Path tracing 12M-spp vs Photon tracing 6k-spp

[nuno1980]

Hello, guys!

I tested a GeForce RTX 4090 with GRD 546.33WHQL driver on Windows 10 22H2. After 12M-spp at path tracing, this GPU got no any GPU fails.

--- Ice stone on glossy indoor with the roughness of 0.06 at our sun scene ---

-> Full-image at Photon Tracing kernel with 500 spp during alnost 2-min at GI clamp 1.0, at radius-0.09 and at 49-photon depth but no any variable caustics*(1):

-> 1st blue region picked at Path Tracing with 1M-spp during alnost 5h13min at full GI clamp, at 33-diffuse+49-specular depthes and no "caustics blur":

- 5 cycles of number of spp from 1M to 12M (or 12 laps*(2) of 1M-spp):

---> the difference of 2 small images between Photon Tracing with 6k-spp and Path Tracing w/ 12M-spp:

At 1920x1080 for all images rendered without denoiser.

I confirm no any issues at more than 2M-spp at path tracing!

*(1) - Learn - HERE
*(2) - How to increase to more than 1M spp for region picked only -> HERE

[nuno1980]

I tested 7680x4320 for caustics at path tracing...

12M-spp@1920x1080 is as better caustics' quality as approximately 1.5M-spp@4320p.

New screenshot - this region picked on a RTX 4090:

4320p test - 2Mspp during ~1h.png (163.8 KiB) Viewed 1279 times

<3