light cache and RAM

V-Ray for 3ds Max V-Ray for 3ds Max :: General
1

Is the light cache pass calculated using RAM or the CPU? I understood it as light cache uses up memory and then the final rendering uses the CPU. Perhaps there is a mixture of both? What about the irradiance map? How is that computed?

Thanks,

2

each calculation uses cpu and ram.
ram cannot calculate itself.
so LC, IR and all are calculation done by the cpus, but calculations most time also takes quite some ram do be able to calculate the needed data (the feed the cpu fast). so if you have not enough ram it might get very slow or not possible to compute.

stefan

3

Ah Cool thanks for the info.

4

The setting that affects RAM usage by the light cache is the “Sample size” parameter. Lower values cause more samples to be generated, as each sample is smaller. Larger samples take less RAM.

Best regards,
Vlado

5

Thanks for the explanation