> Hi, I'm a physicist that uses POVRAY to visualize crystal structures and
> electronic properties of materials.
>
> I have generated the following image with POVRAY
>
> http://yfrog.com/0sdefaulteop
>
> Now if I set the background from black (0,0,0) to white (255, 255, 255) I get
> the following image:
>
> http://yfrog.com/n4whitebackgroundp
>
> Notice that a lot of the blue stuff in the corners and edges of the box is now
> missing.
>
> The header (and so probably the relevant info) of my .pov file is below
>
> #declare camera_location =<-0.10, -0.50, 0.90>;
> #declare camera_look_at =<0.00, 0.00, -0.00>;
> #declare camera_scale = 22.17;
> #declare light_location = camera_location - camera_look_at;
> #declare light_scale = 1e6;
> #declare color_light = rgb<2.00, 2.00, 2.00>;
> #declare color_background = rgb<0.00, 0.00, 0.00>;
> #declare radius_frame = 0.01;
> #declare color_frame = rgb<0.75, 0.75, 0.75>;
> #declare color_box = rgbf<1.00, 1.00, 1.00, 0.75>;
> #declare length_axis = 3.82;
> #declare radius_axis = 0.08;
> #declare color_axis_x = rgb<1.00, 0.00, 0.00>;
> #declare color_axis_y = rgb<0.00, 1.00, 0.00>;
> #declare color_axis_z = rgb<0.00, 0.00, 1.00>;
> #declare length_arrow = 0.2 * length_axis;
> #declare radius_arrow = 2.0 * radius_axis;
> #declare color_arrow_x = color_axis_x;
> #declare color_arrow_y = color_axis_y;
> #declare color_arrow_z = color_axis_z;
> #declare radius_atom_si = 0.42;
> #declare radius_bond_si = 0.15;
> #declare color_atom_si = rgb<0.50, 0.60, 0.60>;
> #declare color_bond_si = rgb<0.50, 0.60, 0.60>;
> #declare radius_atom_p = 0.39;
> #declare radius_bond_p = 0.15;
> #declare color_atom_p = rgb<1.00, 0.50, 0.00>;
> #declare color_bond_p = rgb<1.00, 0.50, 0.00>;
> #declare color_isosurface_positive = rgbf<0.40, 0.40, 0.80, 0.75>;
> #declare color_isosurface_negative = rgbf<0.80, 0.40, 0.40, 0.75>;
>
> The blue surface is defined by the color_isosurface flags at the bottom, and
> setting those from a rgbf to a purely rgb setting fixes the missing surface that
> I have in that picture. However, I want my iamage to be semi-transparent. Is
> there anything I can do?
>
> Thanks so much for your help!
>
>
>

I made some tests using a few concentrical spheres using your color.
No problem if I use a background of rgb 1 or rgb 2.
Increasing the rgb value beyong that and I see surfaces disapearing.

As you used rgb 255 for the background, there is no way that you could 
see all surfaces. It cuts through the first 4 surfaces.




Alain

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