How to make rectengulare hole in subsurfaced cylinder?

HOW TO MAKE RECTENGULARE HOLE IN SUBSURFACED CYLINDER?
Hi guys,
I want to make a rectunglar slit in this cylinder which is subsurface modified like the ref Image.
Problem is When I select faces and try to make slit the slit become ovel shaped and when I try to use support loop to flaten the ends of slit the shape of cylender distorted. What to do? (I used Inset too but same problem of distorting the shape of cylinder.)




Try to take advantage of the crease feature. It basically tells the maodifier how much to round the edges. Tipically you should set the crease to 1 to the edges you want to be straight

Seems this solution is not working for me the distortion is still there …




I don’t think you’re going to be able to avoid some sort of distortion if you want sharp edges. You could try using cuts around the boundaries of the object. Here’s a little test object I did, dunno if it helps at all.

Attachments

TestCylSharpCut.blend (1.32 MB)

Actually, I have started on the promised version for Blender. But check out the link in my sig for some ideas until I get it done.

This page:

https://docs.lightwave3d.com/display/LW2018/Subpatch+Modeling+-+Five

https://docs.lightwave3d.com/download/attachments/1860606/SquareInTube12.png?version=1&modificationDate=1498292524000&api=v2

A simple trick is to add more geometry around the curved surface to support the hole. Another cool trick is to use bevel modifier + weights instead of support loops.

Yes, more control geometry


As far as I can understand from the solutions you all have suggested that I needed more details in geometry to achieve what I intended to. Thanks Guys

Yep. It is an important thing to learn about Subdivision Surface Modeling.

https://docs.lightwave3d.com/display/LW2018/Subpatch+Modeling+-+Five

Now a problem occurs with this one.

This is because we need more geometry to hold the shape. We are getting too much bumping with this little geometry because the 5 poly points are creating too much draw on the surrounding points. Remember about motion and weak joints.

This is harsh on the curved surface.

So to get a smooth surface on a curve and also have 5 poly points - unavoidable to create any kind of complex detail - we simply need more geometry.

Just that be warned. You should be careful and balance this as needed. Don’t overboard and create more than necessary. And with cylindrical shapes try and plan this before hand so you don’t need to create uneven loops, loops that split one loop in half that make the cylinder flat in places. You can correct this of course. But it is better to plan to avoid it.

JA12 shows a perfect example. You could even try 32 and see how that works.