LC for RT GPU?

[Micha]

I read the docu and ask me, should it be possible to use LC as primary and secondary engine? I tried it, but it looks horrible. Or is the switch missing to set the LC in progressive path tracing mode (like known from VfR2)?

[kvorning]

Does is make sense, now you can have a progressive render instead of buckets?

[Micha]

LC never showed buckets. I ask me, could using LC-LC bring some advantages like more speed. At the moment LC-BF is working only.

[Micha]

Also at the GPU help page I found:

Using Light Cache (as a secondary GI engine) with V-Ray GPU is possible only when rendering in production mode

Production mode means, GPU and disabled "interactive" or? Here I see the LC run at the CPU, also quite slow, approx. at 30%..50%.

[kvorning]

LC never showed buckets. I ask me, could using LC-LC bring some advantages like more speed. At the moment LC-BF is working only.

Maybe I'm wrong, I thought the "old" way with LC-LC was for having a progressive render AND high quality, but also pretty slow(?), but now we have progressive with BF, we can just crank up the quality there instead? Not a 1:1 solution, but better for speed and quality with LC+BF?

[Micha]

At the moment I have LC+BF (GPU mode). It's faster than if I would set BF+BF. I'm not happy with the BF, the spiral bucket calculation isn't a progressive calculation, quite slow some times and runs in "passes" (one complete spiral needs to be rendered). So, my hope is that LC+LC could work better.

But maybe LC+LC is no solution and the BF needs to be optimized. Could it be that there are some options missing? My current test scene works horrible and I find no solution.