How to parse room dimensions from .rad model ?

radiance-general
1

Crossing over to the general list...

If you can create an octree from your model, try the command and option getinfo -d

That will return the dimensional information for your full scene though, so if there are objects included outside of your area of interest, it becomes more tricky.

···

From: Vaib [mailto:[email protected]]
Sent: Friday, February 07, 2014 12:12 PM
To: radiance-dev
Subject: [Radiance-dev] How to parse room dimensions from .rad model ?

Hello everyone,

It is a kind of weird question but thought to hear your views.

Let's say, someone gave me a .rad file which is a model of a rectangle room. This model has many polygons for surfaces such as walls, windows, luminaire, furniture etc.

How shall I develop a method/function that can parse this .rad file and return me back the room dimensions. I have no additional information, like walls' name variable etc.

I want to make a simple java method for that. I am not using any CAD API.

Is it possible? Please don't bash me for my stupid question.. :stuck_out_tongue:

Best regards,
Vaib

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2

Yes, let's keep this on the general mailing list. The dev list is primarily for development/debugging issues.

The getbbox command will give you a tight box (right rectangular prism) on the entire scene, whereas oconv will report an enclosing cube. However, this won't help you much if your space is non-rectangular or not axis-aligned.

A general tool for extracting the walls from a room is technically the 3-D convex hull problem. There are programs out there to compute this, but I haven't played with them.

Best,
-Greg

···

From: Christopher Rush <[email protected]>
Date: February 7, 2014 9:41:21 AM PST

Crossing over to the general list…

If you can create an octree from your model, try the command and option getinfo –d

That will return the dimensional information for your full scene though, so if there are objects included outside of your area of interest, it becomes more tricky.

From: Vaib [mailto:[email protected]]
Sent: Friday, February 07, 2014 12:12 PM
To: radiance-dev
Subject: [Radiance-dev] How to parse room dimensions from .rad model ?

Hello everyone,

It is a kind of weird question but thought to hear your views.

Let's say, someone gave me a .rad file which is a model of a rectangle room. This model has many polygons for surfaces such as walls, windows, luminaire, furniture etc.

How shall I develop a method/function that can parse this .rad file and return me back the room dimensions. I have no additional information, like walls' name variable etc.

I want to make a simple java method for that. I am not using any CAD API.

Is it possible? Please don't bash me for my stupid question.. :stuck_out_tongue:

Best regards,
Vaib

3

getbbox will solve the issue at hand. Rooms/scenes are mostly right
rectangular prism; and also they are normally kept aligned with principal
axes, only the sky (if with sun) is rotated to change the North. I guess,
to rotate the sky instead of the scene must be preferred for modeling
architectural scenes in Radiance.

Further, just out of curiosity: getinfo -d foo.oct gives [Xmin, Ymin, Zmin,
Size] of the bounding cube (I guess cuboid too?). I couldn't figure what
does Size mean? Is it Xmax or Y/Zmax?

Thank you for your time!

Best regards,
Vaib

···

On 7 February 2014 18:47, Greg Ward <[email protected]> wrote:

Yes, let's keep this on the general mailing list. The dev list is
primarily for development/debugging issues.

The getbbox command will give you a tight box (right rectangular prism) on
the entire scene, whereas oconv will report an enclosing cube. However,
this won't help you much if your space is non-rectangular or not
axis-aligned.

A general tool for extracting the walls from a room is technically the 3-D
convex hull problem. There are programs out there to compute this, but I
haven't played with them.

Best,
-Greg

*From: *Christopher Rush <[email protected]>

*Date: *February 7, 2014 9:41:21 AM PST

  Crossing over to the general list...

If you can create an octree from your model, try the command and option
getinfo -d

That will return the dimensional information for your full scene though,
so if there are objects included outside of your area of interest, it
becomes more tricky.

*From:* Vaib [mailto:[email protected]]
*Sent:* Friday, February 07, 2014 12:12 PM
*To:* radiance-dev
*Subject:* [Radiance-dev] How to parse room dimensions from .rad model ?

Hello everyone,

It is a kind of weird question but thought to hear your views.

Let's say, someone gave me a .rad file which is a model of a rectangle
room. This model has many polygons for surfaces such as walls, windows,
luminaire, furniture etc.

How shall I develop a method/function that can parse this .rad file and
return me back the room dimensions. I have no additional information, like
walls' name variable etc.

I want to make a simple java method for that. I am not using any CAD API.

Is it possible? Please don't bash me for my stupid question.. :stuck_out_tongue:

Best regards,

Vaib

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

4

The size returned by "getinfo -d octree" is the cube side length, which is of course the same in all three dimensions.

-Greg

···

From: Vaib <[email protected]>
Date: February 12, 2014 2:08:22 PM PST

getbbox will solve the issue at hand. Rooms/scenes are mostly right rectangular prism; and also they are normally kept aligned with principal axes, only the sky (if with sun) is rotated to change the North. I guess, to rotate the sky instead of the scene must be preferred for modeling architectural scenes in Radiance.

Further, just out of curiosity: getinfo -d foo.oct gives [Xmin, Ymin, Zmin, Size] of the bounding cube (I guess cuboid too?). I couldn't figure what does Size mean? Is it Xmax or Y/Zmax?

Thank you for your time!

Best regards,
Vaib

On 7 February 2014 18:47, Greg Ward <[email protected]> wrote:
Yes, let's keep this on the general mailing list. The dev list is primarily for development/debugging issues.

The getbbox command will give you a tight box (right rectangular prism) on the entire scene, whereas oconv will report an enclosing cube. However, this won't help you much if your space is non-rectangular or not axis-aligned.

A general tool for extracting the walls from a room is technically the 3-D convex hull problem. There are programs out there to compute this, but I haven't played with them.

Best,
-Greg

5

Thank you Dr.Greg. It makes sense now.

I am just curious to know your opinion on changing the site's North by
rotating the Sky. Do you think it is a good practice? Because on rotating
the building/room, one cannot take full advantage of other good programs
such as getbbox and/or getinfo -d.

···

On 12 February 2014 23:18, Greg Ward <[email protected]> wrote:

The size returned by "getinfo -d octree" is the cube side length, which is
of course the same in all three dimensions.

-Greg

*From: *Vaib <[email protected]>

*Date: *February 12, 2014 2:08:22 PM PST

getbbox will solve the issue at hand. Rooms/scenes are mostly right
rectangular prism; and also they are normally kept aligned with principal
axes, only the sky (if with sun) is rotated to change the North. I guess,
to rotate the sky instead of the scene must be preferred for modeling
architectural scenes in Radiance.

Further, just out of curiosity: getinfo -d foo.oct gives [Xmin, Ymin,
Zmin, Size] of the bounding cube (I guess cuboid too?). I couldn't figure
what does Size mean? Is it Xmax or Y/Zmax?

Thank you for your time!

Best regards,
Vaib

On 7 February 2014 18:47, Greg Ward <[email protected]> wrote:

Yes, let's keep this on the general mailing list. The dev list is
primarily for development/debugging issues.

The getbbox command will give you a tight box (right rectangular prism)
on the entire scene, whereas oconv will report an enclosing cube. However,
this won't help you much if your space is non-rectangular or not
axis-aligned.

A general tool for extracting the walls from a room is technically the
3-D convex hull problem. There are programs out there to compute this, but
I haven't played with them.

Best,
-Greg

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

6

Thank you Rob! :slight_smile:

Vaib

···

On 12 February 2014 23:44, Guglielmetti, Robert < [email protected]> wrote:

Hi Vaib,

Yes, that's generally how folks do it with Radiance, is rotate the sky to
mimic an off-axis building footprint. It's done for the reasons you cite,
as well as for efficiency in the octree. There are a few posts on this on
the archives.

- Googs

From: Vaib <[email protected]<mailto:[email protected]>>
Reply-To: Radiance discussion <[email protected]
<mailto:[email protected]>>
Date: Wednesday, February 12, 2014 at 3:34 PM
To: Radiance discussion <[email protected]<mailto:
[email protected]>>
Subject: Re: [Radiance-general] How to parse room dimensions from .rad
model ?

Thank you Dr.Greg. It makes sense now.

I am just curious to know your opinion on changing the site's North by
rotating the Sky. Do you think it is a good practice? Because on rotating
the building/room, one cannot take full advantage of other good programs
such as getbbox and/or getinfo -d.

On 12 February 2014 23:18, Greg Ward <[email protected]<mailto: > [email protected]>> wrote:
The size returned by "getinfo -d octree" is the cube side length, which is
of course the same in all three dimensions.

-Greg

From: Vaib <[email protected]<mailto:[email protected]>>

Date: February 12, 2014 2:08:22 PM PST

getbbox will solve the issue at hand. Rooms/scenes are mostly right
rectangular prism; and also they are normally kept aligned with principal
axes, only the sky (if with sun) is rotated to change the North. I guess,
to rotate the sky instead of the scene must be preferred for modeling
architectural scenes in Radiance.

Further, just out of curiosity: getinfo -d foo.oct gives [Xmin, Ymin,
Zmin, Size] of the bounding cube (I guess cuboid too?). I couldn't figure
what does Size mean? Is it Xmax or Y/Zmax?

Thank you for your time!

Best regards,
Vaib

On 7 February 2014 18:47, Greg Ward <[email protected]<mailto: > [email protected]>> wrote:
Yes, let's keep this on the general mailing list. The dev list is
primarily for development/debugging issues.

The getbbox command will give you a tight box (right rectangular prism) on
the entire scene, whereas oconv will report an enclosing cube. However,
this won't help you much if your space is non-rectangular or not
axis-aligned.

A general tool for extracting the walls from a room is technically the 3-D
convex hull problem. There are programs out there to compute this, but I
haven't played with them.

Best,
-Greg

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

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