dandeery@eircom.net wrote:
> Thanks for your reply.
>
> Please find attached a copy of the file with a mesh created using the rulsurf command
>
Try this.
I used RULESURF to create a mesh, exploded the mesh into its component
3dfaces, then used F2S.lsp to convert the faces into a solid with a flat
bottom 10 units below the lowest face vertex. If the final solid needs
to have a constant thickness rather than a flat bottom, copy the solid
down by the desired thickness, then subtract the copy from the original.
This was done in ACA 2010, and saved in 2007 format.
I was unable to open your file in ACA 2008 -- "created with a more
recent version of AutoCAD." ACA 2010 flagged it as not created by an
AutoDesk product, but let me open it. Are you using software from
another vendor that might not be completely compatible with AutoCAD or LISP?
For the record, when I converted your mesh to a surface and then tried
to THICKEN the surface, AutoCAD 2010 balked, unable to thicken because
"surface intersects itself", which as far as I could tell it does not. I
tried this with several lower values of SURFTAB1, to no avail. However,
I was able to use THICKEN on a new surface created by RULESURF from new
shorter 3dpolylines, so perhaps one of your 3dpolylines doubles back on
itself somewhere -- I did not check it vertex by vertex.