Thin plastic chair - Ghost = How?

[maru]

Here. Not sure what specific differences you meant but I think my vray render looks more similar to your corona render.

[Ondra]

This is because you dont have a sharp light source in the scene.

[cecofuli]

Yes! GI and light coming from Global illumination (HDRI?) "hide" the solid shadows.
In fact, the base of the bottle, in Corona, is dark.

[maru]

I'm lost. What are we talking about now?

[cecofuli]

Maru, the glass is ok. I'm talking, again, on the shadow, as Keymaster did.
You and Polymax talk about glass shader =)
In the VRay version, did you turn on the parameter "Reflect on the back side"?
Or change the "Max depth" from 5 to, I don't know, 10.

[maru]

You are right, we are having two discussions in one thread here. Sorry.

To Polymax: to achieve Corona's level of detain on glass in Vray I used these settgins:

-reflect on backside for glass shader
-cutoff = 0 for glass shader
-increased max depth in glass shader and in render settings

And generally removed all biases and fakes that could be removed. This makes Vray's glass renders look as good as Corona's but again - I agree it's much easier and faster to set up a realistic looking glass in Corona.

[cecofuli]

No problem ;-) Glass and shadows are a strong argument in my opinion and both need to be in the same thread

[Polymax]

Sorry gays :)
2 Maru:
I understood in what was my error when I create Glass in Vray. Thank you!

[cecofuli]

After some test, I understand that in Progessive, Corona glass (Onesided) permits for the GI (HDRI or CoronaSky) to pass through the glass.  This is not true for direct lights rays, like VRaySun or VRayLights

[patoaltaco]

After some test, I understand that in Progessive, Corona glass (Onesided) permits for the GI (HDRI or CoronaSky) to pass through the glass.  This is not true for direct lights rays, like VRaySun or VRayLights

I had that problem, anyway i used solid material with untilded cast shadow to get sun inside with absorption on the thikness of the grlass.

Cheers,

[cecofuli]

Good idea and work around! I'll try =)

[Alessandro]

Yes, good idea. I often use this trick in my renders, also with MR, and not just for the glass.
One more solution for Corona is to decrease the opacity for the glass, for ex. 0.5, so you can adjust the effect of the direct light.

[cecofuli]

In VRay you don't need this ;-) And, if it's possible, it's better to avoid this tricks, cause the rendering look "fake".

[emieuserr]

Hi folks, somethig easy:
1 plane,1 mirror, 1 tiny plane emitter & 1 t.knot (glass)
no sun, no environment...
what do think about this?

[cecofuli]

Nice, but Bidir doesn't support absorption, it's slow and he creates some splotches.