Assura DRC: How to Define derived layers

Hi Stu,

I don't work with Assura myself, but a few of my colleagues have stated that there does not appear to be any issue with the line of code as it is, but:

1) Ensure that the statement is in the Rules section, not in the layerDefs section

2) Ensure that the preceeding statement(s) do not have any errors

One of my colleagues supplied the following sample rules file:

drcExtractRules(

  layerDefs( "df2"
    VIA2 = layer( "VIA2" )
  );end df2 layerDefs section

  layerDefs( "gds2"
    VIA2 = layer( 14 )
  );end gds2 layerDefs section

  newVia2_a = geomSize( VIA2 0.07 )
  errorLayer( newVia2_a "Enlarged VIA2" )

);end drcExtractRules

This compiles correctly.

I hope that the above information helps you, if not, you may need to send us your rules file for further assistance.

Regards,

Lawrence.

Hi Lawrence, it was indeed an error in a preceeding statement, thanks for your help.

Cheers

Stu 

Hi Lawrence, 

can you(or anyone out there) please ask the Assura guys if you cannot perform geomAnd on derived layers, so for example this would not work:

 drcExtractRules(

layerDefs( "df2"

      OD          = layer( "OD" )

); end df2 layerDefs

    OD_1         = geomSize( OD 0.005 )
    OD_2        = geomAnd( OD_1 )
    saveDerived( OD_2 "TESTING OD_2 ")

)

This fails with:

 error:  No such original or unmerged layer 'OD_1'.

When  i change the geomAnd to geomOr the code compiles (though of course its not what i want functionally).

I read in the assura manual regarding geomAnd:

" Description
Generates new shapes from the overlap of original shapes on the input layers."

So this perhaps infers that you indeed cannot geomAnd derived shapes?

Cheers

Stu

Stu,

You can of course use geomAnd on derived layers, but in this case you are trying to use geomAnd with a single layer - normally it would be done geomAnd(layer1 layer2) for example.

If you want to use the single-layer form of geomAnd, that means you're trying to do a selfLayer and - to quote the geomAnd documentation it says:

A selfAnd operation is performed by providing a single unmerged layer as input. An unmerged polygon layer is either an original graphics layer or the unmerged output of a geomSize command (see "geomSize").

A self-and means that it will and the shapes with shapes from the same layer - that only makes sense if the data is unmerged, because otherwise you'll always get nothing.

So what you'd do so:

    OD_1         = geomSize( OD 0.005 unmerged )
    OD_2        = geomAnd( OD_1 )
    saveDerived( OD_2 "TESTING OD_2 ")

Note the "unmerged" keyword in the geomSize function. If you do this, it will find any gaps less than 0.01 wide between OD and other OD, or any self-overlapping bits of OD. Whether that is what you really want, I don't know...

Regards,

Andrew.

Hi Andrew, thanks for the indepth reply, it was very useful.

Stuart