[Radiance-general] RE: Luminaire octree

[Jack de Valpine]

Hi Zack,

It looks like you are getting light in your image. There seems to be a 
lot of light on the floor. Perhaps it is not working the way you expect?

One thing to do that might help at least verify the spatial location, 
would be to edit luminaire/hessamerica+++ca45-71r+++6500.rfl and make 
sure that the light source is "light" rather than "illum." This way you 
can see its location in the image. Then make a scene that only includes:

!replmarks -x luminaire/hessamerica+++ca45-71r+++6500.rfl l_ies 
scene/l_ies.rad

placed in the room. This way you can see if the distribution is working 
the way you expect (without the interference of actual fixture 
geometry). The problem that you might be facing is the size and location 
of the geometry that the distribution data is applied to vs the size and 
location of the fixture geometry. You may end up needing to custom build 
the geometry that represents the sources that the data is applied to. 
One option to assist in this is to use the -i feature of ies2rad. This 
produces a sphere with an illum material type applied to it (modified by 
the distribution function). You can specify the radius of the sphere so 
that it can enclose the relevant geometry of the fixture.

-Jack


Zack Rogers wrote:

> I have 4 IES files applied to each luminaire octree I want to create, 
> which I think is adding complexity to this issue.  I have tried what I 
> think is basically the work-around method outlined.  I am testing it 
> with this rad file:
>
> ### test_oct.rad
> void                  alias  l_room                grey_090
> !xform scene/l_room.rad
>
> !replmarks -x parts/campo_full.rad l_test_oct scene/l_test_oct.rad
> ### end file
>
> which refers to
> ### campo_full.rad
> void                  alias  l_reflector           grey_090
> !xform scene/l_reflector.rad
>
> void                  alias  l_metal               stainless_steel
> !xform scene/l_metal.rad
>
> void                  alias  l_glow                campo_glow
> !xform scene/l_glow.rad
>
> !replmarks -x luminaire/hessamerica+++ca45-71r+++6500.rfl l_ies 
> scene/l_ies.rad
> ### end file
>
> The "luminaire/hessamerica+++ca45-71r+++6500.rfl" file is basically 
> the output of ies2rad (rayfrontized) for a single ies file.  Since I 
> have 4 of these, and the default ies2rad output is a box centered 
> around the origin, i have this extra replmarks (which has used -x all 
> along) to put these 4 distributions in place relative to the luminaire 
> goemetry ( which is described by the xformed rad files rather than an 
> instanced octree -- does this matter)
>
> I still am getting no light. in my test_oct.rad scene description.  
> What am I still missing?  The only octree being made is the final 
> scene octree for "test_oct.rad".
>
> This url shows a low-quality rendering of the fixture I am dealing with:
> http://www.archenergy.com/services/sda/tools/campo/
>
> Thanks!
> Zack
>
>

-- 
#	John E. de Valpine
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#
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