Sub-d's, NURDS & Polys?

Maya for 3D Printing - Rapid Prototyping

In this course we're going to look at something a little different, creating technically accurate 3D printed parts.

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# 1 24-12-2002 , 12:19 AM

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Location: London

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What's the main diffrence between modelling in sub-d's, NURBS, and Polys. When & why would it be appropiate to use what type?
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# 2 10-01-2003 , 07:39 PM

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polys and subd is pretty much the same thing, except subd smooths it out, and you can work in different detail levels in sub d

nurbs is based on curves, its useful in certain situations like when you need extreme model accuracy

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# 3 11-01-2003 , 01:58 AM

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Yep, he's right. Since nurbs are made from curves, they tend to be smoother. Most modelers use nurbs for organic-looking objects. Polygons, on the other hand are made up of faces. You can manipulate the vertices with extrememly accurate presicion, which makes it easy to design non-organic objects. The drawback to polygons is that you must have an unholy number of faces to achieve the smoothness nurbs would offer. As far as sub-divs go, all I know about them is that it is easy to model a vararity of objects without some of the restrictions you would normally get with poly's or nurbs. Sub's are a cross between poly's and nurbs, although as qu2k said, they are slightly more like polys.

Also, when you create polygonal primitive objects, they are always connected. It is one whole object. With a nurbs cube, however, the faces can be moved away from the object without any geometrical changes in the other faces and a nurbs cylinder has no top or bottom faces unlike a poly cylinder.

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