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ksorsby
Posts: 218
Registered: ‎07-07-2006
Message 1 of 12 (261 Views)
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Bas relief styles?

261 Views, 11 Replies
08-05-2013 07:11 AM

Afternoon,

 

Best way (if any) of creating bas relief images in Civil 3D? 

We tend to use QGIS for this sort of thing normally but I'd rather be able to create a grey bas relief-style surface in Civil 3D so I can overlay it with other data, labels etc. The data sets we use are quite large, LiDAR down to 50cm grids over a few kilometres.

 

Preferably quick ie. stay clear of setting up light sources etc. . I can kind of get something similar in object viewer with the (50) shades-of-grey setting but it isn't particularly good for straight overhead views.

 

Am on 2013 SP2, Win 7.

 

Ta,

 

Kevin

Mentor
john.mckenzie
Posts: 222
Registered: ‎12-19-2006
Message 2 of 12 (255 Views)

Re: Bas relief styles?

08-05-2013 07:30 AM in reply to: ksorsby

can you provide a small screen shot of what you are trying to accomplish?

 

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john.mckenzie
Posts: 222
Registered: ‎12-19-2006
Message 3 of 12 (247 Views)

Re: Bas relief styles?

08-05-2013 07:47 AM in reply to: john.mckenzie

 

Are you trying to improve contrast between images and CAD linework?

 

We often use an orthographic image as a basemap.

 

usually we do this on coversheets or to supplement limited field survey. there are various instances where this is helpful.

 

In order to use these images with decent clarity of other linework, we utilise the image adjustment tools.

 

Pick the image and right click.

 

Jp2 images allow Brightness, contrast, and fade adustments.

 

We usually stick to the colr orthos but I would think this is possible with grescale ones as well.

 

I know that different image formats allow different adjustments so your resluts may vary.

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john.mckenzie
Posts: 222
Registered: ‎12-19-2006
Message 4 of 12 (245 Views)

Re: Bas relief styles?

08-05-2013 07:53 AM in reply to: john.mckenzie

capture is the orig.

capture fade is the modified one.

Distinguished Contributor
ksorsby
Posts: 218
Registered: ‎07-07-2006
Message 5 of 12 (243 Views)

Re: Bas relief styles?

08-05-2013 07:54 AM in reply to: john.mckenzie

Here's a non-particularly good example of bas relief on lidar data. I'll try and dig out a better one.

 

Kevin

 

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john.mckenzie
Posts: 222
Registered: ‎12-19-2006
Message 6 of 12 (234 Views)

Re: Bas relief styles?

08-05-2013 07:58 AM in reply to: ksorsby

That's ok I have the idea now.

Distinguished Contributor
ksorsby
Posts: 218
Registered: ‎07-07-2006
Message 7 of 12 (229 Views)

Re: Bas relief styles?

08-05-2013 08:07 AM in reply to: john.mckenzie

We'll often have this in the background, with aerial imagery plus a variety of contours, elevation maps and cad linework on top. It's really good for seeing the overall topography and directions of slopes.

 

The annoying thing for me is that I have to create the bas relief in a separate package then bring the image back in to Civil 3D, even though it's exactly the same data.

 

Any thoughts?

 

Kevin

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john.mckenzie
Posts: 222
Registered: ‎12-19-2006
Message 8 of 12 (219 Views)

Re: Bas relief styles?

08-05-2013 08:42 AM in reply to: ksorsby

So you can use the shades of grey if you want to. (view style I mean)

 

Go to your surface style and set your slope analysis to mesh and exagerate the vertical scale to acheive whatever degree of contrast you  need for the bas-relief. you can use the shades of grey or conceptual or realistic view styles. Each with varying degrees of processing ooompfh required.

 

this will have some significant overhead relative to graphics processing but I imagine what you do now does also.

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john.mckenzie
Posts: 222
Registered: ‎12-19-2006
Message 9 of 12 (216 Views)

Re: Bas relief styles?

08-05-2013 08:51 AM in reply to: john.mckenzie

Remember that this is not an image any longer but a dynamic surface representation. You may need a supercomputer to use this method in production unless you can turn it on only when you absolutely need it. I will post a visual snip of what you can achieve in a moment.

Distinguished Contributor
ksorsby
Posts: 218
Registered: ‎07-07-2006
Message 10 of 12 (213 Views)

Re: Bas relief styles?

08-05-2013 09:11 AM in reply to: john.mckenzie

This seems to work and I'll play about with it - but I think you're right in terms of performance. Generating it by QGIS takes 30 seconds and the exported image is georeferenced and much easier to deal with in CAD than a fully dynamic surface.

Setting the working viewport style to shades of grey with a vertical exaggeration of 5 produces a really nice and detailed relief but takes about 10 seconds to pan/zoom 1 step and there appear to be issues with ordering, drawing on top, raster transparencies etc.

See attached for a cad version.

 

Nice idea though!

 

Kevin

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