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AutoCAD 2021: How the hatch is drawn despite there is gap while the gab tolerance is set to be 0?

JamaL9722060
Collaborator

AutoCAD 2021: How the hatch is drawn despite there is gap while the gab tolerance is set to be 0?

JamaL9722060
Collaborator
Collaborator

AutoCAD 2021: How the hatch is drawn despite there is gap while the gab tolerance is set to be 0?

 

In the screenshot below, I wanted to draw a hatch and found out that it’s drawn successfully despite the fact that there is a gab (indicated) while the gab tolerance is set to be 0

 

The dwg file is attached

 

Clip_1048.jpgClip_1049.jpgClip_1050.jpg

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Jamal Numan
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6 Respuestas
Respuestas (6)

cadffm
Consultant
Consultant

Hi,

 

crazy, right?

 

Autocad calculates not with the real object data, it calculates with the data in the "display list"

and this is the data for the current view - so it is view dependend!

 

Look at my sample, recreate this sample and play with ZOOM.

Zoom In = Won't work

Zoom Out = Will work

 

(note: Preview and real Hatch-creation are not calculate by the same internal function, often preview works, but adding a hatch failed.)

 

HPGAP1.JPG

Sebastian

JamaL9722060
Collaborator
Collaborator

The issue is transferred to FME!

 

I wanted to subtract the 7 polygons (that represents the landuse) below from the entire hatch (that represent the entire area) in order to get the roads

 

The clip commands endsup with 10 polygons instead of 7! Not sure why!

 

Then, how to control the behavior of AutoCAD to match between what is physically drawn and what’s visually displayed on the screen?Clip_1059.jpg

 

 

Clip_1056.jpgClip_1057.jpgClip_1058.jpg

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Jamal Numan
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dany_rochefort
Collaborator
Collaborator

In this case, i believe the problem is the way your lines are drawn rather than Hatch command tolerances.

 

Each individual area should be a closed polyline rather than a bunch of seperated lines. 

 

 

Try using the Boundary command with Pickpoint option to create 7 closed polylines.  Everything should work fine...

 

Have a look, cheers

 

01.png

 

JamaL9722060
Collaborator
Collaborator

Thank you Dany for the input.

 

But what’s weird is that AutoCAD can still draw the hatch knowing that there is a gap and without configuring any gap tolerance as in the above drawing

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Jamal Numan
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cadffm
Consultant
Consultant

The easy answer is still:

The help text is wrong.

 

Sebastian

Alfred.NESWADBA
Consultant
Consultant

Hi,

 

>> But what’s weird is that AutoCAD can still draw

>> the hatch knowing that there is a gap

Source of the issue is not that AutoCAD tries to find solutions even if there exist drawing errors ... the real error is that the lines are geometrically not building a real closed polygon.  Therefor my way would be to search where the geometry error happened, this is where to start the correction :cara_guiñando_un_ojo:

 

- alfred -

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Alfred NESWADBA
ISH-Solutions GmbH / Ingenieur Studio HOLLAUS
www.ish-solutions.at ... blog.ish-solutions.at ... LinkedIn ... CDay 2025
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(not an Autodesk consultant)