[Radiance-general] Creating a void in a wall

[Ehsan M.Vazifeh]

thank you,

finally, I ended up with creating an opening by generating surrounding
surfaces. a bit of more coding lines but simplest way :)

Regards,
Ehsan


On Wed, Jan 29, 2014 at 8:54 PM, Greg Ward <gregoryjward at gmail.com> wrote:

> If you use antimatter, you will need to create a box that cuts through the
> wall to make an opening, creating more geometry than simply making an
> opening in the wall in the first place.
>
> Using mixfunc, you can alternate materials in the wall, but if the wall
> has thickness, you will end up seeing "into" the wall this way, unless you
> also insert some sill geometry.  Again, it ends up being easier to create
> the opening for a thick wall.
>
> Best,
> -Greg
>
> *From: *"Ehsan M.Vazifeh" <em.vazifeh at gmail.com>
>
> *Date: *January 29, 2014 4:42:44 AM PST
>
>
>  Thanks for your early respond Lars.
>
> If I understand correctly to create a window within the wall I need to use
> a mixfunc, because using antimatter will make everything invisible, right?
>
> Cheers, Ehsan
>
>
> On Wed, Jan 29, 2014 at 1:18 PM, Lars O. Grobe <grobe at gmx.net> wrote:
>
>> Hi Ehsan,
>>
>> nothing is impossible with Radiance ;) You can get a hole into your wall
>> without modifying the underlying geometry of the wall polygon. One way is
>> to cut out the opening with a box of material antimatter. Everything within
>> that box will become invisible. This means that you can also not place
>> window frame and glass inside. The second option is to apply a mixfunc
>> modifier to your wall. At locations defined by a simple function, the
>> material will be "air" (e.g. void, or trans with pure specular
>> transmission), everything else will be your wall material.
>>
>> But: you likely introduce later problems when modeling that way. Once
>> that you have overlaps of your invisible, but still existing wall polygon
>> with other geometry (window pane, bsdf or illum, ..) you will get strang
>> results which are hard to debug. I would not recommend this for a simple
>> wall. There are cases where this may make sense, though - e.g. if you want
>> to cut a hole into a sphere, you can either use antimatter or mixfunc into
>> a sphere primitive with few lines of Radiance scene description, or you
>> have to mesh the hole sphere object... possibly leading to a megabyte of
>> triangles...
>>
>> Cheers, Lars.
>>
>> > Dear All,
>> >
>> > Is it possible to create a void in a wall instead of creating polygons
>> around a void?
>> >
>> > For instance:
>> > for creating a window we can generate polygons surrounding the window
>> and then a polygon which refers to glass. now I want to know instead of
>> doing that is it possible to define a wall as a polygon and create a window
>> on the wall without manipulating the wall's polygon.
>> >
>> > It might have a simple solution.
>> >
>> > Best Regards,
>> >
>> > Ehsan
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>
>
>
> --
> E. M. Vazifeh
> Project Assistant
> Department of Building Physics and Building Ecology
> Vienna University of Technology
> Karlsplatz 13, A-1040 Vienna, Austria
> Tel +43 1 58801 27003
> Fax +43 1 58801 27093
> Ehsan.mahmoudzadehvazifeh at tuwien.ac.at
> www.bpi.tuwien.ac.at
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-- 
E. M. Vazifeh
Project Assistant
Department of Building Physics and Building Ecology
Vienna University of Technology
Karlsplatz 13, A-1040 Vienna, Austria
Tel +43 1 58801 27003
Fax +43 1 58801 27093
Ehsan.mahmoudzadehvazifeh at tuwien.ac.at
www.bpi.tuwien.ac.at
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