what causes this?

[Brim]

Hey guys,

Something I'm working on. VRay was worked like a charmed so far giving me quick test renders. Then I came across this:



VRay Adv. 1.09.03g

Using high preset with 50 sub d's and 20 interpolations. This image I used a stored irradiance map from previous image. I only get these weird splotches in the shawdows - not in direct sunlit areas. Any ideas what causes this? My settings are pretty high. The subdivisions on my direct light are at 40.

Xavier

[R2J2]

just guesing but 1: if there are any changes from the precaled irrad map, you'll have to redo it, 2: if it's not that then instanced objects or using the mirror tool can cause these.

Hope that helps_Jay

[Brim]

that was quick...

Yes - I used alot of instanced geometry and I mirror lots as well. What is the work around for this? Do I tell Vray to use instance rather than replicate in the system box?

Xavier

[R2J2]

yeah use replicate, and use the mirror modifier not the mirror tool thats in the maintool bar.

[Brim]

What is the difference b/w the mirror modifier and the mirror tool (in the toolbar)? Would convert to editable mesh get rid of this stuff?

thanks,

xavier

[R2J2]

not shure, thought I would be interested to hear if it does.

[Brim]

reproducable

ok....i redid the irradiance map and eveything come out ok.



But then, using the stored map, I change angle and get this...



I haven't tried collapsing everything to editable mesh b/c I really don't want to (ease of editing later on). Any other ideas?

I'm usnig all Vray materials, with Blinn shaders. Here are my settings:



Thanks.

Xavier

[R2J2]

ok, thats simple. the irradiance map is view dependant. so you need to re-render that frame with add to current map checked to get the GI samples for that view, then render from file shoud be fine.

Love the image BTW

[Brim]

great!! thanks for clearing that up for me.
makes a lot more sense.
BTW - I'll post the project when it is finished (1-2 days)

regards,

Xavier

[R2J2]