A nother question about XSI

[medicine-horse]

Hello y`all XSI-friends!!!!

Lately I

[atyss]

Bonjour Edrik,

You'll be disappointed with nurbs in XSI, as its potential is still not fully exposed (not very much, in fact). Many operations will produce incorrect results. I hope that in future releases this issue is addressed.

To turn on Geometry Approximation for polygons objects, select the object, and Property > Goemetry Approximation. There you will be able to adjust the level of subdivision.

Hope this helps
Salutations - Cheers
Bernard Lebel

[medicine-horse]

Well Thanx a lot for your reply....And yes I

[fuzy]

@@Many operations will produce incorrect results

-Depending on the complexity of what you want to do IMO. I've recently had some good experiences using nurbs in XSI-not anything advanced through...

[atyss]

Well I'm glad you had good results, because in my case I had a hard time getting something correct.

For example, if you do an extrusion on path and close the extrusion (creating a close rail, for example), the rail is twisting in Y axis (along the path), so the end is upside down. Also, the Birail always gives me a distorted surface, even if centers and operator stacks are frozen. The Four-sided also gave me troubles.

So if I have a serious nurbs job to do, I will try to avoid XSI as much as possible! I prefer to use SI3D for that.

Salutations - Cheers
Bernard Lebel

[fredc]

"...if you do an extrusion on path and close the extrusion ..."

Atyss,
Not sure if this is an issue, but what about instead of extrude along a path, use a curve deformation on a linear extrusion. It makes it much simpler to control textures, and edit the model.

Just a though,
Urp

[fuzy]

Hehe - being a former Maya user i know that XSI has a way to go in that field, so i do follow you. When i say simple i mean: i wanted to make a [kind of] jellyfish. Very simple shape so i could do it with a deformed cylinder. I had to attach 'round 800 individual 'hairs' to the surface, so i used curve from surface and kept the history on. The rest was a bunch of path constrains... Nice and easy - and the XSI nurbs behaved nice all the way through. But again, looking at the geometry itself it was very simple, nothing fancy.

[medicine-horse]

Ok guys.....I

[atyss]

You can't do that only with Geo Approx. You have to hide the subdivided surface. Go in the Eye icon (viewport topbar) and choose Visibility Options. Go in the Attributes tab.
Uncheck Subdivision Surfaces in the left column. If you uncheck it in the right column, your object will disappear when you deselect it.

Or, instead of using the Geo Approx, you can select the lowpoly object and do Model > Create > Poly.Mess > Subdivision. This will create a new object, subdivided. Select the new object and open its visibility ppg (found under the object's name in the Explorer). Uncheck View Visibility and Selectability. It will render but will be invisible. You can put all subdivided objects on a single layer to ease this process.

Hope this helps
Salutations - Cheers
Bernard Lebel

[ob1]

Ok, maybe Im way off here, but is erik talking about faceting his model?? maybe not.... but if you are erik in the geom approx dialog box, change the discontinuty angle to 0 instead of 60.

[medicine-horse]

Thanx mr. Lebel!!

OK... so the procedure is a bit different from Mayas, just have to get use to another approach....

Erik