Hi globillumers --

Here is a description of a new test image.
It's from Graham Jones, who asked
me to post it for him and collect responses. Actually,
he sent this before Siggraph, and it has take me this long
to get to making a simple test image. My quick solution
(i.e. not the most accurate -- the sphere is faceted, and I
used a small number of Monte Carlo trials) is under 
pub/holly/CASE3 on tiber.nist.gov, if you want an example
of what the image is supposed to look like.
If you want to participate, send me your entry by
Nov. 24, 1993.

-- Holly



Third test case, from Graham Jones grj@physiology.oxford.ac.uk:

Geometry
--------

12  /* Number of vertices */
7   /* Number of polygons */

0  0.0  0.0  0.0
1  10.0 0.0  0.0
2  10.0 0.0  6.0
3  0.0  0.0  6.0

4  0.0  3.0  6.0
5  10.0 3.0  6.0
6  10.0 3.0  0.0
7  0.0  3.0  0.0

8  3.75 2.75 0.1
9  4.25 2.75 0.1
10 4.25 2.25 0.1
11 3.75 2.25 0.1

4
 0 1 2 3                 /* Floor, rho = 0.7 */ 
4
 4 5 6 7                 /* Ceiling, rho = 0.3 */
4
 7 6 1 0                 /* Wall, rho = 0.5 */
4
 3 4 7 0                 /* Wall, rho = 0.5 */
4
 2 5 4 3                 /* Wall, rho = 0.5 */
4
 1 6 5 2                 /* Wall, rho = 0.5 */
4
 8 9 10 11               /* Light, emmitted radiance 10 w/m^2-sr */
                         /*        rho = 0.0 */

Extra object
------------

To complete the scene place a sphere in the room

radius = 1.1
centre = 3.0, 1.1, 3.9
rho    = 0.8

View
----

>From : 9.0 1.75 1.0   To : 1.0 1.0 5.0  Up : 0.0 1.0 0.0  
Field of View : 45 degrees
Image Resolution : 96x96 pixels

Scaling of radiance values for display
--------------------------------------

Linear scaling by 3,600 and clip values over 255.





