Re: [Openexr-devel] Camera matrices in sxr files

[Peter Hillman]

This came up on the renderman forum last year:
https://renderman.pixar.com/forum/showthread.php?s=&threadid=10209

Florian's suggestion was to use <view>.worldToCamera and 
<view>.worldToNDC as the attribute names, except the Default View (the 
first view listed in the multiView attribute), which remain 
worldToCamera and worldToNDC, so that non-sxr aware software (which only 
loads the default view) would pick up the corresponding 
worldToCamera/worldToNDC
So if you have left-eye as hero eye you'd have worldToCamera for the 
left and right.worldToCamera for the right



Jeff Clifford wrote:
> Hi,
>
> I have a question about how best to store the camera matrices in an 
> sxr file for the left, right (and maybe mono) cameras.
>
> Is the best way to go to simply add some new attributes to the header 
> like:
>
>    header.insert( "worldToCamera_left", Imf::M44fAttribute (Nl_left) );
>    header.insert( "worldToNDC_left", Imf::M44fAttribute (NP_left) );
>
>    header.insert( "worldToCamera_right", Imf::M44fAttribute (Nl_right) );
>    header.insert( "worldToNDC_right", Imf::M44fAttribute (NP_right) );
>
> rather than use the stadard attributes of worldToCamera & worldToNDC?
>
> Or is there some smarter way of having the standard attributes as a 
> vector attributes in some way to allow for multiple camera matrices?
>
> Thanks,
>
> Jeff Clifford.