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On Wed, 20 Nov 2002 22:56:41 +0100
"Philippe Debar" <phd### [at] wanadoo be> wrote:
> Which one? (I do not have the files here to compare : they are on
> another computer) Spectra -> rgb ?
Both WavelengthToRGB() and SpectrumToRGB() have some bits corrected.
> I must confess I changed the squared lm to lm while I was trying your
> files, but it was just because I could use the linear law more easily.
> Was the squared lm physically wrong?
Well, lm*lm here had nothing to do with the square law (the relevant
part for that is fade_power and fade_distance). In fact the intensity
multiplier part was totally arbitrary.
> I also notice that the new balanced_color is a third of the old one.
> With these two changes, I suppose the outputted color values are much
> lower. I suppose one can use something like EXPOSURE = 3000/MAX_LUMEN
> as a rough beginning value to get approximately the same results.
I don't know... I simply use trial&error to get the light level I want
(this is one of the reasons for creating the macros, indeed).
> Could I advise you to simplify your macro usage ? I would much more
> prefer to write :
>
> light_source {
> <1,2,3>*1e6
> Light_Color(cl_incandescent_60w, lm_w60_incandescent)
> Cosine_Fallof_Spot()
> point_at <9,8,7>
> }
Wow! I haven't figured out this posibility, mainly because my main
concern at first was to avoid using light_source directly. But I must
admit that your suggestion is very fine, and of course permits much more
control without adding aditional parameters to the existing light()
macro. As it must be really easy, I will add these macros soon.
> BTW, wouldn't
> be good to unify the cl/sp_sourcetype_##w and the lm_w##_sourcetype
> notation (I prefer the former, but that's just personnal taste) ?
Er... hmmm... yes, I'm that inconsistent, sorry. I will unify all
the predefined variables too. Hopefully I'm going to have plenty of free
time from now to the end of the year, at least.
--
Jaime Vives Piqueres
La Persistencia de la Ignorancia
http://www.ignorancia.org
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