HI Everyone, I have tried again but now at full cave level it doesn't work, it does however work at small scales such as individual th2/thconfig. So the scaling up to full cave survey is causing the issue, probably as well as some of the code. Can anyone assist. The below code for thconfig currently is: layout local code metapost def l_u_wall (expr P)= T:=identity; if known(ATTR_color): pickup PenA; draw P withpen PenA withcolor scantokens(ATTR_color); fi; enddef; initsymbol("l_u_wall"); endcode endlayout #### I have been pointed to chapter 27 of this link by the config window, I will need to do some looking into this. Tex.org.uk/systems/knuth/dist/mf/mfbook.tex<https://tex.org.uk/systems/knuth/dist/mf/mfbook.tex> ##error message##
___________pickup ! Isolated expression. <to be read again> pencircle PenA->pencircle .scaled(u/10) l_u_wall->...wn(ATTR_color):___________pickup.PenA ;____________draw(EXPR0)wi... l.10992 )) ; I couldn't find an `=' or `:=' after the expression that is shown above this error message, so I guess I'll just ignore it and carry on.
! Extra tokens will be flushed. <to be read again> pencircle PenA->pencircle .scaled(u/10) l_u_wall->...wn(ATTR_color):___________pickup.PenA ;____________draw(EXPR0)wi... l.10992 )) ; I've just read as much of that statement as I could fathom, so a semicolon should have been next. It's very puzzling... but I'll try to get myself back together, by ignoring everything up to the next `;'. Please insert a semicolon now in front of anything that you don't want me to delete. (See Chapter 27 of The METAFONTbook for an example.)
____________draw ! Isolated expression. <to be read again> (path) l_u_wall->...__pickup.PenA;____________draw(EXPR0) withpen.PenA.withcolor.sca... l.10992 )) ; I couldn't find an `=' or `:=' after the expression that is shown above this error message, so I guess I'll just ignore it and carry on.
! Extra tokens will be flushed. <to be read again> (path) l_u_wall->...__pickup.PenA;____________draw(EXPR0) withpen.PenA.withcolor.sca... l.10992 )) ; I've just read as much of that statement as I could fathom, so a semicolon should have been next. It's very puzzling... but I'll try to get myself back together, by ignoring everything up to the next `;'. Please insert a semicolon now in front of anything that you don't want me to delete. (See Chapter 27 of The METAFONTbook for an example.)
_____fi ! Isolated expression. <to be read again> ; l.10992 )) ; I couldn't find an `=' or `:=' after the expression that is shown above this error message, so I guess I'll just ignore it and carry on.
[31] [32] (./mptextmp.mp) [33] ) (end occurred when if on line 10992 was incomplete) Regards, Alastair Gott. AlastairGott@hotmail.com, M: 07931779380. ________________________________ From: Therion <therion-bounces@speleo.sk> on behalf of alastair gott <alastairgott@hotmail.com> Sent: 01 March 2026 13:26 To: Therion Mailing List <therion@speleo.sk> Subject: [Therion] Colored Lines Based On Attributes HI Everyone, Follow up on this thread from 17 years ago. https://mailman.speleo.sk/pipermail/therion/2009-September/002633.html We have tweaked the code, with Andrews help. To make it work In th2/Lines: Type u:wall Options: -clip off -attr color "(0, 0.5, 0)" Or -clip off -attr color green In thconfig: layout local code metapost def l_u_wall (expr P)= T:=identity; if known(ATTR_color): pickup PenA; draw P withpen PenA withcolor scantokens(ATTR_color); fi; Enddef; initsymbol("l_u_wall"); endcode endlayout