# Simplifying Geometry: Current Practice?

What are you-folk doing when you want to to convert a large area of glazing with lots of mullions and muntins into a single "pane" with an applied pattern? Trans modified by a colorpict? Or...?

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Randolph

Hi,

You can try mixfunc and mix transparent material (for glazing) with non
transparent (for frames). If you want to add wall between,then use previous
mixture and mixfunc it with wall material.

For that you'll need some cal file with definition which material should be
'active' for which position on the polygon surface.

Hope this idea helps,
Marija

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On Fri, Sep 17, 2010 at 2:04 AM, Randolph M. Fritz <RFritz@lbl.gov> wrote:

What are you-folk doing when you want to to convert a large area of glazing
with lots of mullions and muntins into a single "pane" with an applied
pattern? Trans modified by a colorpict? Or...?

--
Randolph

Very interesting threat Randolph. I have been recommending to my
students to simply reduce the visible transmittance of the glazing by
20% (assuming a 20% frame to window ratio). That way they can still work
with glass and have a fair chance of getting it right. What do you all
think of this?

Christoph

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Marija Velickovic
Sent: Friday, September 17, 2010 6:25 AM
Subject: Re: [Radiance-general] Simplifying Geometry: Current Practice?

Hi,

You can try mixfunc and mix transparent material (for glazing) with non
transparent (for frames). If you want to add wall between,then use
previous mixture and mixfunc it with wall material.

For that you'll need some cal file with definition which material should
be 'active' for which position on the polygon surface.

Hope this idea helps,
Marija

On Fri, Sep 17, 2010 at 2:04 AM, Randolph M. Fritz <RFritz@lbl.gov> wrote:

What are you-folk doing when you want to to convert a large area of
glazing with lots of mullions and muntins into a single "pane" with an
applied pattern? Trans modified by a colorpict? Or...?

--
Randolph

Keep in mind if you have a thick mullion at close spacing it could start to cut off light at certain angles. In that case the actual geometry will be more accurate than a flattened estimation.

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On Fri, Sep 17, 2010 at 2:04 AM, Randolph M. Fritz <RFritz@lbl.gov<mailto:RFritz@lbl.gov>> wrote:
What are you-folk doing when you want to to convert a large area of glazing with lots of mullions and muntins into a single "pane" with an applied pattern? Trans modified by a colorpict? Or...?

--
Randolph

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Depends on what you want to find in your simulations. The shaded regions may be of interest if you are looking into glare, and may switch a sensor. For an overall annual assumption of daylighting potential you may be fine with the uniform transmission approach. Mark Stock has some nice cal-file to create a facade with uniformly distributed openings, but in general mixfunc is perfect to describe such systems. Of course unless the facade / mullions are not flat but have a thickness to consider (again for e.g. glare).

Cheers, Lars.

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On 17.09.2010 16:55, Reinhart, Christoph wrote:

Very interesting threat Randolph. I have been recommending to my
students to simply reduce the visible transmittance of the glazing by
20% (assuming a 20% frame to window ratio).

Thanks, everyone. I'm still experimenting--I'll let you know how it turns out.

Christoph, I decided not to use reduced transmittance because I wanted shadow patterns. YMMV.

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Randolph