CGTalk - How to... tire!

TuLe

09-04-2003, 04:00 AM

Hello again my fellons mayans!

Here i'm with a brand new question for the maya user outhere!
I wanna make a slick tire for my car using the birail 3+ tools (or any other tool good for it) So i have 8 profiles curves and 4 (but i'll use only 1) rail curves to form the tire surface...
http://www.digitaldome.hpg.ig.com.br/images/tire1.jpg

I select first the profile curves in order one after another...
http://www.digitaldome.hpg.ig.com.br/images/tire2.jpg

The shape result is perfect the only problem is that i can't close the surface. It just stops in the 7th profile... All the curves are snaped together but there's this gap onto the surface!
http://www.digitaldome.hpg.ig.com.br/images/tire3.jpg

Can someone help me out here? Is birail the best tool to produce such surface using thoes curves?

:Thanks:

wgreenlee1

09-04-2003, 04:22 AM

I would just try to Loft it and rebuild the surfaces to get the curvature where the side meets the tread area...
I havent tried it but seems like you have a lot going there for such a simple object.
I'm gonna try it but I dont know.

Or maybe Lathe...Yes I mean Revolve...thanks floid

floid parkins

09-04-2003, 04:24 AM

try a revolve

jscott

09-04-2003, 04:30 AM

I'm not an expert but it looks like it worked correctly. It created a surface from curve 1 all the way to curve 8. So is worked right.

What I would do now is do a birail 2 from curve 8 to curve 1. Use the same rail. It's okay the rail can longer than the distance from the two profiles. Birail will only create the surface between the two profiles.

Now you have 2 surfaces that you need to stitch together.

Why not just go the other way. Instead of going around the tire why no go from front to back. It looks like you already have the curves to do this very easily.

-jscott

jscott

09-04-2003, 04:32 AM

Doh! Revolve is even easire. Thanks Floid. Remember to move the Pivot point of the revolve curve so you get the correct diameter. You would be revolving one of the profile curves.

-jscott

wgreenlee1

09-04-2003, 04:38 AM

Revolve is easy..
This is what I got in like three operations...
Draw the profile>adjust to taste>Revolve.

TuLe

09-04-2003, 04:46 AM

I'm not an expert but it looks like it worked correctly. It created a surface from curve 1 all the way to curve 8. So is worked right.

The birail operation went right wit you? Here it just stops in the 7th curve as metioned before... strange!

Well i did used revolve and it worked like a charm now... i tried it before but it got all screwed up, must've been my pivots or something... Amazing how the solution was right under my nose... Thanks floid parkins and keep on posting man, raise up your posts helping every one out!!!

:Thanks:

jscott

09-04-2003, 04:50 AM

The birail operation went right wit you?

What I was trying to say is that your origional idea wasn't going to work because your first and last profile can't be the same. Profile 1 and profile 8 are not the same profile. A surface going from profile 1 to profile 8 does not make a complete circle.

-jscott

Uncle Leo

09-04-2003, 04:54 AM

Well, personaly I like to start off with a poly cube then I smooth x3 on it, and start splitting faces, I find that is the best way for starting out with tires.......
or a revolve will work, what ever you like..

pohji

09-04-2003, 05:25 AM

WOW! I never thought of smoothing a poly cube to make a tire but it's working. I'm halfway there!

floid parkins

09-04-2003, 05:29 AM

hey I never thought of a that iof using a poly cubeit works great

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