Refraction color bring a milky effect (build8)

[Micha_cg]

Refraction color bring a milky effect (build

My theory, the internal reflections are limited. Do you see the grey field "max depth" = 5. Maybe this option is internal acitve.

Do you mean with your test, you dosn't get the strange color effect? Try to use an arelight above the dino and set the refraction color to red. I have the feeling, the effect is directed to the light source.

Micha

[flipside]

Refraction color bring a milky effect (build

I used are lights with the store with ir map option.

here is a test, white environment color, only default light. Grey diffuse, red refraction color (no reflection). It looks blue. With black diffuse it doesn't look blue. I assume that you also had grey diffuse in your tests. Or what do you mean by 'no diffuse'? No diffuse would be black, not grey.



Here a test with GI environment (white), same material. This doesn't look blue, the darker color is a reddish tint.




Still is weird why the object doesn't look like a solid color if the environment is totally 1 solid color, and the material has no reflection.

The max depth in material is smth weird, in the globals this option also doesn't work I as would expect it to.

[Micha_cg]

Refraction color bring a milky effect (build

I will post my full test scene tomorrow. Today I will go to bed now.

[flipside]

Refraction color bring a milky effect (build

The lights have something to do with the blue stuff:

grey diffuse, red refraction, one area light:



same material, but light is now 'store with ir map'

[Micha_cg]

Refraction color bring a milky effect (build

Here the file and the image from it:

http://www.simulacrum.de/download/Re...seColorBug.3dm

[joe_b]

Refraction color bring a milky effect (build

Also, the cutoff value in options doesn't seem to have an effect when only refraction is used. Is this normal?

I'll check to see if the value is being properly used

[flipside]

Refraction color bring a milky effect (build

Ok I have reproduced the black refraction effect in 3ds max.

If in max I use a refraction color white, with normal settings, and I put the dino in a white environment, the whole dino is white.

If I decrease the max depth in the material to 2, the dino is still white.

But if I then turn on the exit color, which is set to black, the dino is rendered as in rhino:


So as I already though, the max depth for refraction in rhino doesn't work anymore. it is by default set to 2, with a black exit color. I think it would be good if we could specify that exit color, or choose to turn it off, as in max. In max, when exit color is turned off, the color of the environment is chosen as the exit color (I think).

Here's a test in rhino with my wineglass:


I assume that the global max depth doesn't work either.

[Micha_cg]

Refraction color bring a milky effect (build

Wouter, great that you confirm the bugs.

[joe_b]

Refraction color bring a milky effect (build

So as I already though, the max depth for refraction in rhino doesn't work anymore. it is by default set to 2, with a black exit color. I think it would be good if we could specify that exit color, or choose to turn it off, as in max. In max, when exit color is turned off, the color of the environment is chosen as the exit color (I think).

Well on my initial check, I looked in Vlado's code for his GlassBRDFs and they are still making use of the global max depth variable. I checked that the global max_depth is actually making it correctly to VRay, so I guess there is something more subtle happening. I'll continue looking into this and will contact Vlado for his thoughts on the matter as well

[cafer]

Refraction color bring a milky effect (build

Hi Micha,

Uncheck "Double-Sided" in Material Editor Options rollout and turn on Fresnel Reflections should help.

[joe_b]

Refraction color bring a milky effect (build

Hi Micha,

Uncheck "Double-Sided" in Material Editor Options rollout and turn on Fresnel Reflections should help.

I'm not sure why your post isn't showing this image properly...

[Micha_cg]

Refraction color bring a milky effect (build

Hi Micha,

Uncheck "Double-Sided" in Material Editor Options rollout and turn on Fresnel Reflections should help.

Thank you. It works. The black area problem is solved. Also the global max depth option works.

I ask me now, will it be better if the "Double-Sided" option is unchecked per automatic if the material work in refraction mode? Or should be "Double-Sided" unchecked per default allways? I have the feeling this should be the standard mode.

[flipside]

Refraction color bring a milky effect (build

Sorry, but it doesn't work... You're clearing up the black parts because of reflections kicking in.

Try it without reflection, you'll see it's wrong. There is definatly a problem in refraction:
http://www.aversis.be/vrayrhino/dino_refract.zip

Just open, and render the persp viewport. It is a black diffuse, white refraction, no reflection material, double sided is turned off. In a white environment color. If I render the same in max, I get a fully white image, which is normal.

[joe_b]

Refraction color bring a milky effect (build

I ask me now, will it be better if the "Double-Sided" option is unchecked per automatic if the material work in refraction mode? Or should be "Double-Sided" unchecked per default allways? I have the feeling this should be the standard mode.

Yes this has been discussed and is on my list for this round of UI fun and excitement. What is going to happen is the option will grey out and not be used whenever a refraction layer is added to the material.

[Micha_cg]

Refraction color bring a milky effect (build

... What is going to happen is the option will grey out and not be used whenever a refraction layer is added to the material.

I think, it will be good so.