HLR Printing - missing lines

I just recently discovered how to print vector images using the 'high accuracy HLR.' I've had pretty good results, but in seemingly every image, whether I'm printing to a pdf, or to an actual printer, I have a few lines missing. Any thoughts on why, or how to correct it?

It happens quite often - even more frequently with 2D DWG exports, most often with lines that are on a large surface. I understand that it is a question of rounding errors in the perspective image calculations. A surface has a zero thickness, and a line has zero thickness and width, so to determine whether a line is visible or not, SU has to make a decision and cannot calculate indefinitely.

I remember similar problems with hidden-line images of surface models from other applications like AutoCad too, and I am afraid the maths are such that there will always be errors.

Anssi

I solved this by not using any of SketchUp's export options. Instead, use an image capture program such as Snag-it (there are still some free version 7's available) and capture the image you want, saving it as a png. Then use another freeware program called Wintopo (from softsoft) and do a 1 step conversion and save as a dxf. When I bring this into Acad all the lines are there.

This works for SU 7 free version also.

Have fun.

MG,

Nice idea but all accuracy will be lost. Usually the few missing lines are easily corrected.

Another method would be to export the whole 3D model into ACAD, and do the 2D views as paperspace viewports, or then do the flattening, if necessary, with AutoCad's own tools. AutoCad Architecture has even more options for converting 3D to 2D than "plain" AutoCad.

Anssi

Hi Anssi,

How will accuracy be lost?

Well, with a screen capture app. you cannot make higher resolution images accurately than your screen resolution. What if there are finer details within the accuracy of your drawing?

Gai...