=?ISO-8859-1?Q?J=F6rg_=27Yadgar=27_Bleimann?= <yaz### [at] gmxde> wrote:
> The main problem seems to be that
>
> trace(Earth_Slice, Earth_Pos,
> 2*rd*<sin(radians(-Cam_Long))*cos(radians(Cam_Lat)),
> sin(radians(Cam_Lat)), cos(radians(-Cam_Long))*cos(radians(Cam_Lat))>)
>
> which probes for the mesh, always returns zero... why?

Try adding a 4th parameter:

  #declare Norm = <0, 0, 0>; //dummy assignment
  trace(Earth_Slice, Earth_Pos,
  2*rd*<sin(radians(-Cam_Long))*cos(radians(Cam_Lat)),
  sin(radians(Cam_Lat)), cos(radians(-Cam_Long))*cos(radians(Cam_Lat))>,
  Norm)

If Norm is <0, 0, 0> after the call to trace(), then the trace has missed the
object entirely.

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