[Radiance-general] How to parse room dimensions from .rad model ?

[Guglielmetti, Robert]

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 <vaibhavjain.co at gmail.com<mailto:vaibhavjain.co at gmail.com>>
Reply-To: Radiance discussion <radiance-general at radiance-online.org<mailto:radiance-general at radiance-online.org>>
Date: Wednesday, February 12, 2014 at 3:34 PM
To: Radiance discussion <radiance-general at radiance-online.org<mailto:radiance-general at radiance-online.org>>
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 <gregoryjward at gmail.com<mailto:gregoryjward at gmail.com>> 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 <vaibhavjain.co at gmail.com<mailto:vaibhavjain.co at gmail.com>>

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 <gregoryjward at gmail.com<mailto:gregoryjward at gmail.com>> 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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