Very excited at the work being done here… I am working on some R&D for a large scale GSplats (think city scale) so have been very excited by the advancements in LOD streaming capability of PlayCanvas.
In my testing I have done the following:
Train LOD0 at highest quality in PostShot
Copy PSHT project and retrain at lower quality (LOD1-4)
Use splat-transform to pack everything into lod-meta.json format
This is generally working quite well and was able to get an example working, however the quality loss is currently a bit of a show stopper for me.
I tried SOG which was quite a bit worse, so sticking with the JSON/Folder format for now.
My LOD0 PLY is acceptable quality, but when I transform it into streaming format, there is degradation of hard edges and also some color shifts (might have been due to the spherical dims flag)
My question is what levers do I have access to with the splat-transform CLI and what will get me the absolute best (as close to lossless) quality as possible?
I just tried to re-package with --lod-chunk-count 1024 but this seems worse, as I ended up with 11mb 2k WebPs
Any tips on LOD creation or splat-transform workflows are appreciated!
I am rendering in custom code just like the LOD streaming example:
// Create gsplat entity first so we can reference it in callbacks
const entity = new pc.Entity( "splat");
entity.addComponent("gsplat", {
asset: assets.splat,
unified: true,
});
Is there a way to view a meta packaged LOD splat in supersplat or in some other editor to confirm it’s not my code?
but from the screenshot it seems it uses lower LOD there perhaps.
enable colorization - see how that example does it. If using level 0 (best quality) it would colorize it to red.
This is using LOD0. I have a dropdown to force it and also colorized it shows up red… This is using my code though… I will try to make my assets public so I can test in the example you provided.
It does indeed look like a lower LOD so it is possible my code is just wrong
I tried with a different pack I had done and did get some slightly better results… This is out of the example link you posted above.
My eyes are not super well trained for splats yet, it may match the quality of the PLY pretty well, but the colors seem off…
I believe I did have the spherical bands flag set on this one… Can you share what would provide the most accurate output? No flags, just each LOD? Maybe best if I start there…
And on that note, is my approach of copying postshot files and retraining with lower settings a fair approach for creating these LODs or is there a better way?
