Problems with condensation and refraction.

[F801]

Hi all,

Does anyone have any suggestions for reducing blown out refractions in condensation (see image attached). They are being caused by the Rect Lights that are lighting the product. The same thing happens using VrayLightMtls. I've tried adjusting the clamp level value in color mapping (set to 1 by default so couldn't go much lower right?). I've tried reducing the intensity of the lights and adjusting camera settings to compensate - the problem persists.

You'll also notice that some of the water droplets are rendering darker than the others. They're not intersecting the bottle and normals are as they should be. Any thoughts on why that might be?

Rect Light sampling has subdivs of 8 and light cut-off theshold set to 0.001
Condensation has a ior of 1.334

Any suggestions would be greatly appreciated.

Thanks,

Paul.

[dgruwier]

For an accurate result, the droplets should be intersecting the bottle just slightly. You want the refraction to transition transition straight from water to glass, instead of water to air to glass.

Also, check the reflection and refraction max depth of your materials, in these kinds of situations, it sometimes needs to be more than the default 5.

All that being said, at a glance the bright values of the droplets don't look super crazy to me, with the bottle material itself being so blurry, spreading the highlight out.

ps: VRay ignores it the light sampling subdivisions unless you have enabled "Use local subdivs" which I really really wouldn't recommend. In any case, that should only affect render noise, not cause issues like this.

[F801]

Thanks for the suggestions. I hadn't thought that the droplets should be intersecting the glass, but it makes sense.
Yes, the glass has the correct ior.
I've had some success adding planes to block some of the light, but I'm still not 100% happy with the look of the droplets.