[Radiance-general] RE: 60Watt bulb luminaries data
Anthony J. Farrell
anthony.farrell at dit.ie
Wed Jun 30 13:42:55 CEST 2004
I am currently carrying out basic validation techniques of the Radiance
software using a black box and standard 60Watt bulb therein.
I cannot locate a standard incandescent 60W bulb (just bare hung from
ceiling, no lamp shade) on the desktop radiance program.
Can anyone help me by way of an add on file for a standard light bulb (even
if not 60W!) or refer me to a suitable IESNA file?
Kind regards
Anthony
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Today's Topics:
1. Re: Illuminance calculation on a virtual surface? (gward at lmi.net)
2. Re: colorpict and materials (Lars O. Grobe)
3. Re: colorpict and materials (Jack de Valpine)
----------------------------------------------------------------------
Message: 1
Date: Tue, 29 Jun 2004 04:18:48 -0700
From: gward at lmi.net
Subject: Re: [Radiance-general] Illuminance calculation on a virtual
surface?
To: rpg at rumblestrip.org, Radiance general discussion
<radiance-general at radiance-online.org>
Message-ID: <1088507928.40e1501822b7c at webmail.lmi.net>
Content-Type: text/plain; charset=ISO-8859-1
OK, Rob -- you got me. Your little trick would work. I don't think he
really needs it, though, since he already has a method for generating
the grid points for rtrace. He can simply increase the resolution of
the grid he already has (as Raphael suggested) and/or upsample the
result using pfilt. Or your method. All will work.
-Greg
Quoting Rob Guglielmetti <rpg at rumblestrip.org>:
> Hi Greg, Hi John,
>
> Greg Ward wrote:
>
> > No good. Trans gets ignored by the rpict -i option. Just use pfilt to
> > scale the illuminance map if it's not big enough. (John M's suggestion
> > -- he's sitting next to me in Leicester.)
>
> Oh yeah? =8-p
>
> vwrays -x XRES -y YRES -vf viewfile -fd | rtrace -h -fd -opn octree \
> | rtrace -fdc -I render_options -x XRES -y YRES octree > illum_picture.pic
>
> Greg, does this look familiar? A little ditty from a year or so ago?
> You sent me this tip when I asked you how to get illuminance on a
> building's curtain wall. The first rtrace computes the intersection
> point (which is fast) and the second rtrace does the illuminance
> calculation. Cool, yes? Yes.
>
> Now, given this little tip, could he use trans as I described?
>
------------------------------
Message: 2
Date: Tue, 29 Jun 2004 14:34:03 +0300
From: Lars O. Grobe <grobe at gmx.net>
Subject: Re: [Radiance-general] colorpict and materials
To: Radiance general discussion <radiance-general at radiance-online.org>
Message-ID: <38C05080-C9C0-11D8-ACAF-000A959DDB22 at gmx.net>
Content-Type: text/plain; charset=US-ASCII; format=flowed
Hi,
sorry, so again, I try to be clear in asking this time ;-) By the way,
have nice holidays (I hope that's the reason for your travel ;-)!
All is about the question how to map pictures onto a surface without
corrupting its material properties. I understand that colorpict
multiplies the material color components with those of the picture.
If I have a grayscale image processed by normpat (which means that the
average gray value is 1.0) and apply it to a material, the overall
color and brightness will remain the same. So I get the "pattern" from
the image, but the surface still has the correct material properties
(color, brightness etc). I used this so far.
Now I want to use a colored picture for mapping. I also apply normpat
to it, so, as far as I understand, the average of all R, G and B must
be 1.0, right? For example, I use a normpat'ed picture of green marble.
I than apply this using colorpict to a surface, which has a "marble"
material. Will the overall color and brightness still be that of the
defined material, as the picture map has the average of 1.0?
The background: I try to use exact data for material definitions, but
the image maps can't all be color corrected. So I want the overall
color and brightness from defined materials, e.g. from the plastic
material, and use the map only for what I would call "local color
variation". The reason is that I have e.g. red marble, got its color,
brightness and all that defined as plastic marble. But the marble has
blue particles which won't appear if I use a grayscale imagemap. So I
want to use a normpat'ed (NOT colorcorrected e.g. by macbethcal!) to
bring these blue parts onto the surface. The whole surface however must
still have the average color of my plastic marble material.
If I understand the man-page of normpat, that's just what it was
invented for. However, I am a bit unsure, as all Radiance documentation
uses colorpict with a bright white material.
TIA+CU, Lars.
--
Lars O. Grobe
grobe at gmx.net
------------------------------
Message: 3
Date: Tue, 29 Jun 2004 09:38:59 -0400
From: Jack de Valpine <jedev at visarc.com>
Subject: Re: [Radiance-general] colorpict and materials
To: Radiance general discussion <radiance-general at radiance-online.org>
Message-ID: <40E170F3.9040504 at visarc.com>
Content-Type: text/plain; charset="us-ascii"
Hi Lars,
I believe that what you need to do is take your colorpict modifier and
apply it to a material such as a plastic that uses the reflectance of
your material sample as the rgb parameters. I believe that you DO want
to use macbethcal to callibrate the color values of the image and
determine an estimated reflectance. Then using normpat on the image will
move the values in image so the average is 1.0.
So steps as follows:
1. acquire sample material image by photography, scan....
2. callibrate sample image with macbethcal
3. use callibrated sample image to estimate average color
4. calculate reflectance based on average color values, grey(r,g,b)
5. normpat the callibrated image
Then create material as follows:
void colorpict color.image.pattern
7 red green blue <normpat picture>.pic picture.cal Px Py
0
1 <aspect>
color.image.pattern plastic color.image.material
0
0
5 <grey(r,g,b)> <grey(r,g,b)> <grey(r,g,b)> <s> <r>
Since the colorpict is normalized to an average value of one, it will
modify the plastic around the reflectance of the plastic. For example,
if colorpict returns 1.1 for red then the red of the plastic will be 10%
brighter.
In short I think that there are two main ways to use colorpict
1. final reflectance set by colorpict image - colorpict is used to
set final reflectance of material, that is use callibrated image
colorpict modifier and material with reflectance of 1.0
2. final reflectance set by base material - colorpict is used to
modify reflectance set by material, that is normpat image
colorpict modifier is used to modify reflectance set by material
I hope this is helpful.
Regards,
-Jack
Lars O. Grobe wrote:
> Hi,
>
> sorry, so again, I try to be clear in asking this time ;-) By the way,
> have nice holidays (I hope that's the reason for your travel ;-)!
>
> All is about the question how to map pictures onto a surface without
> corrupting its material properties. I understand that colorpict
> multiplies the material color components with those of the picture.
>
> If I have a grayscale image processed by normpat (which means that the
> average gray value is 1.0) and apply it to a material, the overall
> color and brightness will remain the same. So I get the "pattern" from
> the image, but the surface still has the correct material properties
> (color, brightness etc). I used this so far.
>
> Now I want to use a colored picture for mapping. I also apply normpat
> to it, so, as far as I understand, the average of all R, G and B must
> be 1.0, right? For example, I use a normpat'ed picture of green
> marble. I than apply this using colorpict to a surface, which has a
> "marble" material. Will the overall color and brightness still be that
> of the defined material, as the picture map has the average of 1.0?
>
> The background: I try to use exact data for material definitions, but
> the image maps can't all be color corrected. So I want the overall
> color and brightness from defined materials, e.g. from the plastic
> material, and use the map only for what I would call "local color
> variation". The reason is that I have e.g. red marble, got its color,
> brightness and all that defined as plastic marble. But the marble has
> blue particles which won't appear if I use a grayscale imagemap. So I
> want to use a normpat'ed (NOT colorcorrected e.g. by macbethcal!) to
> bring these blue parts onto the surface. The whole surface however
> must still have the average color of my plastic marble material.
>
> If I understand the man-page of normpat, that's just what it was
> invented for. However, I am a bit unsure, as all Radiance
> documentation uses colorpict with a bright white material.
>
> TIA+CU, Lars.
> --
> Lars O. Grobe
> grobe at gmx.net
>
>
> _______________________________________________
> Radiance-general mailing list
> Radiance-general at radiance-online.org
> http://www.radiance-online.org/mailman/listinfo/radiance-general
>
--
# John E. de Valpine
# president
#
# visarc incorporated
# http://www.visarc.com
#
# channeling technology for superior design and construction
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