View Full Version : How to do a sharp square hole in a subdivided surface

05-23-2017, 10:26 AM
Hi to everybody....I'm startin a project doing an old F1....
I'm building the main body patching from splines....
i've done the main body but now I've to realize the air intakes.....so I was wondering what is the best way to create them....
I don't want to use band saw pro because it will ruin the continuity and the shapes of the surfaces around the square hole....There is any other way?

I need to increase the polygon density?

Without using band saw pro i'm obtaining too soft and smoothie results


Sorry about my crappy english :(

05-23-2017, 10:39 AM
Smooth Shift (Shift + F) or Extrude (Shift+E)

05-23-2017, 10:43 AM
or Bevel polygon (b)....
each operate differntly. Because I'm used to other software, I select the polygon(s) then hit (b) and then switch to the transform tool.

05-23-2017, 11:00 AM
Your polygon density is fine. You just need to slide the inside edges closer to the border edges to hold the shape. You also will need to add an edge just inside the lip of the opening as well as outside.




05-23-2017, 11:35 AM
Thanks a lot!!!
Really, I mean it....THANKS A LOT

Ryan Roye
05-23-2017, 12:47 PM
Thanks a lot!!!
Really, I mean it....THANKS A LOT

Think of subdivided surfaces as being curves. The closer points are to eachother, the less opportunity subdivision has to "curve" the surface. If you make a cube, and use the bandsaw tools so that they cut the very edges of that cube, you'll see this concept in effect.

05-26-2017, 03:13 PM
If you DL and open the linked zip, extract, it is the entire LW wiki Subdivision Surface tutorial. They way it works is there are .html files in that folder, if you open them up within that folder, it will see the images and so the pages will look normal. The other page links don't work. So you have to open each page one by. But each page is actually a whole section of a tutorial or even one tutorial. So it is not that annoying. I will eventually get around to re-writing/formatting and releasing this as a tutorial. In the mean time. Make use of the data.


PS: hrgiger has it spot on :)

05-26-2017, 10:32 PM
All good advice above, but be careful about making the edges too sharp. Those kinds of vents' transitions are normally quite "smooth" to avoid generating turbulence around, or within the vent airflow.

05-27-2017, 05:02 AM
Use multishift, gives you much better control.

05-27-2017, 06:54 PM
Nice challange:

Sub-d off

Sub-d on

Test Render