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How to get all voids on conductor layer?

khuranav007

What is the best way or methodology to obtain all voids (lack of metal) on a conductor layer?

I tried to use the following polygon->holes like shown below but it does not get all voids (lack of metal).

shpAbovePoly = car(axlPolyFromDB(shpAbove))
shpAbovePolyHoles = shpAbovePoly->holes

Voids in orange box are desired.

Thanks for help.

Parents
  • Hoangkhoipcb
    0

    Hi Khuranav,

    You can refer to the code below.

    defun(get_voids ()
        let(()
            void_list = nil
            foreach(shape setof(e axlDBGetShapes(axlMapClassName("ETCH/TOP")) e->net->name != "")
                voids = shape->voids
                if(voids then void_list = append(void_list voids))
            )
            axlHighlightObject(void_list)
            printf("%d voids in the TOP layer\n" length(void_list))
        )
       
    )

    Regards,

    HoangKhoi.
  • khuranav007
    0 in reply to Hoangkhoipcb

    Thank you for the response.

    But shape->void only appears to work when void is fully 'surrounded' by the shape.

    Meaning, when void (if you draw a void) is enclosed by the shape otherwise shape->void does not identify areas where there is no metal.

    I think I will have to use axlPolyOperation() after getting all metal on each layer.

    Let me know if there's a better way.

    Thanks again.

  • Hoangkhoipcb
    0 in reply to khuranav007
    I think using this axlPolyOperation() will take more time.

    you try to run this code again.

    defun    (get_voids ()
        let(()
            void_list = nil
            foreach(shape setof(e axlDBGetShapes(axlMapClassName("ETCH/TOP")) e->net->name != "")
                voids = shape->voids
                if(voids then void_list = append(void_list voids))
                if(shape->shapeBoundary != nil then void_list = append(void_list shape->shapeBoundary->voids))
            )
            axlHighlightObject(void_list)
            printf("%d voids in the TOP layer\n" length(void_list))
        )
       
    )
Reply
  • Hoangkhoipcb
    0 in reply to khuranav007
    I think using this axlPolyOperation() will take more time.

    you try to run this code again.

    defun    (get_voids ()
        let(()
            void_list = nil
            foreach(shape setof(e axlDBGetShapes(axlMapClassName("ETCH/TOP")) e->net->name != "")
                voids = shape->voids
                if(voids then void_list = append(void_list voids))
                if(shape->shapeBoundary != nil then void_list = append(void_list shape->shapeBoundary->voids))
            )
            axlHighlightObject(void_list)
            printf("%d voids in the TOP layer\n" length(void_list))
        )
       
    )
Children
  • khuranav007
    0 in reply to Hoangkhoipcb

    Hmm thanks.  Still only getting voids completely inside the shape only.

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