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Say that I want to create a perfect sphere or a perfect torus. How common is support for objects like this in any 3D modeling program?

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Please add a lot more detail to the question. For print? For screen? Using which software? Which platform(s)? Why do you want this? Context is important, as is detail. – Marc Edwards Jan 1 at 8:30
The way you've aked this question makes it kinda weird. Unless this is something like a school assingment... Or something... I don't know why you'd need this information. – Joonas Jan 1 at 19:12
I want to know if I can make perfect spheres or perfect toruses before I begin making what I want to make. – Melab Jan 2 at 0:06
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I just don't comprehend why you'd ask this question the way you have. You don't mention any software names, or ask us to do so. Even if it is common thing, who's to say you don't pick up that one that can't create torus/spheres, which would make the question kinda useless. -- Pretty much all of them can. Perhaps not some basic one's that only offer basic shapes and nothing more. A lot of proper 3d modeling programs do include torus and sphere object, but even if they don't, you can still create them easily. + when you can create virtually anything in in 3d, torus and a sphere should be doable. – Joonas Jan 2 at 7:31

closed as not a real question by Kyle Sevenoaks, Scott, Ryan, plainclothes, JohnB♦ Jan 8 at 0:11

It's difficult to tell what is being asked here. This question is ambiguous, vague, incomplete, overly broad, or rhetorical and cannot be reasonably answered in its current form. For help clarifying this question so that it can be reopened, see the FAQ.

2 Answers

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I assume that by true curves and perfect sphere you mean unapproximated.

Some 3D software packages are created specifically for polygonal modelling. Any 'curved' shape or object you create there is approximated to segments or polygons and thus is not 'perfect'.

Most of modern 3D software packages support NURBS and/or Bézier curves and surfaces which are 'real' curves and surfaces in terms of how they are handled. However, certain curves and surfaces that exist in real world require certain mathematical apparatus to be exact. For instance, a circle, a sphere or a torus requires NURBS support since Bézier curves or surfaces are only approximating these objects.

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The complete, unabridged answer to your question as asked:

Very common.

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