I declared a photovoltaic unit
by having an aluminium frame
and all the other surface with
silicone behind glas


#declare GEMINI_t_PV_Unit = texture
{ material_map
   { gif "map-pv.gif"
     texture { GEMINI_t_Aluminium }
     texture { GEMINI_t_PV_Silizium }
     texture { GEMINI_t_PV_Silizium }
     texture { GEMINI_t_PV_Silizium }
   }  // material_map
}  // texture

As mentioned in May this year,
I made an animation with this.

Some pictures had been rendered,
as all the photovoltaic is only made
from aluminium.

Now I solved the failure.
The GIF with the material map was wrong.

The picuture had only 2 colors.
Color Index 0 was the aluminium
but the silicone was at color index 246

I reduced the GIF to 16 colors and wrote

#declare GEMINI_t_PV_Unit = texture
{ material_map
   { gif "map-pv.gif"
     texture { GEMINI_t_Aluminium }
     texture { GEMINI_t_PV_Silizium }
     texture { GEMINI_t_PV_Silizium }
     texture { GEMINI_t_PV_Silizium }
     texture { GEMINI_t_PV_Silizium }
     texture { GEMINI_t_PV_Silizium }
     texture { GEMINI_t_PV_Silizium }
     texture { GEMINI_t_PV_Silizium }
     texture { GEMINI_t_PV_Silizium }
     texture { GEMINI_t_PV_Silizium }
     texture { GEMINI_t_PV_Silizium }
     texture { GEMINI_t_PV_Silizium }
     texture { GEMINI_t_PV_Silizium }
     texture { GEMINI_t_PV_Silizium }
     texture { GEMINI_t_PV_Silizium }
   }  // material_map
}  // texture

Now the whole animation renders correct.
So the reason for the random failures
at some pictures had been the
incorrect GIF.

best regards

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