If I understand you correctly
<hotspot name="polyspot"
keep="false"
visible="true"
enabled="true"
handcursor="true"
capture="true"
style=""
alpha="1.0"
polyline="true"
fillcolor="0xAAAAAA"
fillalpha="0.5"
borderwidth="3.0"
bordercolor="0xAAAAAA"
borderalpha="1.0"
subdiv="true"
onover=""
onhover=""
onout=""
ondown=""
onup=""
onclick=""
onloaded=""
>
<point ath="-30" atv="30" />
<point ath="30" atv="-30" />
</hotspot>
<action name="get_length" autorun="onstart">
getlooktodistance(result, hotspot[polyspot].point[0].ath, hotspot[polyspot].point[0].atv, hotspot[polyspot].point[1].ath, hotspot[polyspot].point[1].atv);
showlog();
trace(result);
</action>Hi Sergey,
My pano is a plain image (as a map). I see that getlooktodistance get the spherical distance in degrees from 0 to 180 degree. I see that ATH and ATV are degrees too.
The polyline in a plain image is as a rute. I need to measure it for later to convert it to meters.
Perhaps I must set a reference maxime distance between two known points to 180 degree and then calculate the value from other angles.
Example:
180 degree it is equivalent to 500 meters, then 90 degree to 250 meters in the plain image.
I will test this idea. The final goal is to measure distances in meters from the values of ath, atv.
Thanks very much for your answer, I wait for your comments. 
Oh, I get you! Experimenting at leisure. This is just trigonometry.
Hi,
measurements would be only possible on a known flat surface.
Most easy on a 2d map, there just linearly get the distances between the polygon points.
Here an older example from a construction documentation - hover the lines with the mouse to see their length:
https://krpano.com/examples/map_line_measurement/
There this is done by calculating the length of the polylines and of one invisible 'scale'-line that has a known length.
Here the xml:
https://krpano.com/viewsource.htm…rement/tour.xml
and here the related actions:
<action name="calclength" scope="localonly">
get_polyline_length('hs_4m_masstab', l_4m);
get_polyline_length(get(caller.name), l_Xm);
calc(caller.linelength_in_m, l_Xm * 4 / l_4m);
roundval(caller.linelength_in_m, 1);
calc(caller.linelength_in_m, caller.linelength_in_m + 'm');
</action>
<action name="get_polyline_length" scope="localonly" args="hsname, retvar">
copy(pnts, global.hotspot[get(hsname)].point);
def(totallength, number, 0);
for(set(i,0), i LT (pnts.count - 1), inc(i),
copy(p1, pnts[get(i)]);
copy(p2, pnts[calc(i+1)]);
calc(dx, p2.ath - p1.ath);
calc(dy, p2.atv - p1.atv);
calc(length, (dx*dx + dy*dy) ^ 0.5 );
add(totallength, length);
);
parentscopeset(get(retvar), get(totallength));
</action>
Best regards,
Klaus
I’ll leave my example, too, it was not in vain that I spent time (mapscale calculated by known length)
https://panosphera.ru/gallery/ruler/
p.s. the accuracy of this method is not very high, because ... for a long time to explain
Thank you very much, it is just what I needed!!!! I am going to study the example for adapting it to a very big image multires for my country 
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