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I'm posting this because I'm a bit confused about how "hidden to GI" and "hidden to camera + hidden to reflections/refractions" options are working.

Let's see some images about something similar to a pool scene where I removed two walls to see what happens under the water:

1.- A very subdivided plane with some noise applied with a water material; object hidden to GI:


2.- A copy of the same plane with a material made to simulate caustics (no real caustics or refraction involved); this object is hidden to camera and to reflections/refractions:


3.- Both objects together; hidden to GI object is located a bit above hidden to camera/reflections/refractions one; this is almost the result I expected (notice the real reflected caustics on the wall are missing):


4.- This is the same scene as point 3 but hidden to GI object is under the other one; this is what I find odd as I expected the same as 3:


Is this ok? Is it a bug?

Fernando Tella wrote:Is this ok? Is it a bug?

No, not a bug. Because the object above (hidden to reflection/refraction) won't let the rays pass through.

-edit: Sorry, not Hidden to GI, I meant "Hidden to reflection/refraction" as corrected above

Well, it let's the rays go through in the first image.

The object hidden to camera has something like an AGS material applied; there are no refracted rays.

I'm pretty sure it didn't work like that in 1.7; I'm trying to use this method with MW2 materials: http://www.maxwellrender.com/forum/view ... s&start=30

Here go two images that will explain it more clearly:




Objects hidden to GI don't understand light going through layer clipping. Again, is it ok?

Edited my first reply. What about the setup of leaf scene?

This is the leaf material:
http://www.ftella.com/links/Leaf.zip

In the last image the leaf plane is vertical making a dihedral; half the plane is above the water plane level (hidden to GI) and half is below.
The rays that go through the clipped part cast shadows on the floor of the pool when they go through the water object (hidden to GI).

tom wrote:Edited my first reply.

The object hidden to reflection/refraction should not block anything as it is not refracting light at all; it is an opaque object and it has a caustics-like texture acting as a clipmap to let the light through. It has the same problem as the leaf, the clipping still generates shadows when the rays goes through this hidden to GI objects.

Fernando Tella wrote:it is an opaque object and it has a caustics-like texture acting as a clipmap to let the light through

Well, but I didn't know this. So, you're right. Checking your scene ASAP Thanks!

Thank you Tom

tom wrote:Well, but I didn't know this.

Hey! This is what I wrote above the second image:

a material made to simulate caustics (no real caustics or refraction involved)

That should be enough, right? I think I should have been more specific.

Do you want me to send you the scene? It's pretty easy to reproduce.

Fernando Tella wrote:That should be enough, right? I think I should have been more specific.

You're right! Sometimes, it's not easy grabbing the details in between daily mess, sorry.

Fernando, this should be fixed in 2.0.3. Could you please confirm?

Yep!

Everything is ok now:




Thanks a lot Tom (and the rest of the crew too of course).

Thanks to you Fernando!