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MSFS24 UV Problem?

rhumbaflappy

rhumbaflappy

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Hi Arno. While working with MSFS2024 BGL libraries and their textures (.KTX2) I have found a problem. When MCX loads the textures and models it appears the UVs and the images are vertically flipped. When they are exported, compiled and displayed in the sim, their orientation looks OK, but truely they are both flipped. In the attached example, the texture is displayed correctly in the MCX window, but the texture display is vertically flipped, and remains that way when exported. Because it displays OK in the sim, that tells me the UV has also been flipped. if I substitute the original .kxt2, the display is vertically flipped, meaning the UV has been flipped.
UV_Problem.png
 

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Thanks Dick. I'll have a look.

So you are saying the arrow should point down?
 
No, the arrow should point up. In the sim, it does point up, but the texture from MCX is vertically flipped... so that means the UVs were also flipped. KTX2 to PNG shouldn't be flipped, nor should the UVs to correct that.
 
Right, let me check. I know in the past I had to do some flipping as the source and compiled files differ (I even believe the package tool does some flipping).
 
Hi Dick,

I have started to look at this issue now. When I open the KTX texture in the MCX texture viewer the arrow is pointing down. I guess that might be the problem, but I am struggling a bit to find another view that can show KTX textures to double check that I made a mistake with reading the texture. Do you have a suggestion for a tool that can read the KTX file?
 
I was looking for a KTX viewer that could be used independently from MCX; this search yielded quite a few hits: :idea:

https://www.google.com/search?q=KTX...D8IHCDAuMy4xNi4xyAdPgAgA&sclient=gws-wiz-serp


I plan to test Castle Image Viewer:

https://castle-engine.io/castle-image-viewer


...as it can create a thumbnail gallery somewhat like "Browse" in XnViewMP (which views most DDS formats):

"Browse all the images within a single directory (use keys Page Up, Page Down)."


XnViewMP:

https://www.xnview.com/en/xnview-mp/

GaryGB
 
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Yes, but the few online viewers that I tried all failed to show a MSFS generated file :). So did you find one that works?
 
Thanks, using the NVidia tool the arrow is indeed pointing up in the texture, while MCX show it pointing down. So it seems I need to update my KTX2 reader to flip it and then I do not have to touch the texture coordinates of the model anymore.
 
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