[Radiance-general] Rendering of normal map

[Claus B. Madsen]

Hi Lars,

your little hint concerning glow was the final push I needed to crack 
the nut. It turned out to be even easier than I expected. Here is my 
material specification (glow, modified by colorfunc, which calls a 
normalshader.cal function file that I wrote, listed further down):

----------------------------------------------------------------

# Materials

void glow normalglow
0
0
4 1.0 1.0 1.0 -1

normalglow colorfunc normalshadermaterial
4 red green blue normalshader.cal
0
0

------------------------------------------

The normalshader.cal looks like this (thanks to Greg for making function 
files so easy to use and versatile):

{
  normalshader.cal

  Look in RADIANCE/lib/rayinit.cal for more info on builtin funcs and vars
}

red = (Nx + 1)/2;
green = (Ny + 1)/2;
blue = (Nz + 1)/2;

-------------------------------------------------------------------------


A example normal map is attached. It looks a little ugly because it is a 
triangle mesh constructed from a stereo camera scan of an outdoor scene 
(color image attached, too).

Best,

Claus


Lars O. Grobe wrote:
> Hi!
>> I wish to use Radiance to render a normal map of a scene. By normal map
>> I mean a floating point RGB image, where the RGB values of each pixel
>> correspond to the xyz coordinates of the surface normal in scene
>> coordinates. More precisely, for example for the red channel:
>>
>>     R = (Nx + 1)/2
>
> I think I'd use rtace with -oN, pipe the result to rtrace to calculate 
> your channel value, and convert the output into a radiance hdr format 
> using pvalue.
>
> I guess that, if you want to do all this with rpict and render the 
> surfaces "in your scene", you could try the glow modifier as a 
> material to modify. Just as a starting point.
>
> CU Lars.
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> Radiance-general at radiance-online.org
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