For those interested: Here is the link to the 3DM file for you to play around with.

http://www.mediafire.com/file/v83iha5yi0ux28k/School_Chair_Tutorial_Model.3dm

http://www.mediafire.com/file/998hfijwt1y9jfi/chair05.3dm (for some base elements)

Main Folder: https://www.mediafire.com/folder/3tlre2zc6y1qh/MoI


Please feel free to do some nice renders! ;-) I'm thinking "1980's" school room, badly maintained floor tiles and those things we used to call "black boards".
Some 'ABC' gum under the chair frame, and some scratched graffiti in the back shell plastic would be a nice touch.

 

Thanks Michael!

Yes, I suspect that MoI is having trouble negotiating between objects that are quite different.

I'm even having problems getting them to Loft straight when stacked.

I've tried to "flip" different profiles, Rebuild them and even Mirror them, but Sweep seems to have a mind of its own, which I why I took the more complex route.

Here is the link to the "sausage-link" file:

http://www.mediafire.com/file/t3tf6yt68ggh07s/School_Chair_Tutorial_Sweep-Issue_01.3dm

Hi Mike, thanks for sending the sausage file.

In this case it's the segmented nature of those concave sections that's causing the problem, it looks like there is probably some uneven parameterization in some segments, which is not good for the seam matcher.

It's probably something that I can fix up, but an easy solution for the moment is to select all those sweep profiles and run Rebuild on them, the rebuilt curves have better parameterization and the rebuilt ones should all sweep fine.

- Michael

I could only think of one addition for the render....

Burr... I get your point! ;-)

Michael... My thought as well on the rebuild. I think I tried it at one point but was still dealing with the odd inverting effect.
So if everything was evened out as far as 'weighting' and 'parameterization' would the start-point position of a closed curve still effect the outcome?

Hi Mike,

> Michael... My thought as well on the rebuild. I think I tried it at one point
> but was still dealing with the odd inverting effect.

Well, on the particular file that you sent (School_Chair_Tutorial_Sweep-Issue_01.3dm) if you do a rebuild it doesn't invert anymore...


> So if everything was evened out as far as 'weighting' and 'parameterization'
> would the start-point position of a closed curve still effect the outcome?

No, not really. That's sort of the whole point to the automatic seam matching, that it tries to get things lined up ok without you needing to have to worry about aligning all the start points yourself manually.

And actually on the messed up one it's not the start points that's really messed up, it's the direction, one is flipped where it shouldn't be.

But I'm fairly sure it's because the connection lines that are used for twist minimization are not getting dispersed very evenly across the segmented curve, that's what the uneven parameterization can cause.

- Michael

Aha! That worked Michael, thanks!

And easier still, I was able to rebuild all the profiles in place in one Rebuild operation.

Well if tutorials are good for one thing, it's education. ;-)

Hi Mike, I'm looking into doing some changes in the seam matcher thingy to test samples separated by arc length (by distance traveled along the curve) instead of by traveling in parameter space, that should hopefully make the original case work without any rebuild. The only tricky part is that traveling by arc length along a curve requires more computation, it's not as simple as traveling by parameter values.

- Michael

Ah a very cool precise one!

French translation will be made the next month in June ;)

Good job Mike. I love to see your workflow and technique - so clean and pure. Sure you get the odd glitch, but your style is just so darn good!

Martin Spencer-Ford

Michael... Thanks. I'll be sure to test-drive the enhancement. If it's like the "Uniform" mode in Network (which I use a lot), it may yield some nice results.

Pilou... Très bon. Comme le fromage parfait et le vin, il doit prendre le temps. Je suis très reconnaissant pour votre contribution. ;-)


Martin... Thanks for the compliment! MoI just simply lends itself to a good pleasant workflow.

I hope the step-by-step snapshots teach well enough.

Mike-

Is it ok to say in this forum that I love you and hate you at the same time? I love your tutorials, I use them (and your website) frequently as reference. I kind of hate you (ok, not really) because you make things look so simple and easy. You are, indeed, one of those that I'd consider a MoI Jedi. Thank-you for taking the time to put these tutorials together and for sharing them with the forum. I know that I benefit greatly from them.

Michael C...

Thank you for your really great compliment! That really brightened my day. :-)

I'm really glad that, especially you, as well as others value the techniques I have to show.
I'm just a tee-shirt artist by day, but don't you get to work with really cool packaging design?

There's a part of me that enjoys sharing instructional knowledge with others.
They call me an "Elmer" in the ham radio circles.

Michael G. has done such a great job at developing MoI to be so bluntly simple to use and intuitive that I feel that anyone with a little training can realize their hidden CAD talents.
Notice how all I have to do is show one of the few icon symbols and the rest speaks for itself?

Dang Mike - your tutorials get better each time. You definitely earned your black belt in MoI.

That chair brings back memories. Especially the times I had to sit in it facing the corner in 4th grade.

Ed

Wow really great modeling and tutorial !

I learned new things :)

Thanks !

Here ya go Mike. Your chairs modeled in KeyShot against a meeting room HDR.

Click image to view full size.

Ed

Ed, thank you!!! They're so realistic, it's spooky.

Even the colors.... ahh the memories... no... no... flashbacks!.... awful flashbacks!

Thanks Mike. I had my share of "ass time" in those chairs too.

Yeah - KeyShot now has a color picker eye-drop tool built into their material editor. Just open the website for the chair mfg., pop open their color selection options, take a sample - done.

KeyShot also now has Mold-Tech plastic textures, so I picked one based on memory.

I think my camera focal length doesn't quite match the background, but it's just a quick and dirty render. It sure helps to have a realistic model to work with!

Ed

Hi Mike, ok I've got the curve seam matcher thing fixed up for the next release so that sausage sweep case will work correctly without needing to do any rebuild step before doing the sweep. Thanks for digging out the file so I could reproduce the problem over here!


> If it's like the "Uniform" mode in Network (which I use a lot), it may yield some nice results.

Basically the fix just helps to avoid the seam matcher from getting confused with certain kinds of control point spacing on some kinds of curves.

- Michael

Ed:good shot !


Thanks Mike for your model and for tutorial
no dubts:Flow tool is the real milestone for us,freeform modelers,in Moi3D !



I'm sorry,i'm not able to do that kind of renders...anyway what you describe as an "heavy duty" popular chair,can be still actual and cool changing colors and materials
this is an idea using an advanced material in Arion Render: polyurethane plastic (diff+transparent+sss),it needs to clean more noise on image,but it's just a try

M

That's a cool material, M! Where in the heck were our cool translucent chairs?

They would have been all the rage back in the '90's when Apple made everything 'see-thru'.

Reminds me of the orange transparent acrylic chairs at a local frozen yogurt shop.