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..
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.
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.
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.
