[Radiance-general] perfect specular reflection in rtrace

[Antoine Bugeat]

Hello all,

I'm a civil engineering student and I'm trying to compute the impact of
specular reflections in a street "canyon".
My problem is:
I use rtrace function with the basic parameters, the same as DAYSIM uses
(-I -aa 0.1 -ab 5 -ad 1000 -ar 300 -as 20 -dj 0 -dr 5 -ds 0.2 -dp 512 -lr 6
-lw 0.004 -st 0.1 -oov)
My sky and sun description come from gendaylit.
My wall is defined by a perfect specular plastic and the ground is defined
by a diffuse material.

When I do the simulation, I get illogical results as if the specular
reflection of the walls had no impact.

So, I tried to simulate a really simple scene with only one *specular
surface*:

void plastic M_Spec
0
0
5 0 0 0 1 0

M_Spec polygon 1
0
0
12 -5.0 0.0 -5.0
-5.0 0.0 5.0
5.0 0.0 5.0
5.0 0.0 -5.0

My *source* is described as a sun perfectly perpendicular to the surface:

void light solar
0
0
3 1000 1000 1000

solar source sun
0
0
4 0.0 -1.0 0.0 0.5

And the *sensor* is between the surface and the source and is regarding
right to the surface:

0.0 -5.0 0.0 0.0 1.0 0.0

And in this case, I get 0 after my rtrace simulation.
I tried to vary some parameters of rtrace (direct and specular parameters)
but it change nothing I still get 0.

Thank you for your help.

Antoine Bugeat
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