Problem in converting to shape file from Autocad file

[gsfeng]

Hi,

I am trying to expose the hatch information for the polygon shape file from the Autocad file, but what I got from the shape file is that there are some hatch objects created which do not appear in the Autocad file. Do you have any idea what might be the problem? :confused:

Thanks!

[GuthCAD Software Support]

Hi,

Are you able to email us the drawing so that we can investigate?

Sometimes small Hatch areas may become invisible in AutoCAD if their definitions are such that no parts of the hatch pattern intersect the defined boundary. Such Hatch entities cannot be seen, selected, or even purged, even though they remain defined within the drawing. It may be the cause of the problem, but there are also other possibilities.

thanks
software support

[gsfeng]

Hi, since the data is confidential, I will need to check with my superior first. Which email address should I send it to?

[GuthCAD Software Support]

Hi,

Please be assured that we will treat any data that is sent to us with strict confidence. However, you may be able to delete confidential portions of the drawing, and just send a part of the drawing that still demonstrates the problem.

For the email address to send to, click on the 'GuthCAD Software Support' name at the top of this reply, and from the drop down menu select 'Send email to GuthCAD Software Support'.

best regards
software support

[gsfeng]

Hi, I have sent you the file with my registered email.

[GuthCAD Software Support]

Hi

Thanks for send the drawing. We have checked it out.

It seems that some hatch entities become invisible in AutoCAD when the hatch pattern type is specified as 'SOLID'.

We have sent you back an email with the drawing 'islandhatch2.dxf' attached, where we have edited the DXF file to change the pattern from SOLID to ANSI31, which causes the invisible hatch to become visible.

For you own experiment please change the HATCH pattern properties of the HATCH in the top right corner of the drawing from 'ANSI31' to 'SOLID'. It will disappear!

I think that the problem partly stems from the fact that AutoCAD allows the user to define boundary definitions in a non strict way, which may lead to ambiguities for complicated definitions.

We will keep working on our algorithm for interpreting HATCH boundary definitions to better match that of AutoCAD.

At the moment the only work-around is to physically delete unwanted hatch entities, or where possible to re-define them using a 'simple' method. For example in the case where there are multiple islands, define each island as a separate HATCH entity, rather than try to define multiple islands as a single HATCH entity which may cause interpretation problems (i.e. even by AutoCAD itself - as demonstrated by your drawing.)

thanks
software support