Hi,
I am completely stuck with my attempt to get some rather generic diffusor into my scene. I have a room which is lid by a light pipe, and to simulate this I use radiance 3.7 with the pmap extension. Everything works rather fine. Now I wanted to put some diffusing body under that light pipe, and I chosed the trans material to do so. The material definition I used should result in a simple diffuse transmitting box:
void trans genericDiffusor
0
7 1 1 1 0 0 .5 0
And I applied this to a box:
!genbox genericDiffusor Diffusor60x60 .3 .3 .01 | xform -t -.3 -.3 0
The opening is .6x.6m and centred at the origin, so that my diffusor covers only part of it. I want to see the effect of the material... And the effect is - somewhat unexpected. The "diffusor"-box appears black in my rendering. So is there anything completely wrong in my scene? Is there anything I got wrong about trans and surface normals, is it the combination of trans and pmap?
CU Lars.
I have used this before for a lightpipe diffuser using PMAP, the figures
were just best guess coupled to a visual trial and error process.
void trans transdisc
0
0
7 0.8 0.8 0.8 0 0.01 0.8 0.8
transdisc ring transdisc1
0
0
8
0 0 3000
0 0 -1
0 266.5
I hope that is of some help.
Andrew
···
__________________________
Andrew Bissell
B.Eng(Hons) C.Eng MSLL MCIBSE MIET
Associate Lighting Designer
Cundall Light4
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-----Original Message-----
From: [email protected]
[mailto:[email protected]] On Behalf Of Lars
O. Grobe
Sent: 04 February 2009 10:51
To: Radiance general discussion
Subject: [Radiance-general] trans, pmap and head-ache...
Hi,
I am completely stuck with my attempt to get some rather generic
diffusor into my scene. I have a room which is lid by a light pipe, and
to simulate this I use radiance 3.7 with the pmap extension. Everything
works rather fine. Now I wanted to put some diffusing body under that
light pipe, and I chosed the trans material to do so. The material
definition I used should result in a simple diffuse transmitting box:
void trans genericDiffusor
0
0
7 1 1 1 0 0 .5 0
And I applied this to a box:
!genbox genericDiffusor Diffusor60x60 .3 .3 .01 | xform -t -.3 -.3 0
The opening is .6x.6m and centred at the origin, so that my diffusor
covers only part of it. I want to see the effect of the material... And
the effect is - somewhat unexpected. The "diffusor"-box appears black in
my rendering. So is there anything completely wrong in my scene? Is
there anything I got wrong about trans and surface normals, is it the
combination of trans and pmap?
CU Lars.
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http://www.radiance-online.org/mailman/listinfo/radiance-general
Hi Andrew,
thank you for the example, but this also appears black in my scene.
Lars.
Bissell, Andrew wrote:
···
I have used this before for a lightpipe diffuser using PMAP, the figures
were just best guess coupled to a visual trial and error process.
void trans transdisc
0
7 0.8 0.8 0.8 0 0.01 0.8 0.8
Sorry... this was complete nonsense, I had the modifier overwritten by one of my xform-transformations, so it never was trans!
Please forger my posting, sorry for this, just found it.
Lars.