Thanks,

i will try this, perhaps the background can be done more lightended with
this, and without the anoing search for the best camera-point ...

Hartmut

Joshua English schrieb in Nachricht <38BCA0C0.E33678C6@spiritone.com>...
>It is possible to use a background image in POV-Ray. It requires some code
>based on (I'm pretty sure) John VanSickles work:
>
>#local CamE = <0.0,0,3.0>; //where the camera's look_at is
>#local CamL = <1,0.5,-1>; //where the camera's location is
>#local CamZ = 2; //the amount of camera zoom you want
>#local CamA = 4/3; // camera aspect ratio
>#local CamS = <0,1,0>;
>#local CamD = vnormalize(CamE-CamL);
>#local CamR = vnormalize(vcross(CamS,CamD));
>#local CamU = vnormalize(vcross(CamD,CamR));
>
>#local cam_dir = CamD * CamZ;
>#local cam_right = CamR * CamA;
>
>#declare fz = vlength(cam_dir);
>#declare fx = vlength(cam_right)/2;
>#declare fy = vlength(CamU)/2;
>
>#local nz = vnormalize(CamE-CamL);
>#local nx = vnormalize(vcross(CamS,nz));
>#local ny = vcross(nz,nx);
>
>
>camera {
>  location CamL
>  up CamU
>  right CamR*CamA
>  direction CamD*CamZ
>}
>
>union{
>  triangle { <fx,fy,0> <-fx,fy,0> <-fx*1.1,-fy,0> }
>  triangle { <fx,fy,0> <fx,-fy,0> <-fx*1.1,-fy,0> }
>  texture { //texture information }
>  translate fz*z
>  scale 2000
>  matrix <nx.x,nx.y,nx.z,
>            ny.x,ny.y,ny.z,
>            nz.x,nz.y,nz.z,
>            CamL.x,CamL.y,CamL.z>
>  no_shadow }
>
>The scale can be anything. This should keep an image the same size when
it's
>rendered. Just keep track of where those triangles are, you have to place
the
>image map carefully.
>
>Josh
>Hartmut Wagener wrote:
>
>> Here is a picture made several months ago. I had not found a function for
a
>> background-image, so the image and the fake-stuff had to be put before
the
>> camera. The fake-stuff is a function in pov-ray (some fourier-functions).
>> The reason to fake this was to put something like a "alien-head" to the
>> data-line, but someone with photo-shop was faster ...
>>
>> Hartmut
>>
>> http://www.killozap.de
>>
>>  [Image]
>

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