[Radiance-general] [Radiance-dev] Modelling an LED Monitor with a Beam Pattern & Display Image

[Gregory J. Ward]

Hi Andrei,

This probably belongs on the radiance-general list, since it's not really a code issue.  I am cross-posting there.

There may be something amiss with your Mockup_Lamp_BeamPattern.dat file to brightdata.  How did you create this file, and what values are in it?

I don't know why this would affect the colors, unless there is clipping going on in your rendered images.  This could just be a magnitude issue.

-Greg

> From: "Kolomenski, Andrei (JSC-SF311)[WYLE LABORATORIES, INC.]" <andrei.kolomenski at nasa.gov>
> Date: June 28, 2016 2:04:10 PM PDT
> To: "radiance-dev at radiance-online.org" <radiance-dev at radiance-online.org>
> 
> Hello Radiance Experts,
>  
> I want to model an LED monitor with a measured beam pattern. Also, I want to superimpose an image on the monitor such that the light projected through the image is affected by the monitor’s beam pattern.
>  
> I’m running into trouble with my current procedure (INCORRECT IMAGE COLORS -  TOP IMAGE), it produces a monitor image that appears to be color inverted, also the image surface has 0 radiance even though it is applied to a light primitive that has a radiance definition.
>  
> See top display image doesn’t look like the bottom one, also the top image has no light output: https://s31.postimg.org/8cal8he6j/Monitor_Dif.png
>  
> ******* INCORRECT IMAGE COLORS -  TOP IMAGE ********
> void brightdata Monitor_BeamPattern
> 5 flatcorr Mockup_Lamp_BeamPattern.dat source.cal src_theta src_phi
> 0
> 1 1
>  
> Monitor_BeamPattern colorpict monitor_image2
> 9 clip_r clip_g clip_b Image.hdr picture.cal pic_u pic_v -s 0.254
> 0
> 0
>  
> monitor_image2 light monitor2_background
> 0
> 0
> 3 10 10 10
>  
> monitor2_background polygon monitor_surface2
> 0
> 0
> 12
> 0 0 0
> 0.444 0 0
> 0.444 0.254 0
> 0 0.254 0
>  
> ******* CORRECT IMAGE COLORS BUT NO BEAM PATTERN -  BOTTOM IMAGE ********
> void colorpict monitor_image3
> 9 clip_r clip_g clip_b Image.hdr picture.cal pic_u pic_v -s 0.254
> 0
> 0
>  
> monitor_image3 light monitor3_background
> 0
> 0
> 3 10 10 10
>  
> monitor3_background polygon monitor_surface3
> 0
> 0
> 12
> 0 0 0
> 0.444 0 0
> 0.444 0.254 0
> 0 0.254 0
>  
> Why is the top definition, using brightdata, produce a color distorted image, that has no luminance? Advice on modelling a monitor will be much appreciated!
>  
> Thank you for your time,
> Andrei Kolomenski
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