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AcroDave120
10-01-2008, 02:19 AM
I am making a simple still model of a fish tank, but I need to know how to cut a circular hole in a polygon surface. I saw the "Cut Hole Tool" but I can't figure out how to get it to work. I am trying to Make a circular tunnel in a flat face. I thought about trying to use a poly cylinder and combine the top faces with the flat front face of my box. Combine the 2 somehow, and then push them back in to create a cylindrical hole "Cave." Any Suggestions on how to cut a hole like a hole saw? LOL Any good tutorials on the cut hole tool?

Thanks,
Dave
DanBroughton
10-01-2008, 05:20 PM
Probably the easiest way that I can think of is to create a cylinder as you have and then Boolean the cylinder from the polygon surface. This is in the polygons module, mesh menu > Boolean > difference. Making sure you selected your poly shape first then the cylinder.

Hope this helps

Dan
pYcHan
10-02-2008, 08:09 AM
http://img60.imageshack.us/img60/1985/holego3.jpg

something like this? Just chamfer 2 time.. the first time is pick a vertex..then it create 3 vertex..select the 3 and chamfer again..and you get a perfect hole..the attached part..i think you can extrude.. =)
johnnymoha
10-06-2008, 10:42 PM
The pictured above method will work fine if you dont mind having tri's around the hole. Booleans are also good and you can fix the surface afterward to keep it in quads or you can just use the split polygon tool. Its my best friend.
mithril-hawk
10-07-2008, 04:11 AM
pYcHan has a good solution for a low polygon count object, and a boolean intersection will work if you are not using a subdivision surface.

I found the following technique from an excellent 2 part video series on hard surface modeling fundamentals but I can not remember where I saw them. :sad:

http://i264.photobucket.com/albums/ii183/Qxygen/polygon_cut_circular_hole.png
AcroDave120
10-07-2008, 04:46 AM
Johnny,

I figure just use the split poly tool as well. How many split poly's do you think you would use to het a good smoothing? For something like a 1 and 3/4 hole?
johnnymoha
10-07-2008, 09:01 AM
If your not working on this for a game, I would say you would only need an eight sided hole exactly like in Mithril-hawk's picture. Thats the best way to split it too cause you stay in quads for your smoothing.
Mikademius
10-07-2008, 06:11 PM
Sometimes you can think in reverse you know ;)
A hole is just an inverted cylinder. I answered the same question in another thred a while back. Here is the link:

http://forums.cgsociety.org/showthread.php?f=25&t=477132&highlight=booleans+mental+ray

However, you should probably clean the mesh a little after you come to my last stop there ;)
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