did you search this forum and check for example the export options ?
you should figure out, wether it is an export problem or an import problem.
Did you have any .dxf from the target Application that allows black ?
if you want to make sure you need to look at the generated .dxf ( recommend a simple one, with one single line) - it is a readable text-file
and the specifications can be found online:
→ check if Rhino writes a proper black
→ if yes it is an import problem and you have to see the Target Application ressources.
→ if no it is an export / Rhino-Problem and you can report a bug here.
And to have others to profit from your problem: please post the results here - including the name of your “target-application” … something like "export dxf from Rhino - import in “my target application” …
I think it is not the same. I did some tests with Rhino only. When Color by AutoCAD index is selected, Rhino exports both white and black as ACI 7 regardless of the viewport background color. @lowell, can you confirm? Thanks.
This is almost for sure because of the treatment of color 7 in Acad.
I can’t follow this discussion very well so I’ll back up a little.
In Acad, Color 7 is displayed as black when the viewport background is light and as white when the background is dark. Rhino has no such feature.
If you write Acad files with the Rhino DWG/DXF writer using color by AcadColorIndex, both black, color RGB(0,0,0) and white, RGB(255,255,255) in Rhino will be written as ACI 7. That will display as either black or white in Acad, depending on your background color.
If you want to export to Acad files and really control the black/white color, you can use RGB color definitions.