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Old 07-10-2004, 02:40 PM   #1
Hubbard
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Default Nurbs Cube faces?

Why do Nurbs cubes' faces act as seperate objects when in either object or component mode?
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Old 07-10-2004, 02:48 PM   #2
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Basically any Nurbs shape like the sphere is basically a plane just rapped around to make a shape like a sphere

Cant remember why there like that they just are!!

*note
I could be wrong
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Old 07-10-2004, 03:05 PM   #3
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The Nurbs cube is the only Nurbs shape that has seperated faces.

Does a Polygon cube work with bump maps the same way a Nurbs cube does?
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Old 07-10-2004, 03:20 PM   #4
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I've got a book at home that explains all about nurbs, I'll have to read it again to tell you why there like that.

Not sure about the bumpmaps?
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Old 07-10-2004, 03:32 PM   #5
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A nurbs object is only mathematically capable of having 4 sides (although fairly unstable 3-sided nurbs objects are also possible), therefore, a true Nurbs cube is only possible (that I've found anyway) by taking a Nurbs sphere and manipulating it to be cube-ish in shape (ie. see image).

Add more isoparms at the edgs to get sharper geometry.

No, polygons have different setups then Nurbs when it comes to texture coordinates (UVs). The positive thing, though, is you can manipulate a polygon's UVs however you want, while a nurbs' object's UVs are pretty much stuck where they are.
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Old 07-10-2004, 05:05 PM   #6
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Thanks mtmckinley, is there a way to weld all the sides together so they can be selected as one object in object mode, possibly an attribute setting?
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Old 07-10-2004, 05:21 PM   #7
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you can group all the sides together although they might already be like that by default. select one side of the cube in object mode and hit the up arrow on your keyboard. if it doesn't work then go to the group option and try it again after.
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Old 07-10-2004, 05:25 PM   #8
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Or even easier....draw a c-shaped profile curve (the c-shape shouldnt curve but done with stright lines) for the cube and revolve 360 degrees, also linear, and 4 spans (think it's spans...im not in front of maya at the moment)...voila...instant cube.
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Old 08-10-2004, 08:41 AM   #9
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Or even easier just use polys
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Old 08-10-2004, 01:32 PM   #10
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Yeah, polys seems like the way to go, but do bump maps work on them? Do objects need a more detailed mesh to effectively accept bump maps?
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Old 08-10-2004, 01:37 PM   #11
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Yes bump maps work fine on them. You don't necessarily need higher geometry for bumps to look better.
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