objects in reflection are bleaching out...

[biglolly]

Hi All, I'm having a bit of trouble with reflected objects bleaching out in an animation I'm working on. This is probably a really simple problem to resolve, but any input would as usual be appreciated! Here's an example of the problem.



In fact, the reflection of the ceiling isn't even just bleached, it's not actually reflecting the same metalic area at all as I can't see my bump.

Another problem I've had again with this roof material is I'm ending up with this...





Any ideas?

[vlado]

What are the settings of your glass material?

Best regards,
Vlado

[biglolly]

Hi Vlado,

Here are the settings of the glass.

[vlado]

Well, first of all if you are still using V-Ray 1.47 make sure you have the "Override material IOR" option ON in the Falloff map (and any Falloff maps in general).

Also, does your glass actually have any thickness to it, or is it just a single plane? If it is a single plane, try adding thickness to it.

Best regards,
Vlado

[jonnybefree]

if i'am not terrible wrong, turn on override material ior in your relflection falloff map.

[biglolly]

Cool one, I'm trying that now. Still getting the spots on my polished aluminium material, here's the settings.

[vlado]

Do they do away if you switch from Ward to something else (e.g. Blinn)? Also, are you getting any warnings in the V-Ray messages window?

Best regards,
Vlado

[jonnybefree]

i don't know why, and there's certainly a solution for this, but i'am also getting often splotchies like that when i'am using ward materials. try switch to phong, and increase glossiness maybe.

ups isochronal

[biglolly]

hmm changing the glass falloff IOR override to on didn't work, it's as before. I'm using 1.5 RC2 with the software dongle.

I'm trying a non-ward solution for the aluminium now.

[biglolly]

Changing from ward seems to have fixed the splotches - however it seems to render a lot slower now for some reason! That's tolerable, but If it could be faster it'd be good.

The reflection problem is still giving me trouble though. My glass has thickness vlado. Any other ideas?



The blotches are gone! This wee strip took 56 minutes to render on a dual 3.0ghz xeon though...my settings must be too high?

[vlado]

Well, beyond that you can try to send me (a part of) your scene to vlado@chaosgroup.com so that I can take a look at what may be slowing it down.

Best regards,
Vlado

[biglolly]

I think I might know why I'm seeing a bleached out reflection in the glass - it's somehow reflecting my supposedly invisible vray light!

Perhaps I also have to select the light and adjust it's default max properties to make it not renderable? I haven't tried this yet but hopefully it works...

[DanielBrew]

Perhaps I also have to select the light and adjust it's default max properties to make it not renderable? I haven't tried this yet but hopefully it works...

No need to do that, in 1.5 you have to uncheck 'Affect specular' to make VRay lights invisible to reflections.

Dan