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photometric output with both up and down components

6 ANTWORTEN 6
GELÖST
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Nachricht 1 von 7
Anonymous
1849 Aufrufe, 6 Antworten

photometric output with both up and down components

Has anyone got a good solution for modeling and rendering light fixtures using .ies files that have both an up and down light component to them? Most families out there seem to have the .ies file located just below the geometry for a fixture shining downward (and just above for uplight). Problem is, when the light shines both up and down, the geometry itself blocks the light from the photometric file from reaching surfaces on the opposite side. See attached images of two identical families using the same .ies file - the one difference being that I've deleted the geometry for the horizontal surfaces of the housing and lens that block the light from the .ies file.

 

I remember a time when rendering with some other software, that there was a setting to make certain geometry "not cast shadows", so light would pass right through the geometry of the object.

 

The only hack I can come up with would be to have a nested family to provide a second light source shining up, but that's not good if software other than Revit uses the info for lighting calculations or if it properly distributes the light ignoring the geometry of the light.

 

Thoughts? Is this one for the wishlist? Does 3DS or another rendering engine handle the light differently?

 

 

6 ANTWORTEN 6
Nachricht 2 von 7
L.Maas
als Antwort auf: Anonymous

If the material blocks the light depends on the material settings. If materials have a transparency value then they will let light through

For example see light hereunder where I only hanged the material of the backside into a glass type material

 

 

LightNT.png

LightT.png

Louis

EESignature

Please mention Revit version, especially when uploading Revit files.

Nachricht 3 von 7
Anonymous
als Antwort auf: L.Maas

Thanks, Louis, for the additional workaround. Unfortunately, this does not work for me in most cases, as the geometry of the light fixture will need to be visible, and the lens rendered with a glowing material that isn't transparent. I will look into material settings further to see if I can come up with one that does not distort the light output and still renders as an illuminated lens would.

Nachricht 4 von 7
L.Maas
als Antwort auf: Anonymous

Depending on the material you can have different material settings.

For example a material we often use for diffusers. As you can see it has both self illuminance and transparency settings

 

Light.png

So this material is visible, self illuminating and transparent. It is based on the "Glass, White, High Luminance" material form Autodesk materials

Louis

EESignature

Please mention Revit version, especially when uploading Revit files.

Nachricht 5 von 7
Anonymous
als Antwort auf: L.Maas

So can we turn on transparency so as not to occluded the ies file but have the luminaire geometry render as opaque ?
Nachricht 6 von 7
Anonymous
als Antwort auf: Anonymous

Hi, 

Please clarify if it is possible to turn on transparency so as not to occlude the ies file but have the luminaire geometry render as opaque.

 

I'm trying to create a Direct/Indirect suspended linear luminaire that looks like this:

apitt6Z73S_1-1615377862781.png

 

The geometry is a simple cuboid. 6 rectangular faces. 2 different Revit materials; A  "glow" material for the horizontal faces and a grey material for everything else.  Note that the grey material for the sides of the luminaire is opaque and needs to render as such.  

The ies file looks like this.

 

apitt6Z73S_0-1615377706698.png

 

Where should I position the ies file within my cuboid for it to render correctly? And what material settings for the two materials so as not to occlude the ies light output?

 

Thanks in advance for the clarification.

 

Kind regards,

 

Alex

 

Nachricht 7 von 7
chris.morse
als Antwort auf: Anonymous

"So can we turn on transparency so as not to occluded the ies file but have the luminaire geometry render as opaque?"

 

Simple question that we all need an answer to, as the ies file already accounts for fixture geometry.  If the answer is "no" at least we can stop struggling to find a solution.  Troubleshooting this, at least for me has wasted an embarrassing amount of time.  Capture.JPG

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