Scenes are too dark

[rafcon-dev]

trafficstars

hi guys. For some reason I'm getting really dark scenes. For example, for this file: https://downloadfree3d.com/3d-models/vehicles/ship/south-korean-destroyer-chung-mu/ This is what I get in the viewer:

and this is what I get in an online glTF viewer for example:

Similar thing happens with stl files for example, the image is just too dark and flat. Am I missing something? I'm just running a simple commad with no options. I've tried --dry-run and a few more, nothing. Tried --geometry-only, and it renders without textures, but still too dark.

• OS: Ubuntu 22.04.1 LTS
• GPU and GPU driver: GTX 770 450.203.03
• f3d --version`: 1.2.1

[Meakk]

It's a gltf file? You'll get best results using a HDRI file. You can also try to change the background color.

[rafcon-dev]

It's a .glb file.

Chaning background color doesn't seem to affect the lighting. Adding a light grey hdr image indeed improved the lighting. Still, it's a bit too flat, a bit of directional lighting wouldn't hurt. The thing is, for .obj files it becomes too washed out, so I have to use a different command for those than from glb/gltf. I'm trying to generate previews for lf file manager. I suppose this also happens with the thumbnails generated with f3d? Still, for stls, the thumbnails are a bit flat, when compared with stl-thumbnailer, for example: f3d result:

stl-thumbnailer:

I had to use a white hdr background as I didn't want the hdr showing in the background. I assume there isn't a way to use hdr for lighting, but have a different background color (like Blender can do)?

So, 4 things:

• Probably glft and glb files could have a default light grey hdr applied for the thumbnailer
• Lighting in the default scene could be improved, a bit brighter and more directional
• default stl files orientation does not appear to be correct?
• add a way to use hdr lighting, while keeping a solid background color

[Meakk]

• I don't want to add a special feature for a specific format, the default light setup should be used for all formats.
• There is no way to customize the punctual lights setup right now. This is something we'd like to add in the future though. In the short term, we could add a "light-intensity" option to increase the brightness of the default lights.
• The orientation of the scene can be set using the --up option.
• An option to hide the hdri in the background can be useful indeed. At least, the --no-background option should work with the --hdri option if it doesn't already.

[mwestphal]

This is fixed by #461 , set the light-intensity in your config files @rafcon-dev

[mwestphal]

This will be further improved with #944, where a default HDRI will be provided