[Radiance-general] Errors with Vertically Tall HDR Images

[Jan Wienold]

hi alstan,
I saw  you are using a pretty old version of radiance - do you experience this also with a more recent version?
best
jan

On 16 August 2018 04:33:10 CEST, "J. Alstan Jakubiec" <alstan at jakubiec.net> wrote:
>Dear Radiance friends,
>
>(Sorry to post to the mailing list, but the Discourse server seems to
>be 
>down.)
>
>I have an issue when I am working with some rather tall HDR images 
>(10,000 - 100,000 pixels tall). The application is that I am running 
>annual discomfort calculations using Jan's gen_dgp_profile approach
>with 
>many views on very large octrees. In this case, one call to rtrace with
>
>a big vwrays output file is better than 40+ to rpict where the octree 
>needs to be loaded into memory each time. I tested this in a model with
>
>38 views and a 500 x 500 pixel output per view, resulting in a 500 x 
>19,000 pixel image per timestep, which worked great! Now I am working 
>with a model that has 56 views (a 500 x 28,000 pixel image), and I get 
>systematic errors when passing the output to evalglare.
>
>Here are the steps I am using:
>
>  * I run vwrays 56 (or n) times: vwrays -ff -vta -vv 180 -vh 180 -vp
>    ... -vd ... -x 500 -y 500 >> views.rays
>  * rtrace -x 500 -y 28000 -ab 0 -lw 0.0000001 -st 0.15 -ffc !oconv ...
>    < views.rays > image.hdr
> * I cut the output using pcompos, and pass it to evalglare: pcompos -x
>    500 -y 500 image.hdr 0 *pixel_offset* | evalglare.exe -vta -vv 180
>    -vh 180 ...
>      o In this case pixel_offset is 0 for the last view, -500 for the
>        second-to-last, etc.
>
>I can extract images for every offset -500 through -27500 except for
>the 
>0 offset. I get this error for the 0 offset (passing to ra_bmp in this 
>case):
>
>    image.hdr: read error (y==499)
>    ra_bmp: error reading Radiance picture
>
>I am not sure quite what to make of this and hope that someone here 
>might have an idea. I uploaded an example image here: 
>https://www.dropbox.com/s/7gub8i4row9qmsz/image.hdr?dl=0 Is the error 
>with the render itself or with the size of the HDR?
>
>Thank you,
>
>Alstan

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