[Radiance-general] Reflection vs specularity

[Giulio Antonutto]

Iebele,
have you tried with -sj, just to jitter the specular component?

an alternative trick is to generate just an image without specular
component
and another one with it (you may use lower settings for this, may be
just -av something something something -ab 0).
then photoshop will help doing the trick... but I wouldn't define it a
physically accurate technique :-)

ciao
giulio




-----Original Message-----
From: radiance-general-bounces at radiance-online.org
[mailto:radiance-general-bounces at radiance-online.org] On Behalf Of
atelier iebele abel
Sent: 20 July 2005 12:39
To: Radiance general discussion
Subject: [Radiance-general] Reflection vs specularity

Hi,

I have a problem modelling a reflective floor of a large museum hall. 
The specular and roughness components (0.08 and 0.01) in the material of

the floor  result in smooth reflections of the walls, paintings, windows

etc.
The problem arises when adding some lightsources. The lightsources cause

specular reflections with very bright specular spots (highlights) on the

floor. These specular spots do not look realistic (better said: these 
highlights disturb in the image, because there are so many of them).
I have tweaked the specular, roughness and rendering parameters also, 
but I can't  get rid of these specular reflection highlights, apart from

making the roughnes very small or 0. But with low or zero rougness the 
relections of the other geometry become too sharp.
Is there a way to model a reflective material (or lightsource?) without 
a ( or a dimmed) specular reflection highlight ?
Or any other suggestion?

Iebele





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