silly question.. may be

just to double check...

what happens if I have a glow or light material on a surface and I
switch between illuminance and luminance calculation (rvu or rpict),

Are the numbers going to change (from cd/sqm to lx) or are still the
same on the surface?

I would expect that if I have 100cd/sqm I would get 314lx and to see the
number change.

BUT It doesn't seem to work this way, in fact the number still is 100...

I tried with rvu and the -i option do not affect this...

I am thinking of a typical application where to save time and energy you
just stick a glow to a surface that has a known average illuminance and
it is lambertian... not terribly accurate but FAST.

The results would look odd to me: the illuminance map would have a
1/3.14 reduction for the values on the glowing surface...

Is this ok?

Ciao

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Hi Guilio,

The -i option to rpict/rtrace only affects opaque, reflective materials. It does not change the results for light sources or glow surfaces, or glass for that matter.

-Greg

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From: "Giulio Antonutto" <[email protected]>
Date: July 25, 2006 11:53:43 AM PDT
To: <[email protected]>
just to double check...

what happens if I have a glow or light material on a surface and I switch between illuminance and luminance calculation (rvu or rpict),

Are the numbers going to change (from cd/sqm to lx) or are still the same on the surface?

I would expect that if I have 100cd/sqm I would get 314lx and to see the number change.

BUT It doesn’t seem to work this way, in fact the number still is 100...

I tried with rvu and the -i option do not affect this...

I am thinking of a typical application where to save time and energy you just stick a glow to a surface that has a known average illuminance and it is lambertian... not terribly accurate but FAST.

The results would look odd to me: the illuminance map would have a 1/3.14 reduction for the values on the glowing surface...

Is this ok?

Ciao

>

thanks greg :slight_smile:
all is ok then
ciao
G

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