same atv ath value，hotspot has shifted

I used to dynamically create hotspot,use KRPANO drag hotspot examples code to save hotspot atv and atv value,using the same ath atv value create hotspot,hotspot has big sheifted.

Thanks for the help.

/*
Get hotspot ath, atv value
*/

<hotspot name="dragmessage" keep="true" devices="html5" width="168" height="32"
url="%SWFPATH%/plugins/message.js?v2" renderer="css3d" border="false" backgroundalpha="0" bgalpha="0" ondown="draghotspot();"
ath="0.0" atv="0.0" visible="false" zoom="false" mode="drag" distorted="false" edge="leftbottom"
/>

<action name="draghotspot">
spheretoscreen(ath, atv, hotspotcenterx, hotspotcentery, 'l');
sub(drag_adjustx, mouse.stagex, hotspotcenterx);
sub(drag_adjusty, mouse.stagey, hotspotcentery);
asyncloop(pressed,
sub(dx, mouse.stagex, drag_adjustx);
sub(dy, mouse.stagey, drag_adjusty);
screentosphere(dx, dy, ath, atv);
set_hotspot_pos();
);
</action>

<action name="set_hotspot_pos"><![CDATA[
copy(print_ath, ath);
copy(print_atv, atv);
roundval(print_ath, 3);
roundval(print_atv, 3);
copy(layer[dragdb].ath,print_ath);
copy(layer[dragdb].atv,print_atv);
]]>
</action>

/*
dynamically create a hotspot
*/
<action name="addmessage">
addhotspot(%1);
set(hotspot[%1].name,%1);
set(hotspot[%1].keep,"false");
set(hotspot[%1].devices,"html5");
set(hotspot[%1].width,"128");
set(hotspot[%1].height,"32");
set(hotspot[%1].url,"%SWFPATH%/plugins/lemessage.js?v1");
set(hotspot[%1].renderer,"css3d");
set(hotspot[%1].border,"false");
set(hotspot[%1].backgroundalpha,"0");
set(hotspot[%1].bgalpha,"0");
set(hotspot[%1].ath,%2);
set(hotspot[%1].atv,%3);
set(hotspot[%1].visible,"true");
set(hotspot[%1].zoom,"false");
set(hotspot[%1].edge,"leftbottom");
set(hotspot[%1].distorted,"false");

</action>

use the draghotspot function get atv,ath value;
use the addmessage function dynamically create a hotspot, but after adding, the hotspot position has a big shift, how is this going on.

when rotating up and down after the zoom view, hotspot location will be shifted,where I do wrong, how to fixed hotspot?
thanks for your help.

Different FOV, drag the hotspot get the same position ath atv values are not the same, dynamically added depth hotspot are not the same, I ask how to calculate depth hotspot, thank you for your help.