[Radiance-general] DF for a polygon

[Per Haugaard]

Hey Andrew,

Thank you for your help. I actually tried that after posting the message yesterday and it worked well. I got daylight factor equal to zero and a nice picture. 

I am hoping to illustrate DF=0 with a black color instead of purple. Can I change the puple color (DF=0) to black and how can this be done?

Best regards



Per Haugaard,

 Den tirs 26/5/09 skrev Andrew McNeil <andrew.mcneil at arup.com>:

Fra: Andrew McNeil <andrew.mcneil at arup.com>
Emne: Re: [Radiance-general] DF for a polygon
Til: perhaugaard at yahoo.dk, "Radiance general discussion" <radiance-general at radiance-online.org>
Dato: tirsdag 26. maj 2009 17.30



Re: [Radiance-general] DF for a polygon
Yes, your errors are most likely resulting from deleting some of rtrace points.  Rtrace is expecting 4351*3000 points and is getting fewer, hence the unexpected end of file error.



From the rtrace manual page: “If the direction vector is (0,0,0), a bogus record is printed...”   Instead of deleting you could change the vector to ‘0 0 0’ and then the area outside of your polygon would be comprised of bogus records (zeros).   This method might not work if you are expecting legitimate zeros in your output.







On 5/26/09 5:09 AM, "Per Haugaard" <perhaugaard at yahoo.dk> wrote:



Dear users,



I am calculating DF for a polygon. My approach for this is to use cnt, rcalc and rtrace as described below.



cnt 3000 4351 | rcalc -e 'x=157-$1*0.01; y=168.41-$2*0.01; z=0.85; $1=x; $2=y; $3=z; $4=0; $5=0; $6=1' > grids/grid_level_0.xyz



I then deleted the lines outside my polygon and initiated rtrace.



cat grids/grid_level_0.xyz | rtrace -I -ab 4 -aa 0.05 -ar 128 -ad 512 -as 256 -x 4351 -y 3000 -af ambfiles/df.amb -fac octrees/LSE_DF.oct > images/grid2illum_level_0.pic



which results the following error:



rtrace: fatal - unexpected EOF on input

pfilt: truncated input (y=754)

images/grid2illum_level_0_resized.pic: read error

<stdin>: read error (y==139)



Two of the errors occur when I start to work with the grid2illum_level_0..pic image. If I do not specify the picture size in the rtrace command I get the following error:



pfilt: bad picture size

images/grid2illum_level_0_resized.pic: bad picture size

images/grid2illum_level_0_resized_df.pic: bad picture size



Does this error occur because i delete points in the plane and how do I get around this this?





Best regard



Per Haugaard,



 



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