in Civil 3D 2012, the fading isn't working on arcs or circles for both layer lock fade and xref fade. This is only happening on my machine because I opened the file on two other machines in the office and the fade worked as expected. Is there some setting that would be causing this to happen? Is it something to do with my video card?
We just recently upgraded from C3D 2009 to 2012 and the layer lock fade works as expected in 2009. See attached picture.
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I am aware of these 3 system varaibales. You already mentioned two but I would suggest you try the XFADECTL too. Here they are (copied from help):
I drew some arcs and circles in the drawing with the xref in it and did the in-place xref editor. It seems to fade all the non-xrefed objects as it should. It also works as expected for the in-place block editor.
One thing I recently discovered was that if a assign a non-zero width to a polyline, the arcs will be faded in both the xref and layer lock scenarios. Very peculiar.
You should get a free ride to A.U.
WHIPARC was a nice idea. But you could never plot arcs or circles the right color, unless the color of the arc was the color you wanted to print. So on B&W prints you'd have color arcs! It's been broken since it was introduced about 10 years ago. It's a relative of WHIPTHREAD.