froyok

froyok, 1 day ago

@GabeMoralesVR Hmm, this will be a last resort option to me because if I can pay the authors I wouldn't mind.

froyok, 4 days ago

Working on my cubemap generation pipeline I was still puzzled on why the IBL would be so strong compared to the actual lights.

I decided to verify that my PBR wasn't broken by using red PBR balls this time and well...

froyok, 4 days ago

Took me a day to figure out what was happening.
After checking my code a few times I isolated it out on being related to the DFG LUT.

Inverting its value (one minus) was somehow fixing the shading and brightness issue. This was very confusing.

Then I extracted the LUT from Filament and compared it from Learn OpenGL and mine.

Here is what they look like in Designer:

froyok, 4 days ago

Notice what's wrong ?

Filament LUT use swapped Red and Green channels in its LUT.
My initial one minus trick was just a lucky fix. I'm glad I took the time to figure out what was happening.

In their doc, Filament doesn't mention that swap: https://google.github.io/filament/Filament.md.html#table_texturedfg

Anyway, once I figured this out, the fix was immediate and my shiny balls were now looking great:

froyok, 4 days ago

So once that was working, I quickly hacked in parallax correction for the cubemap and overriden Sponza floor to be mirror-like.

It now looks really great ! Time to clean up the code and expose everything on the editor side. :D

#gamedev #opengl #cubemap

A looping gif of a camera panning inside Intel's Sponza scene. The floor reflects the pillar and a neon light.

froyok, 4 days ago

@frguthmann That's the issue with scary math like that, I'm too afraid to read it properly. :p

froyok, 4 days ago

@nick It's pretty fresh and requires specific hardware I believe, it just got introduced in DX12 so I don't know about OpenGL and also my framework would need to support it too which isn't the case yet.
Anyway, BC6h is the ideal target here. :)

froyok, 2 days ago

I'm looking at ways to store my shadow volumes resulting binary mask in the form of a bit mask.

The goal is storing something like 32 shadows into an RGBA8 texture to sample it later when rendering object.

Doing so will allow me to render the lit object only once (while doing IBL + casting lights + other lights).

froyok, 2 days ago

But today I played again with the idea of mesh based light shafts.
I asked a colleague for help and it got me some convincing results !
This is basic depth evaluation, no analytical formula yet.

#gamedev #opengl #shadows