First off it's difficult to say from one person to the next what "weird" is.
However I think just maybe what you might have there is a single surface
occurring instead of the two you are supposing it to be.
For instance, if you are CSG differencing the sphere out of either a plane
or box and applying a texture to both sphere and plane (or box) then I
think all you get is one texture left over there.
So, not two refractions, only the one.

Bob

"Simen Kvaal" <sim### [at] studentmatnatuiono> wrote in message
news:390b7ec6$1@news.povray.org...
| See (small) image in p.b.i. for visual impression.
|
| I am trying to model air-bubbles in water, and ran across this problem:
| Exactly _how_ does one model the camera _in_ water, viewing bubbles of air?
| At first, I thought maybe place the camera inside an object with ior about
| 1.33 (water), then add objects (bubbles) with ior about 1.01 (air). That
| produced weird results, however exactly the same as the second method.
|
| The second method was using the law pysics: The ior is relative, I thought,
| therefore, light passing from air into water, where air has (absolute) ior
| 1.01 and water (absolute) ior 1.33, would give a relative ior of 1.33/1.01
| (water/air). When light passes from water to air, OTOH, we will get a
| relative ior of 1.01/1.33, so I simply placed camera in space, and let the
| bubbles have ior 1/1.33. That gave me exactly the same results as before. It
| seems iors below 1 is not allowed, judging from the image I get.
|
| The scene is really simple. A checkered plane with inverse applied to place
| camera outside it. (Removing inverse places the camera inside, ie into the
| water.) The sphere is just that; a sphere.
|
| I've tried several combinations; all giving more or less the same results:
| *Difference between (water-)box and sphere.
| *Difference between (water-)plane and sphere.
| *Sphere inside box.
| *Sphere inside plane.
|
| Any suggestions?
|
|
|
|

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