Radiance, Ecotect and Daysim

Hi, I'm having a look at the effect of orientation on daylight availability.
I made four identical models in Ecotect, rotated three of them to get N, S,
E, W facing models. I exported to Radiance and brought them into Daysim for
analysis. I was surprised to see identical results for the models. It
appears that Ecotect doesn't take account of the orientation when it exports
the radiance geometry. What it does instead is to rotate the (sunny) sky
description. I guess this is fine for Radiance but Daysim does its own 'sky
thing' and so I guess disregards the exported sky description.

I thought I could rotate the geometry file as required, but I also need to
rotate the sensor grid file. I can use xform on the geometry file to spin
it round the z axis, but it doesn't appear to work on the grid file. I read
a little in the archives about using cnt and rcalc to define new grids - it
might work if I thought about it for long enough. I wonder if there's a
quicker and easier way to transform the grid file. Is there?

Thanks,

Nick

With DAYSIM I believe the sky file is fixed (North = +Y) and therefore to
test different building orientations you need to export from CAD or ?
package new models, this is a little bit inconvenient and at times
dangerous, i.e. if you are changing materials manually once exported as you
could change say three models and not the forth. I am not sure if a change
to the DAYSIM code is possible or if possible is too complex to allow the
sky file to be rotated as it is with Radiance.

Andrew

···

-----Original Message-----
From: [email protected]
[mailto:[email protected]] On Behalf Of Nick
Doylend
Sent: 15 May 2006 17:53
To: 'Radiance general discussion'
Subject: [Radiance-general] Radiance, Ecotect and Daysim

Hi, I'm having a look at the effect of orientation on daylight availability.
I made four identical models in Ecotect, rotated three of them to get N, S,
E, W facing models. I exported to Radiance and brought them into Daysim for
analysis. I was surprised to see identical results for the models. It
appears that Ecotect doesn't take account of the orientation when it exports
the radiance geometry. What it does instead is to rotate the (sunny) sky
description. I guess this is fine for Radiance but Daysim does its own 'sky
thing' and so I guess disregards the exported sky description.

I thought I could rotate the geometry file as required, but I also need to
rotate the sensor grid file. I can use xform on the geometry file to spin
it round the z axis, but it doesn't appear to work on the grid file. I read
a little in the archives about using cnt and rcalc to define new grids - it
might work if I thought about it for long enough. I wonder if there's a
quicker and easier way to transform the grid file. Is there?

Thanks,

Nick

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Dear all,

With the new Ecotect 5.5 (which will hopefully be released very soon)
you can automatically export from Ecotect to Daysim. The export takes
the scene rotation angle into account so that a scene with a North
offset of X degree in Ecotect has the same Offset in Daysim.

Christoph

···

-----Original Message-----
From: [email protected]
[mailto:[email protected]] On Behalf Of
Andrew Bissell
Sent: Monday, May 15, 2006 1:14 PM
To: 'Radiance general discussion'
Subject: RE: [Radiance-general] Radiance, Ecotect and Daysim

With DAYSIM I believe the sky file is fixed (North = +Y) and therefore
to test different building orientations you need to export from CAD or ?
package new models, this is a little bit inconvenient and at times
dangerous, i.e. if you are changing materials manually once exported as
you could change say three models and not the forth. I am not sure if a
change to the DAYSIM code is possible or if possible is too complex to
allow the sky file to be rotated as it is with Radiance.

Andrew

-----Original Message-----
From: [email protected]
[mailto:[email protected]] On Behalf Of Nick
Doylend
Sent: 15 May 2006 17:53
To: 'Radiance general discussion'
Subject: [Radiance-general] Radiance, Ecotect and Daysim

Hi, I'm having a look at the effect of orientation on daylight
availability.
I made four identical models in Ecotect, rotated three of them to get N,
S, E, W facing models. I exported to Radiance and brought them into
Daysim for analysis. I was surprised to see identical results for the
models. It appears that Ecotect doesn't take account of the orientation
when it exports the radiance geometry. What it does instead is to
rotate the (sunny) sky description. I guess this is fine for Radiance
but Daysim does its own 'sky thing' and so I guess disregards the
exported sky description.

I thought I could rotate the geometry file as required, but I also need
to rotate the sensor grid file. I can use xform on the geometry file to
spin it round the z axis, but it doesn't appear to work on the grid
file. I read a little in the archives about using cnt and rcalc to
define new grids - it might work if I thought about it for long enough.
I wonder if there's a quicker and easier way to transform the grid file.
Is there?

Thanks,

Nick

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Radiance-general mailing list
[email protected]
http://www.radiance-online.org/mailman/listinfo/radiance-general

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_______________________________________________
Radiance-general mailing list
[email protected]
http://www.radiance-online.org/mailman/listinfo/radiance-general