inverse cubemap?

Neox

Hiho guys i'm currently playing around alot with shaders and for a pretty specific effect i was searching for something that acts like an inverted cubemap.
To make it clear, a cubemap acts like a reflections to show stuff that is around and therefore outside the object, what id love to do is using a map that acts as if there is something inside an Object.
And to make it even easier, i can't use custom code, only what unreal tournament gives me ^^

ok here is an example of what i want to do

i just added a subsurface scattering Fake to one of our shaders, however in the case of the whale, i want him to have stuff in his belly, the current texture are just cubes that are reflected nothing too fancy but if i could actually make it look like there is something inside, this would be awesome



:edit:

ok i guess this is as close as i can get with a cubemap, but that could be tweaked for sure to work a bit ebtter with the mode


of course everything but the belly will be masked out

TSM

Why don't you just make a cube map of the whales interior? You may need to clone the whale, 1 part scale it up, and apply that cubemap to the smaller piece, while keeping a translucent SSS on the outer piece, so you can see inside.

Just some thoughts.

Tumerboy

Neox, do you mean you want it to look like it's illuminated, and there are shadows and such of the interior bits? (finger over a flashlight type of thing?) Or do you want it to look semi-transparent, so you can actually see what's in there?

I'm confused.

Mark Dygert

humm... do you want it to slide around like a cube map or look like something is stationary inside. I'm not a shader wiz by any stretch so who knows what is possible. But I think it might be easier to model a simple silhouette to place inside?

Neox

no because i cannot use any half transparancies for that so it has to be faked within the shader

@tsm thats what im doing now, but a reflection is nt the same like looking throiugh something an see whats in it, but i guess this is as close as i can get it

arrangemonk

http://www.humus.name/index.php?page=News&ID=209

Xoliul

I think you might need to use refraction-like cubemap sampling ? ShaderFX has a node and examples for that I think. I've never used it since refracting only a cubemap and not the objects behind 8(like glass) is totally useless, so I don't know the code off the top of my head, but could be what you want ?