Lines in fill when exporting to pdf

[idag33]

x16.

when i export to pdf my fill gets broken up into triangles with a faint white line type. how do  i resolve this? you can see it in the darker gray  

[PitMan71]

Is this a solid fill type?

[VHampton]

Is that a poly-line from a plan view which was made into a CAD detail? 

 

When a poly-line (with solid fill) is converted into a CAD detail, the "fill" can become fragmented. 

Blocking a poly-line prior to creating a CAD view can sometimes prevent this triangle effect.  

 

The screenshot of the PDF print looks exactly like this condition. 

 

Is it possible to:  a.) send the original plan view to layout?

...or: b.) Make a Cad "block" of the roof poly-lines prior to creating a CAD detail of the view.

 

Last observation(s)... 

Is the PDF being made with the built-in Chief printer? ...or is it a different print source, like Adobe for example?

 

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EDIT as per Michael's post: This is not an isolated CA anomaly.

It happens with AutoCAD too. 

 

Lowering the dpi quality of the PDF print may help. Allegedly. 

 

 

Why are There Lines Showing in My Solid Fills?

 

AutoCAD and most CAD programs approximate solid fill areas by drawing anywhere from two to several hundred triangles to approximate the area.  They do this because printer drivers do not recognize filling the complex areas so AutoCAD approximates it based on the triangles that printer drivers will understand.  Much like how solid meshes are used to approximate complex 3D objects.

 

And even though the endpoints of the triangles are written identical in the PDF format the rendering engines of PDF Viewers will typically end up showing dashed lines between some of the triangles when they scale the endpoints to the screen which is much lower resolution than the PDF.  An 8.5x11.0 PDF at 600 DPI would be 5100x6600 pixels which is considerably higher than today's computer screen resolutions.  

 

Below is a sample of standard solid fill output from AutoCAD to most PDF drivers.

 

 

 

Many PDF Viewers also perform antialiasing on the graphics to make them appear smoother on the screen. If you zoom in on a 1 pixel wide line drawn at 45 degrees it essentially will look like a set of stairs.  Antialiasing adds lighter colored pixels around the line to simulate a smoother line to the human eye.

 

Below is a sample of a standard line on the left and an atialiased line on the right.

 

 

The antialiasing is typically what causes the lighter colored lines shown in the solid fill areas from CAD files.

[Michael_Gia]

8 hours ago, idag33 said:

how do  i resolve this?

You can’t. 
 

It’s a PDF issue. 
 

I’ve tried “flattening” exporting in various formats in Illustrator etc and I can’t get rid of them. 
 

This has been posted many times. I’m hopeful one day someone will figure it out and let us know. 
 

[BenPalmer]

I've seen it render differently in different Adobe readers.  I've seen it show in some readers and not others. Perhaps post the PDF file, versus a screenshot, so we can all view it with our different readers to see if we all see the same thing.