Hello, Klaus
One bug will not let me go to the new version krpano.
In version 1.19-pr4 - 1.19-pr8 can not be used "spheretoscreen" function in the events "over" in "hotspot".
Example
You can generate a droplet tour
Put hotspot
And in "vtourskin.xml" modify the 241 line:
Onover =" tween (scale, 0.55); spheretoscreen (100, 20, tx, ty); "
Now hotspot when the mouse either disappears or shifts 
Hi)
As far as I can see from documentation, using values is not possible inside spheretoscreen. Only variables are supported. Read notes here:
Hi)
As far as I can see from documentation, using values is not possible inside spheretoscreen. Only variables are supported. Read notes here:
This error always occurs
This is more
Krpano does everything correct here, as far as I can see. Rename 'tx' and 'ty' to something else (target_x, target_y). There are new tx, ty and tz settings for moving distorted hotspots in 3D space, read here: https://krpano.com/docu/xml/#hotspot.tx
So your code just translates hotspot's ath/atv into it's 3D offset (that's why, I guess, the spot is shifted to the side).
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