For one educational project, I am trying to evaluate the effect of thick water wall on daylight distribution inside a room.
this water wall is oriented to the south with thickness about 25 cm.
I have defined a dielectric material in radiance for Water as this:
void dielectric Water
5 0.8695 0.8695 0.8695 1.33 0
#red_transmissivity green_transmissivity blue_transmissivity index_of_refraction 0
Therefore, I defined 2 surfaces for front and back and since there is just one layer of dielectric, I don't need using any interface material. But the direction of these surface is very tricky. both directions have to be toward outside (?)
should I rotate them inside in reverse ray tracing??? The resultant values are significantly different.
any comments would be really helpful for me.
thanks in advance.
Apologies for coming back so late to you. In terms of the dielectric, the normals should I believe be oriented outside of the water wall (away from the presumed body of water). The most explicit mention of this is probably from Schorsch.