update since writing this below, its done it again, and I didnt alter the lines at all. Here is what caused it this time.
I wanted to check their lengths away from the busy difficult to select things area, so copied in place the curves and the dims, then move command and r2000,0 to get them to a clear spot, tried linear dim to get a rough check, then used the curve length dimension again on the lines for a few so I was seeing two of them in effect, happy with the figures, I then deleted that set, scrolled back to my set on the model and the dims there were ####.
Undid the delete and ### became numbers again !
Now stuck with a set I cant delete. So multiple undo to get out of that.
And now another occurrence, I have a line running across 5 stations each 100mm wide at datum, I need to see the distance from st1 to st2, then st1 to st3, st1 to st4 etc
I project a line onto fuselage for st1 to st5. Do the dim in crv command for this st1 to st5 line, and a figure appears.
Clone that line and split command it USING P FOR POINT at St4 so as to measure st1 to st4 on skin, and the st1 to st5 dimension goes ####
Do an experiment, curve dim a line, then copy in place, move it, split using p and get ####
How can I set the figures in concrete just incase it happens again ? (which it did)
In photoshop one can convert to raster the text.
I tried explode but the arrows lose their tip fill and go very thin.
I also needed to have the dimensions showing on the surface, now the fuselage side surface angles outwards as it heads to aircraft front. I was making dims with the arrows pointing fwds so they sat outboard of the surface.
Space decreed I needed to make two head the opposite way and of course the dimension sank within the surface. I exploded it and projected to surface but nothing showed.
I tried moving it on the z axis outboard of the surface but it must have needed many mm as it still sat within and visible when looking at the inside.
It would be useful to be able to create some which are like traditional dimensions, and be able to project to srf.
How can this conversion to ‘raster’ or whatever is needed to be able to stop the number from changing and be able to project to srf be done ?
I then need a command to sit such outside of surface, by an entered distance, to overcome the problem of surface part swallowing features as in other post where BringForward is tricky on a surface that heads in different directions.
Furthermore an auto BringForward associated with dimensions is required, as each and every dimension I plot, be it dim on curve or traditional dimension sinks partially or wholly, and I have double the workload as for each one I create I then have to go BringForward, and I am placing many many dimensions.