heightfield output UV maping

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I'm trying to generate a heightfield output of a sheft tool like dunes for example.

At the default parameters of size 1000 x 1000 and remaped 0 to 1 everything looks good. When I export to a square res file it all looks correct.

The problem is if I change the size to say 2000x2000 or 4000x4000 when I then go to export it's only generating information on part of the image like the UVs are wrong and is just part of the image instead of square map of information.

Not sure how to fix this, any ideas? Thanks
Edited by superkfx - May 22, 2020 19:40:02
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See example. Correct on left, unexpected behavior on right.
Edited by superkfx - May 22, 2020 19:40:23

Attachments:
hf_test.jpg (122.0 KB)

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Ok well i figured something out. Seems like it's weird when i make the grid spacing 0.5 instead of 1 for example.

Still would like to increase the resolution by decreasing the grid spacing.
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