[Radiance-general] Question about rtrace

[Sheng Yu]

On Thu, Jan 29, 2009 at 5:36 AM, Thomas Bleicher <tbleicher at arcor.de> wrote:
>
> On 29 Jan 2009, at 07:32, Sheng Yu wrote:
>
>> Hi,
>>
>> I am confused with what rtrace does. Does it just sample one ray at
>> the input point <xorg yorg zorg> in the direction <xdir ydir zdir> and
>> calculate the light gained from that direction, or it will sample many
>> rays through the hemisphere and calculate all the light that reaches
>> the hemisphere? In the second case, the input direction <xdir ydir
>> zdir> is the normal at point <xorg yorg zorg>.
>
> See the man page, '-I' (uppercase 'i') option:
>
> -I      Boolean switch to compute irradiance  rather  than  radiance,
>        with  the  input  origin and direction interpreted instead as
>        measurement point and orientation.
>
>
> Regards,
> Thomas
>
Thanks a lot, this is exactly what I want.