[Radiance-general] DF for a polygon

[Andrew McNeil]

Hi Greg,

A falsecolor scale that colors zero as black is actually very useful.  I
often use pcompos and image masks to achieve the same effect.  A second
version of falsecolor modified as you suggested is a major convenience for
me.  Thanks!

If others agree that it is useful, maybe it can be incorporated in
falsecolor as an alternate color scale (similar to the -spec option)?

Thanks,
Andy



On 5/27/09 8:37 AM, "Greg Ward" <gward at lmi.net> wrote:

> Hi Per,
> 
> It's a bit non-standard, but you make a duplicate copy of the
> falsecolor script and customize the new one by altering some lines in
> there relating to the color scale.  Change the line:
> 
> def_redp(i):select(i,0.18848,0.05468174,
> to:
> def_redp(i):select(i,0,0.05468174,
> 
> Similarly, change:
> 
> def_grnp(i):select(i,0.0009766,2.35501e-05,
> to:
> def_grnp(i):select(i,0,2.35501e-05,
> 
> and:
> 
> def_blup(i):select(i,0.2666,0.3638662,0.4770437,
> to:
> def_blup(i):select(i,0,0.3638662,0.4770437,
> 
> I'm thinking this should make the darkest values come out black.
> 
> Best,
> -Greg
> 
>> From: Per Haugaard <perhaugaard at yahoo.dk>
>> Date: May 27, 2009 12:23:07 AM PDT
>> 
>> 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,
> 
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