Try making sure that the volume of water, or whatever liquid, is a fraction
smaller than the inside area.
for example:
object {
    union {
        difference {
            cylinder { <0.0, 0.000001, 0.0> <0.0, 5.0, 0.0> 1.5 }
            cylinder { <0.0, 0.25, 0.0> <0.0, 5.000001, 0.0> 1.375 }
                texture { NBglass }
            }
            cylinder { <0.0, 0.250001, 0.0> <0.0, 3.5, 0.0> 1.3749999 }
        }
            texture { WaterTex... }
    }

A.D.B

Chris Purdy wrote:

> Hi all... I am wondering why I'm getting all the speckles at the bottom of
> the glass in this picture.  Using Photons... heres the settings:
> #version 3.5;
>
> #declare Photons=on;
>
> global_settings {
>   assumed_gamma 1.0
>   max_trace_level 5
>   #if (Photons)          // global photon block
>     photons {
>       spacing 0.01                 // specify the density of photons
>
>     }
>
>   #end
> }
>
>  [Image]

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