"Dots" during Irradiance Map render...normal?

[Gorlak_cg]

Hi guys,

Been doing some renders and I'm really enjoying Vray at the mo. While using my favoured GI settings of Primary=Irradiance Map and Secondary=Light Cache, I noticed something a bit odd.

During the Irradiance Map phase of rendering, you get the odd "spots" in the image. These don't appear in the final image, but my colleague who uses the 3DSMax version says they aren't in his version and are not a good thing. Is it just par for the course?

I've found that adjusting the Min/Max rates (usually at -3, 0) and HSph. Subdivs effects the size and frequency of the spots and can cause them to carry through to the fianl image (creating blotchy final images).

Anyone experiance the same or have any explanation? Was just curious!

Cheers
G

[joe_b]

Re: "Dots" during Irradiance Map render...normal?

Those dots are irradiance map samples. It is just a visual representation of the samples that are created during the prepasses. I'm not sure why your colleague thinks they are a bad thing.

The bad thing would be if you get blotchy final images - that just means that too few samples were generated or they were not fine enough.

[dalomar_cg]

Re: "Dots" during Irradiance Map render...normal?

The reason why you're colleague doesn't see them is because VfMax has the Show Calc Phase for irradiance map disabled by default (in vfsu we have it on so it doesn't seam like your computer is doing nothing).

I've found that adjusting the Min/Max rates (usually at -3, 0) and HSph. Subdivs effects the size and frequency of the spots and can cause them to carry through to the fianl image (creating blotchy final images).

Good observation...Keeping an eye out on those samples will help you see which areas are in need of more or less. Some times more detailed settings (like a -2 or -3 min rate) can have too many samples on something like a plain white wall and cause some splotchiness (this can be smoothed out with more hsubds, but you could also just lower the min rate).