Working on a lightmapper directly inside three.js, will be most useful for static scenes like archviz. Still need to improve the blotching in the darker areas, will release it once it's done ✌️

You could try some old-school radiosity methods or finite-element method which are not noisy. Radiance Cascades is the latest there and will improve over SVGF for responsiveness. Only issue is that you can't directly observe UV-space probes for specular.

Hey @marco_fugaro I just tried to contribute a LightMapper to ThreeJS, it is here. Could you see how it compares to what you have? If you share your code I could try to combine the efforts to make this PR better?

hey, that's great to have! I didn't see that. I guess the difference is that you are using an existing three.js indirect diffuse algorithm, and just doing the baking part. In my example instead I am building a BVH, shooting some rays and using the lightmap itself as a radiance cache. Then I have some À-trous denoise + upsample passes to smooth it all out. I'll share it open source once I am done so you can improve the three.js implementation, for example I had to remove dilation to get rid of the seams.

would love to try this in the arch viz app we are using in our practice one day

a lightmapper inside three.js would be super handy

I just found out there is already a PR for it, but it uses a different indirect lighting algorithm than mine

Cool!

😊

this looks super promising for archviz stuff. how heavy is the bake time for a mid-size scene?

will try that next!

nice work man. How is the performance on older computers?

60fps on an old Mac M1, there is really no work being done once it's done baking, just reading from a texture

but yes as you can see in the video, in the rebake part there are some expensive parts, but it only takes a couple of seconds

a lightmapper running inside three.js for archviz scenes is a solid idea. is the blotching in the dark areas coming from low sample counts or from the denoise step?

yes low samples, I am trying to keep it fast

Beautiful! Makes such a difference Will you be baking light probes for dynamic objects?

Thanks! That's a possible road for dynamic objects, yes

Thats so cool that the baking happens almost instantly👍👍

yess, will see if I can speed it up more

following this one. looking nice

Nice! I have the non technical, silly version of that in my app.