[Radiance-general] two sided surface

[Thomas Bleicher]

Nick.

In Radiance geometry and material definition go hand in hand. You
could try evaluating the surface normal to chose the correct material
in a custom expression but that would increase your render time
significantly.

As an alternative you could use the same geometry with a small
z-offset. If you have all the blinds in a separate *.rad file use the
-m option of xform to give them a new modifier:

!xform -m grey_mat blinds.rad
!xform -m chrome -t 0 0 -0.001 blinds.rad

That will offset the blinds by 0.001 units down and use the material
'chrome' for this 'side'.

Regards,
Thomas

On Wed, Apr 21, 2010 at 5:16 PM, Nick Hubof <nhubof at gmail.com> wrote:
> 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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