[Radiance-general] Insert text in Radiance images at specific location (x y z)

[Vaib]

Thank you Dr.Greg. I also suspected that since Pcompos deals with images
(and not Radiance objects) therefore it will only take pixel
coordinates (and not world coordinates) as input arguments. Your idea of
recording pixel coordinates through ('t' or middle mouse button) will
absolutely work but ideally I was looking for a fully automated process.

Still I think there could be one solution, if I write an algorithm to
convert the (x,y) world coordinates of the sensors into (x,y) pixel
coordinates by taking into account the actual room size and pixel counts of
the image. If I give -vv and -vh options equal to the room size in parallel
camera, and the resolution of the image produced is known than I think
somehow this can be done. This is just a thought process yet. I hope this
could happen. I will be glad to know your views on it. Excuse me if I
confused. Thank you again!

Best regards,
Vaib


-
Vaibhav Jain
www.vaibhavjain.co


On 11 December 2013 06:44, Greg Ward <gregoryjward at gmail.com> wrote:

> Hi Vaibhav,
>
> This is probably in the archives, somewhere, but I wouldn't want the task
> of trying to find it myself, so I won't insist you look, either.
>
> If you have a list of (x,y) pixel coordinates (where x is horizontal
> position from the left and y is vertical position from the bottom), you can
> use vwrays to generate rays and compute illuminance values to composite
> into your image.  You can generate such a list using the 't' command in
> ximage:
>
>         ximage -tp myrendering.hdr > positions.txt
>
> Just move the cursor over each place you want to compute illuminance and
> type 't'.  Don't expect a beep or anything, and don't hold down the 't' or
> you'll get a whole list of identical values when it repeats.  (If you
> prefer, you can click the middle mouse button instead of typing 't'.)
>
> The list of positions can then be used in the following manner to generate
> illuminance values and output them via psign and pcompos:
>
>         $ echo pcompos myrendering.hdr 0 0 \\ > pcom.sh
>         $ vwrays -i myrendering.hdr < positions.txt \
>                 | rtrace -h [rendering options] -i+ myscene.oct \
>                 | rlam positions.txt - \
>                 | rcalc -e 'lux=47*$3+120*$4+12*$5' -o '=00 "!psign -h 25
> -s -.1 ${lux}" ${$1} ${$2} \' >> pcom.sh
>         $ sh pcom.sh > myluxvalues.hdr
>         $ rm pcom.sh
>
> If the text is too large or too small, adjust the psign -h value downwards
> or upwards as desired.
>
> I haven't fully tested this, so I hope I didn't make any goofs.  Of
> course, it assumes you are using Unix.  Otherwise, you'll have more
> difficulty getting the quotes to work properly since Windows only allows
> double-quotes....
>
> Best,
> -Greg
>
> > From: Vaib <vaibhavjain.co at gmail.com>
> > Date: December 10, 2013 5:06:35 PM PST
> >
> > Hello everyone,
> >
> > I wish to show illuminance values at specific locations at world
> coordinates (x y z) in an image. I mean, to show the illuminance values (in
> an orthographic image of a plan created by a camera with parallel lens) at
> the real position of the illuminance sensors (Rtrace/Rsensor).
> >
> > The only way I could find is to use Psign to produce text's image, and
> then position the produced text in the plan image by using Pcompos.
> Something like this: psign 100 Lux | pcompos inp.hdr 0 0 +t .5 - 200 200 >
> out.hdr. However, Pcompos takes input of the location of a pixel and places
> the text there. This is not what I intend to achieve.
> >
> > Are there other ways to do this? Thank you in anticipation.
> >
> > Best regards,
> > Vaibhav Jain
> > www.vaibhavjain.co
>
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