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On Sun, 31 May 1998 05:55:18 -0500, Mike Hough <POV### [at] aol com>
wrote:
>1)A true spherical camera, such that if rendered and then mapped onto a
>sphere in POV would look just like the original scene. Such images
>could be used in VRML, Livepicture, or QTVR. I think the trick here is
>that a ray for the screen space should be matched to a sphere. I
>couldn't figure it out, but I know it can be done. I actually found
>where I think this would be added in create_ray in render.c.
The ultra_wide_angle camera type is almost what you're looking for.
If you set the angle to 360 * pi (not 360, due to a bug in render.c)
then chop off the top and bottom quarter of the image, you get an
image that would wrap correctly. If you duplicate the
ultra_wide_angle code into, say, the placeholder left for
test_camera_1, then divide y0 by 2 just before setting cy and sy, and
fix it so instead of dividing by 180 it multiplies by M_PI_180, you'll
get what you're looking for.
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