Fwd: Re: [Radiance-general] two sided surface

[jedev@visarc.com]

Hi All,

I meant for this to go to the group...

-Jack

Sent from my Verizon Wireless Phone

----- Forwarded message -----
From: "jedev at visarc.com" <jedev at visarc.com>
Date: Wed, Apr 21, 2010 4:13 PM
Subject: Re: [Radiance-general] two sided surface
To: "Nick Hubof" <nhubof at gmail.com>

Hi,

The following assumes geometry with uniform normal orientation.

void plastic concave
0
0
5 .5 .5 .5 0 0

void metal convex
0
0
5 .8 .8 .8 .8 0

void mixfunc blind
4 concave convex if(Rdot,1,0) .
0
0

Then apply the blind material to your geometry. You will need to correctly define the convex and concave materials for your needs. You will also need to check that's the materials are showing up on the correct sides. One way to do this is to first define the convex and concave materials as red and blue for an easy visual check. If you need to reverse the materials then simply swap the names in the blind material definition.

Hope this helps.

-Jack de Valpine

Sent from my Verizon Wireless Phone

----- Reply message -----
From: "Nick Hubof" <nhubof at gmail.com>
Date: Wed, Apr 21, 2010 12:23 PM
Subject: [Radiance-general] two sided surface
To: <radiance-general at radiance-online.org>

I am modeling a large amount of physical blinds in an office scene. I am
replicating a Warema blind that has an opaque surface (grey) on the convex
side and a chrome surface (93% reflective) on the concave side. To minimize
the amount of geometry I was hoping there is an easy way to apply two
materials to the curved plane instead of adding a thickness and more than
double the geometry.

I have searched the knowledge database and could not find what I was looking
for. I hope there is an easy way to do this. 

For instance the surface normal is the chrome material and the opposite side
is the opaque material.

Thank you in advance.

Nick

 

 

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