light cache rendering with 50% cpu usage

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

Hi,

I am wondering why light cache part renders only with 50% of cpu usage. After going to irradiance phase and final render cpu usage goes to 100%. I am just checking is this normal or can I somehow speed up the light cache part. I am using vray 1.5 sp6 and my processor is intel i2500K.

2

Check the number of light cache passes and make sure they are at least equal to the number of logical cores.

Best regards,
Vlado

3

have you checked that that the number of passes correspond to the actual number of cpu threads? also, if you’re rendering displacement of proxies or instances, do you have a high enough dynamic memory limit?

edit: must be typing faster I guess..

4

LC passes are set to 4. I have 4 cores but I have hyperthreading enabled and thus 8 buckets in IR and final stage. I have 24 mb memory onboard and dynamic memory is set to 16 000.

5

setting the passes to 8 should do the trick then..

6

It did the trick and it wasn’t just a cosmetic trick, the scene actually rendered abit faster. Now my IR phase is the slowest part of the render. Is there any parameter that have just a slight effect on quality but big effect on rendertime? My scattered grass is slow on IR phase but the final render stage goes lightning fast. I am rendering night time exterior. I am just loving vray now. I was previously using Brazil rs2.