[Radiance-general] 3d Depth of a pixel

[Lars O. Grobe]

Hi!

> I need to know the z depth of each 3d point. I want an output image such
> that color of each pixel stores the info of z-depth of the corresponding
> pixel .
> in rpict i am confused in syntax. How do i use -z option ?

Didn't your command line work? I would probably avoid using the 
.hdr-extension for a depth-map, as its content are not hdr (in rgbe) but 
only floats.

Besides rpict, you could also use rtrace if you do not need the 
radiance/irradiance map but only the depth map. Probably I'd do that, as 
I could directly access the data then transparently without worrying 
about scanline ordering and reading binary files :-)

Look at the possible output values of rtrace (from 'man rtrace'):
--
(..)
-ospec    Produce output fields  according  to  spec.   Characters
           are interpreted as follows:

                  o    origin (input)

                  d    direction (normalized)

(..)

                  L    first intersection distance

(..)
                  p    point of intersection
(..)
--
So lots of data you can get for finding the first point of intersection 
seen from a point of view. vwrays gives you ray directions to shoot at 
your scene.

Maybe this is helpful, maybe someone has a working example using rpict's -z?

Cheers, Lars.