Alex, you have right! but "If you don't have what you like, you have to like what you have! " ***[Catharina Harders..The Real Life].. lol

dvlenk6
***and back to the track, no I don't think you are on a wrong place here, poser use the same way of HDR as other programs, with only one thing that the HDR IBL Light in poser don't need the spherical environment, the light with the HDRI do that all, and for the spherical environment and reflections we use the spherical mapping shader node so everything the same but without the BALL ( DOM)  however I made already a products with 360 degree for panoramic rendering using a DOM for the sky maps...
They should do that in Poser and allow the users to load the spherical Angular HDR maps also as360 degree  backgrounds that would be much more fun ... as we have in Vue
the link you provided is great, very cool previews of the panoramic renders

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