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How To Locate Geometry Errors
- By Dan Hill
- Published 17 August 2005
- Error Messages
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Rating:
Summary and References
Geometry Errors are issued whenever ZEMAX is not sure how to trace a ray. Common reasons involve ambiguity or error in how objects and surfaces are positioned in ZEMAX. Some examples include:
- Invalid Placement of Entry and Exit Ports in a hybrid mode.
- Invalid Placement of Non-Sequential Sources
- Invalid Construction of Solid Objects
You can use geometry errors that are issued to track down problems with the definition of your optical system. Sometimes, geometry errors cannot be eliminated completely, and it is perfectly acceptable to have a few rays fail. Typically, the error associated with these errors is minimal, and can be ignored.
If interested in following through some examples which detect and diagnose geometry errors, you may read part II of this two part series:
Design Examples: How To Locate Geometry Errors Part II
References
ZEMAX Optical Design Program User's Guide, ZEMAX Development Corporation
9 Responses to "How To Locate Geometry Errors" 
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said this on 23 Sep 2006 3:54:09 PM PDT
Enjoyed very much to read the article. Clarified a lot to me about those problems
You should give some pointer when geometry error occurs to these articles.
This will save lot of questions.
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said this on 13 Oct 2006 8:31:26 AM PDT
Hi Micha,
We now do this: when a Geometry Error occurs, the warning dialog offers to open this article. - Mark
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said this on 26 Feb 2007 7:55:32 AM PDT
Great - gave me the steps to track down the error. And how to turn off the error messages.
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said this on 22 Mar 2007 4:07:36 AM PDT
I wonder if you could tell how to switch the error messages off when using a universal plot.
{Editor's Note: its best to fix the geometry errors first, but you can still use the 'Ignore Errors' switch under Tools in the NSCE.}
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said this on 23 Mar 2007 12:25:53 PM PDT
Good article. Would have been better if you explored a detailed example where a geometry error was detected and you went through the steps to diagnose and correct it.
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said this on 18 Apr 2007 11:53:32 PM PDT
To really appreciate the article it would have been necessary to clarify the subject on two or three common simple examples.
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said this on 12 Jan 2008 6:07:57 AM PDT
really great article !
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said this on 16 Jul 2008 9:29:56 AM PDT
Valuable article. I often get errors on imported objects (i.e. step & iges).
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said this on 16 Jul 2008 10:46:55 AM PDT
Hi John,
In that case, see also http://www.zemax.com/kb/articles/251/1/Tips-and-Tricks-for-Successful-CAD-Import/Page1.html
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