White splotches with vray rendering???

[dominicknack]

Hello... Im a vray noob, but im willing to learn... I am tyring to render the church of light by Tadao Ando, i use irradiance map and light cache, but then i got these white splotches upon rendering. I have tried with many different values of the irradiance map settings, but to no avail... could this be related to vray sun parameters? can someone guide me?

 

 

 

[ATTACH=CONFIG]43430[/ATTACH][ATTACH=CONFIG]43431[/ATTACH]

[Nic H]

1000 hsph subdivs?

 

think you need to learn the basics before asking this quiestion

have a look around the previous threads and i rekcon you will find your answer!

[dominicknack]

because i have tried every value... and it still appears. of course i have searched around for tutorials, values of 50 and above is considered high i know. But i just wanna post this image to illustrate my problem

[archigem]

what's the use of caustics?? why u r using it?

[Scott Schroeder]

Looks like a whole mess of things are causing this. There could also be a material that's incompatible with Vray that's causing this.

 

What kind of render errors are you getting from Vray?

[avvid]

I think it's the GI caustics. Try turning them off.

 

Besides, I think you should be using EITHER GI caustics, or V-Ray caustics; not both. But try to avoid GI caustics anyway, as they can be a pain.

 

I try to never use a value higher than 50 for the irradiance map hemisphere subdivisions, and my renderings look clean. You can also usually get away with 500 or less, for the light cache subdivisions.

 

A good way to troubleshoot these things, is to turn features off, one at a time, until the problem stops. You can then start to narrow it down. So you could start by turning off GI. If that does it, then turn it back on, and turn off the irradiance map. If that fixes it, then you know it's the irradiance map, and you keep going from there. But try what I suggested, first.