[Radiance-general] Metal Reflection Problem

[Marcus Jacobs]

Dear Group


I have run into an issue with reflections for metal and metal2 materials. In 
my models, I am recieving some noisy reflections. In the following scene, I 
have modeled some kitchen appliances to have a brushed stainless steel 
finish with the following material:

void metal2 brushed_metal_01m1
4	1	1	1	.
0
6 1.0000  1.0000  1.0000  0.75000  0.040 0.075



Here are some renderings of the scene:

http://f1.pg.photos.yahoo.com/ph/marcdevon/vwp?.dir=/RadiancePics&.dnm=room2a_camera1.jpg&.view=t
http://f1.pg.photos.yahoo.com/ph/marcdevon/vwp?.dir=/RadiancePics&.dnm=room2a_camera2.jpg&.view=t
http://f1.pg.photos.yahoo.com/ph/marcdevon/vwp?.dir=/RadiancePics&.dnm=room2a_camera3.jpg&.view=t
http://f1.pg.photos.yahoo.com/ph/marcdevon/vwp?.dir=/RadiancePics&.dnm=room2a_camera4.jpg&.view=t
http://f1.pg.photos.yahoo.com/ph/marcdevon/vwp?.dir=/RadiancePics&.dnm=room2a_camera5.jpg&.view=t


Here are some of the pertinent render parameters:

-ps 1 -sj 1 -st 0 -dt 0

The pictures were rendered at 1000 x 1000 and filtered to 500 x 500.

I know that there should be some blurry reflections on the surfaces on the 
appliances due to the roughness of the material but I question whether or 
not the reflections should look like fractalized noise. They look far more 
fractalized in their native *.pic format that the *.jpg format that you see 
here. The following is a different scene but with the same appliances and 
associated materials as the previous scene. Instead of being illuminated by 
daylight, it is illuminated by some illumination squares. Here you can see 
the reflections are blurry yet smooth except for the reflection of the 
refridgerator handle on the refridgerator door. Here it seems that we have 
the same fractalized noise phenomenon (I can provide a close up of this to 
show more detail).:

http://f1.pg.photos.yahoo.com/ph/marcdevon/vwp?.dir=/RadiancePics&.dnm=room1_default1a.jpg&.view=t
http://f1.pg.photos.yahoo.com/ph/marcdevon/vwp?.dir=/RadiancePics&.dnm=room1_default2a.jpg&.view=t
http://f1.pg.photos.yahoo.com/ph/marcdevon/vwp?.dir=/RadiancePics&.dnm=room1_default3a.jpg&.view=t
http://f1.pg.photos.yahoo.com/ph/marcdevon/vwp?.dir=/RadiancePics&.dnm=room1_default4a.jpg&.view=t
http://f1.pg.photos.yahoo.com/ph/marcdevon/vwp?.dir=/RadiancePics&.dnm=room1_default5a.jpg&.view=t

As a side note, the reflections of the light sources on the floor do not 
seem right. I have noticed this before. Does anyone know what's causing 
this?


I have tried to figure out what's causing all of this but I can't get 
anywhere. I should note that all of the previous scenes were rendered with 
Desktop Radiance binaries. I have tested to see if I got similar results 
using Radiance 3.6 binaries using CYGWIN. I have confirmed this to be the 
case. The folling scene is rendered with Radiance 3.6 binaries for CYGWIN:


http://f1.pg.photos.yahoo.com/ph/marcdevon/vwp?.dir=/RadiancePics&.dnm=house6a_camera6_filt1.jpg&.view=t




Let me know if anyone has problems viewing these photos.





Thanks


Marcus

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