I also investigated this issue to exhaustion today, I would like to second it as important.
After all the work done to make new and improved display modes, it seems a waste that the native PDF printer cuts some corners when rendering and saving the results. The new display modes are very refined, helpful, and good looking, it’d just be nice to have it on paper too.
It seems like the line, edge, surface, and shadow effects of a detail are rendered at a fixed resolution separate from the DPI of the print, size of the paper, and the zoom factor in layout space. Adjusting the scale factor in the print preview window provides a higher resolution render, but is then cropped by the edge of the paper. The exported PDFs then all have lower resolution graphics and muddy “linework.”
I would speculate that the rendering is taking place at the same resolution found in the print preview window, but since this is fixed to the size of the desktop window, it’s usually low resolution and quality.
In the image, the bottom preview shows render results that totally look great, but since it doesn’t layout on the paper like the top preview, it’s useless.
In trying to troubleshoot this issue, I found some other quirks that really hinder workflow, but aren’t quite so game breaking that they can’t be worked around. First, it doesn’t seem like PrintDisplay Mode can be activated in a layout detail (adjusting lineweights and styles after enabling a detail isn’t so convenient.) Second, the math for adjusting the DPI for dots/cm seems to be backwards. Typing in 100dots/cm compresses the render at about 39dots/cm, which kinda make sense if it was 100 dpi translated to dots/cm. Third, when exporting Rendered Display modes, sometimes these triangle artifacts mess up the image, as in the second attached PDF. (Maybe just an issue with my graphics driver and OpenGL?) Last and least, occasionally, hitting the Printing All Layouts bubble on the print screen will not print all the pages unless they’ve been viewed in layout space first. Like they need to be manually cached or something. (maybe this is just a problem with heavier layouts and display modes)
Again, Thanks for all the help and attention! I get these are relatively mundane compared to all the other features Rhino excels at.
181122 Elevations Schnellerstrasse300.pdf
181122 Elevations Schnellerstrasserender.pdf