How to attach a mipmap to a 2DArrayTexture

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First, I used texassemble to convert the attached 1,2,3 into a 2DArray texture.

texassemble array -y -o number_array.dds 1.png 2.png 3.png

However, this does not add a mipmap, so I tried to add a mipmap on the command line from nvtt_export, but the image is vertically aligned.

nvtt_export -f bc7 -o number_array_mips.dds number_array.dds

If you start the nvtt_export exe, load number_array.dds and save it, 2DArray will create the correct image with mipmaps.
What is the correct option to create it from the command line?
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Hi @kouta.satoh, thank you for the question! In NVTTE 2023.3.2, the solution is to add the --extract-from-atlas --atlas-elements 3 arguments to the command line, like this:

nvtt_export -f bc7 --extract-from-atlas --atlas-elements 3 -o number_array_mips.dds number_array.dds

number_array_mips-2023-3-2-0.dds (256.2 KB)

(I hope to have an improvement here in the future and will update this thread when I do.)

Thanks again!

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It’s done! Thank you very much!

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Hi @kouta.satoh!

I’m happy to say that the improvement I mentioned in my last comment has made it into NVTT Exporter 2024.1.0. Now, the command line to generate mips for an input DDS texture and output a DDS texture is much simpler – no need for the extra atlas options!

This should work now:

nvtt_export.exe -f bc7 -o number_array_mips.dds number_array.dds

Hope this helps, and thanks again for the issue report!

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