Same here, it just seems to be a problem with subdividing the sphere as far as I can tell.
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Kyle

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Re: Default spheres looking more like ovals?
« Reply #22 on: September 15, 2014, 06:59:54 pm »

My bad ENSONIQ, looks like your right.
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CrashDrive

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Re: Default spheres looking more like ovals?
« Reply #23 on: September 15, 2014, 07:15:22 pm »

Well...this is an interesting topic. I believe I said that in my previous post.
We are all correct in one way or another.

Sphere divisions in Anim8or I just realized are limited to 32x16, so overall dimensions
read perfect, but the surface won't be smooth.

Geodesic divisions are limited to only 6, so no luck here.

The Dodecahedron  primitive leaves an uneven surface as well, as far as I tell.

Subdivision on any of these leaves a non spherical surface.

The sphere below is visually perfectly smooth and absolutely spherical by measurements.
Unfortunately it was made using 256 x 256 divisions ( in another program) and weighs in at a
hefty 3.5 megs.


Is there a way to make a visually smooth sphere with perfect dimensions in Anim8or ?
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Kyle

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Re: Default spheres looking more like ovals?
« Reply #24 on: September 16, 2014, 01:00:42 am »

I guess we could manually squash it along the Y axis until its just right. That would be annoying though.
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ronaldefarmer

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Re: Default spheres looking more like ovals?
« Reply #25 on: September 16, 2014, 04:09:29 am »

I don't think you can make a perfect sphere in Anim8or presently. Here is one exported from Blender. It isn't perfect but it is very close, better than the others that I uploaded. I have attached a new plugin if anyone wants to check it out.
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TheSmoothGodMaster

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i have found a video
« Reply #26 on: October 12, 2014, 02:23:47 am »

heres a video on the anim8or shapes, it covers the sphere/oval. [url]www.
[url]
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CrashDrive

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Re: Default spheres looking more like ovals?
« Reply #27 on: October 12, 2014, 03:28:24 am »

Although appreciated, making basic shapes isn't what this topic is about. :)
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Raxx

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Re: Default spheres looking more like ovals?
« Reply #28 on: October 14, 2014, 06:20:31 am »

Well, I know I'm a bit late, but here's a solution I made if you're working with mesh objects. It's a simple spherical deformer script, which places all points an equal distance from the midpoint of the mesh. Basically, spherizes it. There's also an attribute option called spherize_Factor, which you can set from 0.0 to 1.0 (1 being entirely spherical, and 0 being the original shape). Select the mesh shape you want to deform and run the script, and it'll turn it into a perfect sphere.

The image shows an example of it working on a subdivided sphere and cube. It'll work on any mesh, really.

« Last Edit: October 14, 2014, 06:25:16 am by Raxx »
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cooldude234

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Re: Default spheres looking more like ovals?
« Reply #29 on: October 15, 2014, 06:32:50 am »

Very nice script indeed, but the problem doesn't lie in the vertexes themselves (anim8or has geodesic for much more even spheres) but rather their UV coordinates and anim8ors way of generating them.
As you see in the image attached when anim8or generates the uv coordinates spherically you have issues with the 'poles' of the sphere.
I kinda wish there was a feature in anim8or to manually edit each and every individual vertices UV coordinate. It would make fixing these things by hand much easier.
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