14th November 2005, 09:07 AM | #1 |
Junior Member
Junior member
Join Date: Nov 2005
Location: UK
Posts: 5
|
Holes in Objects
I am new to AC3d and am finding it difficult to put a hole in an object.
The "Make Hole" seems to put a hole of the same shape as the object ie a % of the object ie a square hole in square object and round hole in a round one. Can any one tell me how to "drill" a round hole into an Object of whatever shape |
14th November 2005, 01:47 PM | #2 |
Senior Member
Professional user
Join Date: Feb 2004
Location: Portland, OR
Posts: 604
|
"Make Hole" uses the shape of the surface itself to base the hole on, and you set the % of the area that makes up the hole.
If you want a different shaped hole in a particular object or surface, you may have to rely on a Boolean operation to do this. It's "messy" and might not be worth it for you, but basically... 1) Create a poly in the shape of the hole you want, 2) Extrude the poly 3) Position the new "cutout" poly such that it intersects the item you wish to create the hole in, and assign both two-sided surfaces. 4) Do a Boolean subtraction, B-A, using the "hole-shaped item" as A and the item you wish to create the hole in as B; set the Boolean subraction to NOT save the original items. (Remember, if it doesn't work the way you want, you can Undo the operation [or change the operands] until you do get it right). After you perform the Boolean, you may have to do a LOT of cleanup of inadvertent leftover polys, and stuff on the "inside" of the object. Booleans can also cause the creation of new polys and triangles around the edges of a hole that are, to put it mildly, inefficient. For these reasons alone, it might be better for you to use "Add vertice" operations on the surface to manually "outline" the area you wish to cut out of an object, then delete the area. You might even use an intersecting object (as outlined above, stopping short of doing the boolean) as a temporary guide to help you accurately place the new vertices for a manual cut.
__________________
Flight Sim Project Contributor My Gaming Rig: i5 2500K Quad-Core CPU at 3.3GHz MSI P67A-C43 mobo 4GB of PC12800 DDR3 memory Windows 7 1GB Galaxy GeForce GTX550 Ti video card GeForce 270.61 drivers (4/2011) Cougar joystick/throttle combo CH Pedals |
14th November 2005, 02:51 PM | #3 |
Senior Member
Professional user
Join Date: Jul 2003
Posts: 899
|
Stiglr is right on track here --- Andy also posted a visual tutorial on making a round hole in a rectangle:
http://www.ac3d.org/forum/viewtopic.php?t=1012 |
15th November 2005, 05:53 AM | #4 |
Junior Member
Junior member
Join Date: Nov 2005
Location: UK
Posts: 5
|
Holes in Objects
Great, Thanks for the Help Dennis and Stiglr.
Its good to get such a prompt helpful reply. Keep up the good work David |
20th July 2015, 05:15 PM | #5 | |
Member
Expert member
Join Date: Feb 2012
Posts: 58
|
Re: Holes in Objects
Quote:
is this available? how can I drill a bolt hole in a cube? I don't want the hole to go all the way through the cube. and I also want a hole all the way through the cube. |
|
20th July 2015, 06:07 PM | #6 |
Member
Expert member
Join Date: Feb 2012
Posts: 58
|
Re: Holes in Objects
this is driving me crazy. how can I drill a drainage hole through the all the surfaces? the cylinder represents where I want the hole to go. I made the fins rack with the polygon tool and then extruded, and the cylinder is the circle polygon and then extruded. I set the tools to object mode, then I click on the rack, then I add the cylinder, and then I do object->boolean-> subtract, but its all messed up. Whats the right way to do this?
Last edited by jleslie; 20th July 2015 at 06:09 PM. |
23rd July 2015, 05:58 AM | #7 |
Administrator
Professional user
Join Date: Jun 2003
Posts: 4,565
|
Re: Holes in Objects
From looking at your result in AC3D, it appears that some of your surfaces are facing the wrong way.
I can tell this by setting all surfaces to 1S (single -sided) and looking around the object. If surfaces 'disappear' then they are the wrong way around. For booleans to have any chance of working, you need to get all normals facing outwards on all objects used. To fix the original, select one surface (that you know is facing correctly), and use Surface->Unify-normals. |
23rd July 2015, 08:58 AM | #8 | |
Member
Expert member
Join Date: Feb 2012
Posts: 58
|
Re: Holes in Objects
Quote:
|
|
24th July 2015, 11:30 AM | #9 |
Member
Expert member
Join Date: Feb 2012
Posts: 58
|
Re: Holes in Objects
Andy,
It worked! thanks again. I was able to make the exact drill hole I wanted. I am confused about the exact layout I needed for the surface face though. as shown in image1 in the yellow circle. I had to have the surfaces of the cylinder from 9:51 to 5:30 facing outward, and from 5:31 to 9:50 facing in to get it to work. I did it by trial and error, but is there a more logical way to decide? |
27th July 2015, 07:43 AM | #10 |
Administrator
Professional user
Join Date: Jun 2003
Posts: 4,565
|
Re: Holes in Objects
All surfaces should face outwards - that way, the boolean operations know what's 'inside' or 'outside'.
You should probably check the result more carefully. Switch it to single sided and you may see holes where the cylinder surfaces that were wrong touched the main object. You might want to check the objects for leaky surfaces before you do the boolean too. Any holes, even if they are hard to see, can cause problems with the boolean ops. |
Thread Tools | |
Display Modes | |
|
|