Orthographic Projections with White background colour, is this possible? It needs be.

General Tutorial & Course Discussions
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1

I knew before I sent this out, compiled in an Autocad drawing. “Can we have a white background?” Obviously, they are going to plot it on white paper.

There seems to be a background colour setting for a screen render, but not for an orthographic projection. Or am I missing it?

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Thanks in advance.

2

This is not possible to set, but you can try to export different format, as for example TIFF is without background and JPG has black background:
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3

Thanks, tried PNG, TIFF, JPEG, JPG, TIF and they are all black.

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4

Is it the same also outside of the CAD?
Can you try this: Help?

5

The exported images have a black background whichever software I opened them in. The Autocad fix did work, though it does leave a scruffy edge.

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I could re-touch this edge. Hmmm maybe not in Autocad. My architect has got past this using Photoshop maybe I’ll have to do the same.

Thanks for your help.

6

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7

Have you tried also QGIS? For me it was different, TIFF was without black background.

8

I can’t see an option for QGIS export. It’s all about the end user. The architect with a low spec workstation. 5MB JPG’s with white background so S/he can plot on white paper.

This is also odd behaviour.

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I can spin it around in CAD, but I will have lost my Z to Y coordinate. The whole export with image coordinates is tricky. We need to know the Z value in the bottom left-hand corner. I have had to work around this uncertainty by using a reconstruction region to ground control points for which I know the Z value therefore the base level of the box.

9

There is no such option, you just import the exported ortho to QGIS.

You need to use this corner (the selected corner is basically upper left corner of the ortho)
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Regarding to the heights of the ortho check these: About laser scan reference - #48 by Anonymous_b53149a1f1, better way to export orthophoto to cad software - #10 by Anonymous_9a96793ccc, Orthophotos - Mauvais Z, tête en bas, différentes altitudes pour une même bôite... - #2 by OndrejTrhan

If you are exporting the georeferenced ortho, the Z values are there, you just need to use one plugin for AutoCAD (it is mentioned in the attached comments). Then you will be able to measure the height of the bottom left-hand corner.