>
> I am trying to render jello. What I get is
> http://s18.postimage.org/86nwkrp4p/jello.png
> There are crossing lines on the surface. I really want to get something like
> http://s7.postimage.org/g4a0ahgrf/Untitled.png
>
> I guess there's something wrong in my refraction? Could anyone help me?
>
>

Your image looks mostly correct as it is. The lines you see are due to 
total internal reflection. They line up perfectly because you use a 
simple box object, while your reference have faces caving in.
You can acheive that using a difference starting with a box and removing 
bits of the faces with large spheres, with a mesh object or some other ways.

jello is mostly water. A correct ior should be between 1.33 and 1.34.
It's colouration is in the mass, not at the surface. You should use 
fade_color Colour fade_distance Lenght fade_power 1 (or 1001).

The sample image seems to be using photons. Please read about it in the 
ducumentation. You need a photons{} block in the global_settings and 
another for the object itself.

The code for your jello should help find any eventual problem.


Alain

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