Help! I'm stuck in the NURBS Tutorials.

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Help! I'm stuck in the NURBS Tutorials. // TS6 and Older

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Post by KevW // May 21, 2007, 10:13am

Total Posts: 14
Hello, I didn't know whether I should put this question in Tech Forums, New Users or here. So, as I'm using TS5.2 I thought I'd put it here.

I've just started doing the NURBS tutorials and I've fallen at the first hurdle.

The tutorial says to create a NURBS sphere with a latitude of 10 and all other values left as default. Then it shows a nice picture of a sphere with 9 latitude bands around it dividing it into 10 sections.

When I do the same thing I get the sphere with the nine latitude bands but it has another wire frame sphere around it with each of the 10 sections divided into three more sections, which makes it a bit difficult to see the NURBS sphere underneath (see image).

Should it be like this?


Post by rj0 // May 21, 2007, 3:01pm

Total Posts: 167
I have 5.1 (same as 5.2 but without facial tool) still laying around, so I gave it a quick try. I couldn't spot any display options that should cause this (but I could have missed something).

However, two thoughts do come to mind, OK maybe three. One, is that it almost looks like you have both a NURBS sphere and a poly sphere at the same location. I doubt that's actually the case, but ...., try moving 'it' and see if there is any separation.

The second and third thoughts have to do with display modes/drivers. Try the other real-time display mode (DirectX, if you are using OpenGL, or vice versa). Otherwise, perhaps updated drivers for your video card?



Post by spacekdet // May 21, 2007, 3:07pm

Total Posts: 1360
Looks like a poly sphere (dark blue mesh) and a nurbs (lighter blue mesh) sphere in the same spot. You can see the harder, straighter edges on the poly sphere. Nurbs are always smooth.

Post by Naes3d // May 21, 2007, 9:53pm

Total Posts: 0
Right Click the Convert Nurbs Patch to Polyhedron icon.

It probably says 'all' to the right of the word Display.

Click the word (that probably says 'all') and hold to brings up the flyout option to display 'patch', 'mesh' or 'all' .

Post by KevW // May 22, 2007, 12:27am

Total Posts: 14
Thanks for the replies and for trying to find out what I'm doing wrong. I'm following this tutorial:

I start with a new page, DirectX selected (9.0c), then I right-click the NURBS sphere and change the latitude to 10, then I left-click the NURBS sphere and that image I attached is what appears. I can move it around and it remains as seen.

I've progressed further through the tutorial now and have 'scissored' the sphere into 10 pieces. That was a bit difficult as the NURBS sphere latitude bands were hidden behind the wireframe sphere. I also moved each of the pieces to different locations, but they still kept their own individual sections of the wireframe.

I know you can hide light sources using the preferences so I'm wondering if this is something that is normally hidden by default but I've somehow managed to make it visible.

Post by spacekdet // May 22, 2007, 4:48am

Total Posts: 1360
Definitely some weirdness going on here display wise.
Do any of the other NURBS primitives also have you seeing 'double'?

Just off the top of my head, I'd suggest shutting down tS, navigating to it's directory, and deleting the truespace.cfg file.
It will recreate this file next time you restart tS and deleting it sometimes helps cure tS's indigestion.

Post by Naes3d // May 22, 2007, 5:46am

Total Posts: 0
I forgot to mention that if you want to hide the 'wireframe' you have to select the 'patch' option.

'Patch' gives you the smooth nurbs look and 'mesh' is what displays the cage.

When 'all' is selected it shows both the smooth patch and the mesh (which it looks like is what is going on in your case).

Did you right click the Convert Nurbs Patch to Polyhedron icon to bring up the dialog?

Post by Naes3d // May 22, 2007, 6:16am

Total Posts: 0

Post by spacekdet // May 22, 2007, 7:55am

Total Posts: 1360
By Jove, i think he's got it!

Post by KevW // May 22, 2007, 9:19am

Total Posts: 14
By jove, your right, he has got it!

Thankyou Naes3d, that looks much better!

Thanks again everyone, your help has been much appreciated. Don't go away, though. I'm bound to get stuck elsewhere!


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