Boolean Problem

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  09 September 2012
Boolean Problem

Hello Everybody:

Hope someone can point me in the right direction to fix this.
I'm trying to model a coffee cup with lid and I'm having problem with the lid part.



Bigger version here

I created a revolve object as the main volume for the lid. And just wanted to carve away 2 holes with a boolean operation. But I'm not getting a good result. The Negative/hole part is a loft NURBS and the Main volume is a revolve object.

When I render I'm loosing the vertical walls. I created a simpler version with a cylinder to test my idea and it works ok there.

Any idea why I'm not getting the expected result?

Thanks in advance.
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Fernando J. Velarde

www.velarde.com
 
  09 September 2012
Your cup lid is not a closed volume, while the cylinder is.

You would need to perform the boole on a closed volume.
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  09 September 2012
Originally Posted by chi: Your cup lid is not a closed volume, while the cylinder is.

You would need to perform the boole on a closed volume.


Hello Patrick.

Thanks for the quick response. I believe it is closed. I have a bottom. Or am I misunderstanding what you mean?



Thanks!
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Fernando J. Velarde

www.velarde.com
 
  09 September 2012
Just a wild guess - but could it be a reversed normals issue?
 
  09 September 2012
When you lathe / revolve the cap you should create an outline so that thickness is built into
the shape. Then, when you boole the cutout there will be thickness and solidity.

OR,

If you want the shelf opening, put the same texture on the boole object so it renders the inner profile.

Edit: Detailed lid
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Last edited by vid2k2 : 09 September 2012 at 03:59 PM.
 
  09 September 2012
Couldn't tell from your angle
Post a file then..maybe people seeing the geo will be better than a single image.

I can't recreate your issue on my end when I try.
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The views expressed in this post are by no means the opinion of those making the post or of any one person in particular.
 
  09 September 2012
Perhaps the end points on your profile for the cup are not perfectly aligned and set to 0 on the x or z. (which ever axes you are using)
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The views expressed in this post are by no means the opinion of those making the post or of any one person in particular.
 
  09 September 2012
Thanks guys for all the quick ideas , I'll check the suggestions and see where the problem is.

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Fernando J. Velarde

www.velarde.com
 
  09 September 2012
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