Re: soft light as "light photon emitter shader" problem

[Luc Froelicher <lulu(at)alamaison.fr>]

digging deeper on this one ,  it seems that the "soft light" shader , 
when connected as a "light Photon Emitter Shader"
always behaves as a Point light (ie emitting photons all over the place 
...) and don't respect the light type (spot light in my case).
shall I call that a bug , or a limitation ?
I 'm trying to color the photons/caustics according to "mib_cie_d 
temperature" and I didn't find how to do that (using a spot light) for 
the moment.

Luc Froelicher a écrit :
> I've got a strange behaviour here ...
>
> I'm using a soft light with a mib_cie_d shader connected to his color 
> input.
> I'm calculating caustics . the scene is a glass (dielectric material 
> or lglass) object on a diffuse plane , really standart.
>
> in order to get the right color for my caustics (given in Kelvin in 
> the mib_cie_d),
> I connected the soft light shader to the "light Photon Emitter Shader" 
> slot of the light ,
> toggled the "Use light color as Energy" in the Photon section of the 
> soft light ... and my caustics are now correctly colored (according to 
> mib_cie_d temperature) .
>
> Meanwhile I noticed that , by connecting the softlight to the  , the 
> rendering times doubled.
> looking at mental ray logs :
>
> soft light not connected :
> 'INFO : RCGI 0.2  info : light #0 (Spot_Root1/spot_cyclo), caustic 
> emission,  emitted: 4183803,  stored: 5005
> 'INFO : RCGI 0.2  info :   caustic   light #0: light photons        
> 4183803
> 'INFO : RCGI 0.2  info :   caustic   light #0: spec. refl. photons     
> 6843
> 'INFO : RCGI 0.2  info :   caustic   light #0: spec. refr. photons    
> 10085
> 'INFO : RCGI 0.2  info : optimizing access to caustic Photon Map with 
> 5005 photons
>
> soft light connected as a light Photon Emitter Shader :
> INFO : RCGI 0.2  info : light #0 (Spot_Root1/spot_cyclo), caustic 
> emission,  emitted: 9524100,  stored: 5005
> 'INFO : RCGI 0.2  info :   caustic   light #0: light photons        
> 9524100
> 'INFO : RCGI 0.2  info :   caustic   light #0: spec. refl. photons     
> 7241
> 'INFO : RCGI 0.2  info :   caustic   light #0: spec. refr. photons    
> 10078
> 'INFO : RCGI 0.2  info : optimizing access to caustic Photon Map with 
> 5005 photons
>
> so , if I understand correctly , in the second case it has to emit the 
> double amount of photons to store 5000 photons at the end.
> is there a logical reason for that , or am I misunderstanding 
> something ... ?
>
> luc
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