Unfortunately, that will only find start point of obj VLA-OBJECT, but hey, now I can find intersections of 2 separate splines - there are no int osnap for this :
(vlax-invoke (setq obj1 (vlax-ename->vla-object (car(entsel)))) 'IntersectWith (setq obj2 (vlax-ename->vla-object (car(entsel)))) acExtendNone)
I was wrong, but fortunately - there is int osnap when intersecting 2 splines - only no int when one spline crosses itself...
M.R.
I'll test this method .
Again one modification :
(defun c:test (/ e p pars)
(setq e (car (entsel "\nSelect a curve:"))
p (getpoint "\nSelect Point : ")
)
....
By picking start-end point of spline object Faster's code precision is in range of 1e-8, so having that in mind I suppose it is more trust worth than chlh_jd's with witch precision results are in range of 1e-5 no matter if you change in chlh_jd's code line (rtos a 2 15) - still tolerance is 1e-5 in witch subfunction (ss:spline:getcrossparams en 1e-5) operates...
You're right , Ribarm .
I'll Fix this problem some day later , Today must to sleep .
See the spline codes , AutoCAD has three type of spline : 1) Dual arc Spline (E.G. SPLINSEGS = -8 ); 2) NURBS(Non-Uniform Rational B-spline) 3) B-spline (Command Pedit will create).
'Spline' command will create a NURBS , and can be edited by command 'Splinedit' ; AutoCAD use de-Boor-Cox Recursive way to get Co-tangent arc though assumes that the boundary conditions of the tangent and set weight = 1.0 .
If Node tolerance (DXF Code 42) equal 1e-10 , Control point tolerance (DXF Code 43) equal 1e-10 , then the Fit tolerance (DXF Code 44) will be 1e-5 .
We often see a spline cross at the same point times , if zoom the intersection we found that the curve not really coincide in it , because it just coincide in it by Fit tolerance . It's why we can't get the higher accuracy parameters .
