SubD examples and models

HornOxx

@pilou said:

That is excellent!

@box said:

I blame that Hornie Ox up there.

@thomthom said:

Just waiting for the minion to become SketchUp's "teapot". ...

@aarondietzen said:

...

Thanks, to all of you posting SubD-stuff & knowledge here in Cotty´s great thread
@Box - on your Manifold model, somewhere up there, I have broken my teeth !!!

cotty

It's not my topic, it's a great community topic...

optimaforever

btw sometimes when I open a skp with a subd-ed mesh in it, the mesh is invisible (but it's definitely there, as you can select a hollow box and it becomes visible if you toggle the subdivision off)...

Is there a fix for this? what causes this?

olishea

My Sub D experimentation is under way

Box

I've notice a few people I have talked to and read in some post that there is a misconception that SubD isn't well suited to accurate or specific dimensions.
I modeled this as an example of an organic shape flowing into a very accurate connector. This would fit onto the other side of the connector I modeled it from. Right down to the 6.2mm holes to take 6mm contersunk engineering bolt.
This is all one piece and is a solid.

Proxymouth 40mm.skp

pilou

Cool result!
What is the render engine used ?

Box

Twilight Hobby.

HornOxx

@box said:

...I modeled this as an example of an organic shape flowing into a very accurate connector. This would fit onto the other side of the connector I modeled it from. Right down to the 6.2mm holes to take 6mm contersunk engineering bolt...

That´s a good hint and a nice example as well! (I thought of any new B & O speakers )
Did you use the normal SU move tool for to snap and fix these exact points then?

Box

@hornoxx said:

Did you use the normal SU move tool for to snap and fix these exact points then?

It doesn't really matter how you arrive at the shapes, it's just a matter of using the crease tool to lock them in place.
So if you draw a circle with the normal 24 sides and extrude and expand etc etc but crease the original border of the circle, the hole created by that circle even after subding will be the same as when you created it. So you can happily draw accurate sizes and keep them in the same piece as heavily deformed shapes. Which makes it easier for creating 3d printables.
Mind you, there is no reason I couldn't make the fitting and the "mouth" shape separate pieces, and using the same logic mate them together perfectly via creasing.

thomthom

@optimaforever said:

btw sometimes when I open a skp with a subd-ed mesh in it, the mesh is invisible (but it's definitely there, as you can select a hollow box and it becomes visible if you toggle the subdivision off)...

Is there a fix for this? what causes this?

Do you have such a model you can share?
And the mesh isn't missing when you save? It could either be some extension that do something to the model when it saves. Or could it be a graphic card issue?
Do you ever get a SUbD error dialog?

HornOxx

@optimaforever said:

... again a ... question:
to get these topologies (Cut Face A and B), is there a specific tool or can I draw them the usual way with QFT line tool?

... that´s a good question and thanks for your useful picture - in 2D, these "curved direction changes" can be drawn with basic SU tools.
As they are so useful, I´ll add them here if someone wants to use them as "instant groups"

Basic_Geometry1.skp