[Radiance-general] Difference in computation time between rtrace and rfluxmtx

[Antoine Bugeat]

Hello all,

I'm a student in Civil Engineering and I use RADIANCE to make daylight
analysis in buildings.

First I did *rtrace* simulations for "point in time" analysis with a basic
set of parameter that DAYSIM uses.

After I wanted to do Climate Based simulations with the matrix method of
Daylight Coefficients. So I used *rfluxmtx.*

I'm wondering why I need to use a different set of parameters for this two
kind of simulations, especially for -ad and -lw.

I also noticed that rfluxmtx is much faster than rtrace (even with Reinhart
sky subdivision -m4) but I do not understand why.

Is there a difference in these two algorithms of calculation? Or maybe it's
my fault?

Antoine
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