Unlit material render wrong color

[BCDavid]

Hello ! Unlit material don't seem to render properly using model viewer.
I tried :

environment-image="neutral"
exposure="1"
shadow-intensity="0" 
shadow-softness="0"

Model render on my website with modelviewer: https://www.didierbecet.art/

Model render on : https://github.khronos.org/glTF-Sample-Viewer-Release/

Thank you

[shamsail]

Try to change environment attribute with hdr file

environment-image="../path/to/src/file.hdr"

[BCDavid]

Thanks for the reply,
I tried with an hdr file, with no change apparently still getting darker color.
Isn't unlit rendering should not be affected by environment image, exposure... ?

[shamsail]

you can use exposure from range 0-2
try to change exposure="2"

[BCDavid]

I made 2 glb model, one with KHR_materials_unlit and the other without, model viewer doesn't seem to use the extension
Is there a way to enable the extension ?

Here are the exposure tests :

Model render on : https://github.khronos.org/glTF-Sample-Viewer-Release/

Model render with modelviewer Exposure 1

Model render with modelviewer Exposure 2

[shamsail]

Model viewer has included this, i think so..
just remove environment map from your side as well..

elalish@cbeaf6f

exposure="1"
shadow-intensity="0" 
shadow-softness="0"

Just keep this. try it

[BCDavid]

Environment map is removed but no change so far.
Unlit material seem to render fine on all viewers except modelviewer, I can't find if the issue come from my model or not.

Here are my gltf files if it can help :
https://assets.didierbecet.art/GLTF/med_ray_002.gltf
https://assets.didierbecet.art/GLTF/med_ray_002.bin

[BCDavid]

I found a workaround by reducing the texture contrast by -25% / -50%.

[elalish]

This is interesting; it looks like the issue might be tone-mapping being applied to the unlit result? That could be a bug. In the sample renderer I believe they have tone-mapping options; do those have any effect?

[elalish]

Fixed in #3152.