How to color a mesh or a points cloud from a geotif ?

[thomas.touze]

Hy everybody,

I've got a 1km x 1 km scene with a 1m resolution. I have successfully imported a DTM, from a LiDAR survey, and a geotif.
I would like to color the DTM with the geotif, but I can't find how to proceed.

I have tried >> Edit > Colors > Interpolate from another entity
But cc tells me it can't proceed because "clouds are too far from each other".
Indeed, my geotif has a 0 altitude whereas my DTM is around 500 m.

Has anyone an idea to solve this ?

Best regards,
Thomas.

[daniel]

Do you mean that your geotiff is flat?

[thomas.touze]

Good afternoon Daniel,

Yes it is flat.
You can have a look here:


Best regards
Thomas.

[daniel]

Hum, sadly, even if this looks silly, CC can only manage interpolation between 3D entities (as it relies on the nearest neighbor for each point to do it)...

[thomas.touze]

OK, I supposed so.
Thank you for your time.
Best regards
Thomas.

[WargodHernandez]

I wonder (without researching it much), if you could make this work by exporting your coordinates to scalar fields to save the 3d coordinates.

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Edit->Scalar fields->Export coordinate(s) to SF(s)

Then create a constant scalar field with a value of 0.0 and a name of "ZZero"

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Edit->Scalar fields->Add constant SF

Then select "Coord. Z" as the active scalar field in the properties window and rename to something else like "ZOrig"

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Edit->Scalar fields->Rename

Then select "ZZero" as the active scalar field in the properties window and rename to "Coord. Z"
Then we set set our SF as coordinate (This command takes the SF named "Coord. Z" and applies the values in the SF as the new coordinates which should all be zero)

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Edit->Scalar fields->Set SF as coordinate(s)

Then select both the cloud and the tif and interpolate the color from tif to the cloud

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Edit->Colors->Interpolate from another entity

Then delete "Coord. Z" and rename "ZOrig" to "Coord. Z" and finally set SF as coordinate to restore the 3d cloud

[daniel]

Ah! It might work indeed (since the clouds are dense and all)

[pbrgle1]

Thank you WargodHernandez! Works like a charm! :)
I used your technique to colourize the vegetation, which is then used in Twinmotion for diagrammatic (but accurate) architectural visualizations.