SimplyMaya Forums

Welcome to the forum, feel free to ask questions here.

Home / forum / Lounges / Maya Basics & Newbie Lounge / Boolean -> Difference delets whole polygon?
Register FAQ Members List Calendar Mark Forums Read

New Thread
 
Thread Tools
Old 31-10-2008, 05:52 PM   #1
rudeboymcc
Registered User
 
Join Date: Oct 2008
Posts: 17
Thanks: 0
Thanked 0 Times in 0 Posts
Default Boolean -> Difference delets whole polygon?

HI. I'm trying to cut out a window for a house. The house is a polygon cube with some divided lines that i extruded to make a bay window.

I have tried selecting the house first then the window, and hte window then the house, and click boolean->difference but every time it deletes the whole house.

Wierd thing is, i have a version of the house just before i extruded all the bay windows and it works fine with that one (it's just a cube). In the new one i divided it loads and just added more edges. But I 'm not sure what i have done to cause this problem.

Anyone have any ideas?
rudeboymcc is offline   Reply With Quote
Old 31-10-2008, 06:07 PM   #2
BennyK
Registered User
 
BennyK's Avatar
 
Join Date: Oct 2007
Location: IL
Posts: 738
Thanks: 0
Thanked 3 Times in 3 Posts
Default

run a search in this forum with 'booleans disappear'
You should hit a few dozens at least...
You can find it n FAQs as well
Benny
__________________
When in doubt, delete history and freeze transformations.

My latest snake game
(Requires DirectX9 SDK and Framework)

Last edited by BennyK : 31-10-2008 at 06:09 PM.
BennyK is offline   Reply With Quote
Old 31-10-2008, 07:35 PM   #3
marlonjohn
Subscriber
 
Join Date: Feb 2006
Posts: 1,937
Thanks: 0
Thanked 8 Times in 8 Posts
Default

show us a picture, ill be glad to help ...

i love booleans ... lol! :p
marlonjohn is offline   Reply With Quote
Old 31-10-2008, 09:42 PM   #4
rudeboymcc
Registered User
 
Join Date: Oct 2008
Posts: 17
Thanks: 0
Thanked 0 Times in 0 Posts
Default

Ok turns out there was a secret hole in my cube under the roof so i couldn't see it.

so i managed to get one window sorted. then i copied the polygon i used, and select the face on the bottom and extruded it to make the window taller.

Then when i try to do the same boolean difference (on the same polygon) i get the window but also some odd black artifacts around it (like someone literally punched a whole in the wall).

what causes these?

I've attached a pic of it.
Attached Thumbnails
Click image for larger version

Name:	boolean.jpg
Views:	1090
Size:	131.2 KB
ID:	40614  
rudeboymcc is offline   Reply With Quote
Old 01-11-2008, 01:31 AM   #5
Chirone
Subscriber
 
Chirone's Avatar
 
Join Date: Dec 2007
Location: NZ
Posts: 3,125
Thanks: 11
Thanked 147 Times in 143 Posts
Default

either because you have multiple faces on there (which probably isn't the case for you)

most likely its because your faces aren't planer (flat along one axis)

solve this by drawing more edges

faces should be kept to 4 or 3 sided polygons where possible
__________________


that's a "Ch" pronounced as a "K"

Computer skills I should have:
Objective C, C#, Java, MEL. Python, C++, XML, JavaScript, XSLT, HTML, SQL, CSS, FXScript, Clips, SOAR, ActionScript, OpenGL, DirectX
Maya, XSI, Photoshop, AfterEffects, Motion, Illustrator, Flash, Swift3D
Chirone is offline   Reply With Quote
Old 01-11-2008, 01:49 AM   #6
rudeboymcc
Registered User
 
Join Date: Oct 2008
Posts: 17
Thanks: 0
Thanked 0 Times in 0 Posts
Default

OK i don't know what was wrong with it but I used "set to face" and it fixed it.

Now i'm having more issues with the same face. I've got the windows and now i want to draw a horizontal edge at the base of each window for a window sill (that spans across the walls as well).

So i used the split polygon tool to draw more edges, turn snap to curve on. and i can draw the line ok, but when i press enter it covers up some windows. (i.e. the window indent is still there, it's just covered up by a face in front of it).

I don't understand where this face comes from when i only add an edge.

I've added a pic of the problem. THe orange edge is the one i've just added, and it's caused two windows to be "covered".

EDIT: ok i've played around some more, and the same thing happens if i cut the face in half. i'm guessing when i split polygon i'm doing the same thing.
Attached Thumbnails
Click image for larger version

Name:	untitled-1.jpg
Views:	1082
Size:	55.2 KB
ID:	40617  

Last edited by rudeboymcc : 01-11-2008 at 01:54 AM.
rudeboymcc is offline   Reply With Quote
Old 02-11-2008, 10:47 AM   #7
Chirone
Subscriber
 
Chirone's Avatar
 
Join Date: Dec 2007
Location: NZ
Posts: 3,125
Thanks: 11
Thanked 147 Times in 143 Posts
Default

try delete all history
__________________


that's a "Ch" pronounced as a "K"

Computer skills I should have:
Objective C, C#, Java, MEL. Python, C++, XML, JavaScript, XSLT, HTML, SQL, CSS, FXScript, Clips, SOAR, ActionScript, OpenGL, DirectX
Maya, XSI, Photoshop, AfterEffects, Motion, Illustrator, Flash, Swift3D
Chirone is offline   Reply With Quote
Old 06-11-2008, 02:37 AM   #8
marlonjohn
Subscriber
 
Join Date: Feb 2006
Posts: 1,937
Thanks: 0
Thanked 8 Times in 8 Posts
Default

the reason why the new faces keep appearing is because the window isn't connected to the outer edge/box. all vertex's need to be connecting to something. Booleans are abit of a pain when you work with cyclinders with lots of vertices.



the reason why that wierd line is happening is because there are extra vertices which are not needed and creating stretch in your mesh. you may need to move some vertex's as they will be hiding underneath each other



hope this helps abit

Last edited by marlonjohn : 06-11-2008 at 02:43 AM.
marlonjohn is offline   Reply With Quote
New Thread

« Previous Thread | Next Thread »

Thread Tools

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

vB code is On
Smilies are On
[IMG] code is On
HTML code is Off

1 Month

$34

Month-to-month billing
$34/month
Unlimited access to all videos
Project files to download
Easy to cancel at anytime
 
 

3 months

$87

Billing every 3 months
$29/month
Unlimited access to all videos
Project files to download
Easy to cancel at anytime
Save $5 per month or $15 in total compared to monthly billing with this package.

12 months

$288

Billing every 12 months
$24/month
Unlimited access to all videos
Project files to download
Easy to cancel at anytime
Save $10 per month or $120 in total compared to monthly billing with this package.

Your plan will automatically renew. You can cancel at any time via your PayPal account to avoid being charged again.

You can view the FAQ on our video plans here. You can contact us directly here. By clicking one of the buttons above, you agree to our Terms and Privacy Policy.