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

##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] )