Strange and interesting. I can replicate this with Therion 6.4.0 How did you deduce that 0.1 degree inclination change should bypass the problem? Bruce From: Therion <therion-bounces@speleo.sk> On Behalf Of Sau --- via Therion Sent: Saturday, 16 May 2026 04:39 To: therion@speleo.sk Cc: Sau --- <ua9lif@mail.ru> Subject: [Therion] Altitude metapost error -2 Hello I have error, when using command «color map-fg altitude». If i had commented survey in Berloga.th — « v78 v79 4.61 172.9 -41.7» or changed vert angle to -41.8, then all compiling ok. Log of error:
d
! Unknown relation will be considered false. <to be read again> : log->begingroup(if(EXPR2)=0: 0else:mlog((EXPR2))/mlog(10)fi)endgroup <to be read again> ; s_altitudebar->...d:=(EXPR1)-(EXPR0);dlog:=log(d); if.dlog.mod1<0.301:dv:=2;e... l.7428 ...1,(0.00750,0.75000,0.00000,0.00000))("") ; Oh dear. I can't decide if the expression above is positive, negative, or zero. So this comparison test won't be `true'. -- Sau --- Отправлено из Почты Mail <https://trk.mail.ru/c/zzm979>