[Radiance-general] rtrace direction

[Vaib]

Hello again!

By doing some parametric analysis I got my answer. Actually my so called
photocell was facing the window, and since I had no sky distribution (only
sun defined in my sky file), thats why in the model there was no sky
environment (just like in outer Space). Hence the recieved irradiance at
that location was Zero. I think I am right now.

Thanks!

Best regards,
Vaibhav Jain
www.vaibhavjain.co


On 21 April 2013 11:45, Vaib <vaibhavjain.co at gmail.com> wrote:

> Hello everyone!
>
> This is my first email to the group. :)
>
> My queries are:
>
> When the input to rtrace is lets say 0 0 0 0 0 1. (X,Y,Z origin = 0; X,Y,X
> direction is from Up or 0 0 1) then:
>
> 1. Does it creates ONLY a single Ray from this point (0 0 0) towards
> direction (0 0 1), in this case normal towards Zenith? Just to make sure I
> am getting the right concepts of ray tracing.
>
> 2. If it is so, then output irradiance is from ONLY the Up direction (0 0
> 1), and not from any other direction?
>
> 3. If it is so, then: is it possible (may be a rarest of the rare case) to
> get Zero irradiance at a point from a particular direction?
>
> I am asking this because I am getting Zero irradiance at a vertical
> surface inside the room when the direction given to rtrace is normal to
> this surface. E.g for a point on North wall, the direction given is 0 -1 0.
> For all the other interior surfaces I am getting some reasonable irradiance
> values, but only for North wall its Zero. So my reasoning for this was,
> since rtrace traces only a single ray from a point towards a particular
> direction then it is possible (though rarely) to get zero irradiance from
> that direction. I just thought to get your opinion on my reasoning.
>
> All surface normals are towards inside of the room.
>
> Thank you in anticipation! Hope I made my question clear.
>
> Best regards,
> Vaibhav Jain
> www.vaibhavjain.co
>
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