Tire Boolean Problem

[shilpinator]

Hey there everyone!
My first post/thread here on SMcars lol

Well i use Rhino as my main modelling program, and i was having a problem while trying to make this tire.
What Im trying to do is a boolean difference for the treads of the tire. Usually ive done a boolean union and modelled the opposite part of the tire, but i thought that it would look more realistic this way.
Now, the problem is, that whenever i tell it to do a boolean difference with ALL of the pieces at once, the majority of the pieces dont end up making a proper boolean. (also it takes like 5 hours at least lol) . But if i take each piece one by one, it works, but that takes waay too long. My point is that it should work if i select all of them, right?
i tried to do it many times, i even make all the surfaces again, but no luck.
how can i get this to work ? lol
Im pretty much a noob,
so any help is much appreciated

(PS: and yes i have made sure that each surface is intersecting with the large surface )

[tom120934]

Hi shilpinator, welcome to SMC, I hope you'll enjoy your stay here.

About boolean modifiers, I'm not a Rhino user, but I think booleans are useless in almost every single 3D software : they almost always create terrible mesh, and you'd better go for modeling the tire by yourself, it's not so hard. Once I wrote a tutorial about it : Pixels or Atoms ? It was written for Blender, but pictures are self explanatory for being used for any other 3D modeler.

[strg-alt-del]

Hi and wellcome, shilpinator!
Yes, you have to do a workaround...
Try this: count the tread-parts of your tire and create only one of it! Than use Polar-Array to get it X-times. Create a "basic-surface" (yellow thing in the picture, use rvolve-command) and cut your tread-piece in it. Now you can select 1/4 of your pieces (for example) in one step.
Rhino sometimes has problems to handle a huge amount of pieces at one time.

[smoker]

Boolean operations may give problems with polygon models, but they work like a charm in NURBs apps, like Rhino (or StudioTools, Inventor, SolidEdge and others).

You can have those tire treads done in many different ways. A common practice in Rhino is to build a single tread pattern, then (one dimension) array it to get the total number of strips pr treads of the tire, and finally use the bend tool (360 degrees to get a perfect cylinder).

There are many other ways though, like using pure booleans, like you are doing. You may continue with that approach, making the boolean operation with less geometry selected, repeating as necessary and deleting unwanted remaining geometry.

As an example, the geometry showed on pic is a pattern bended to a surface.

Good luck!

[strg-alt-del]

Oh, I never tryed this. looks good!

Problem in Rhino is, you can`t see the step of progress during Rhino is working on a command . You don`t know how long it takes till ending the process, means, did Rhino still work or is Rhino allready break down ?!

Maybe it is the processor or the ram that pulls it down.

Some other Progs like ACAD show a rotating slash during processing so you can see the progress of work.

[smoker]

Originally Posted by strg-alt-del

Oh, I never tryed this. looks good!

Problem in Rhino is, you can`t see the step of progress during Rhino is working on a command . You don`t know how long it takes till ending the process, means, did Rhino still work or is Rhino allready break down ?!

Maybe it is the processor or the ram that pulls it down.

Some other Progs like ACAD show a rotating slash during processing so you can see the progress of work.

That's true. Rhino just show the "busy" mouse pointer (ie: hourglass) and you have no other clue on what is going on. Fortunately, pressing scape key stops almost any command/operation cleanly.

In the case of the Bend operation, it should not take much time, if geometry to be bended is set to rigid (if not, it may take some time if geometry to bend if somewhat complex or "dense").

Cheers, Joe.

[shilpinator]

Wow!
Thanks for all the quick replies guys! And for the welcomes
sorry I couldn’t get back to you earlier,,

@tom – like smoker said, rhino is usually good with Booleans, unlike max for example. Also, thanks for the tut, even thought that is for poly modeling, I could still do it with curves and extruding. But that is for making the part of the tread that sticks up out of the tire. The effect that I was trying for this particular tire was to make the parts that cut into the tire (the opposite parts). But thanks anyways lol

@strg-alt-del – well that’s almost what I did: I made one of the tread, and polar arrayed it 55 times. But for the surface, I was using a filleted tube, instead of a revolved surface. So I tried using a revolved surface like you said, but the Boolean always failed for me for some reason lol. And like you said to only select ¼ of the pieces at once, for this tire, even if I select around 4 – 5 pieces, some get messed up. So I had to do them all 1 by 1

@smoker – and thanks to you also, but again your method is for creating the opposite part of the tread than what I am trying to achieve. (or maybe I understood wrong .. well doesn’t matter anyways )

So what happened was: I re-made all of the extruded surfaces, and then I had to do a Boolean difference with each piece ONE BY ONE lol it took well over a full day …
so anyways,, I finished the tire ( I think )
any crits are welcome, oh and the mat. obvs needs work (any tips?)
rendered in max(last 2)

(oh and I might post a pic later with a rim and brakes just to show the tire off )

Oh And Thanks Again
rly apreciate it

[shilpinator]

Hey there everyone! like i said in my previous post about adding pics with the tires in use with *finished* rims n brakes : here they are ! lol

i say *finished* because i will always take critz on how to improve them
i know some things are iffy in the renders, such as : the graininess in the highligts of the rims, some glitches in the mesh (although that is not my fault, its because of importing it from rhino by .3ds ) and the lack of light going in to the brake disc and caliper ( not sure how to fix that,, i tried increasing the diffuse bounces, but that made there be less shadow on the model and made it look overall washed a bit ) so any help on those things would be great lol and on anything else

PS : i was soooo shocking at the render times of these renders :O 10 mins for the clays (which is higher than usual for me lol) and ~over an HOUR for the other two coloured ones :O :O :O :O lol
hahha but when you look at the 5th pic, you kinda realise why **1,748,532 polys**
although i dunno how comparable that is, because i obvs imported this into max FROM rhino, which always has bad meshes,, lol

PPS: oh and i hope i havent broken any posting rule for this sub-forum: i just wanted to let you guys know how it turned out