is there a way to either trim splines against each other, or insert vertices at intersection? or even snap to this intersection? I know I have intersections but neither trim nor a snap plugin I downloaded seems to be working - this is such an elementary thing but I can’t figure it out..

help?!

Please - put your Max version (and brief system specs) in your sig. In these non version-specific forums we need to know which version you’re using.

is there a way to either trim splines against each other

The Trim function does work. Both splines must be part of the same Editable Spline object.

Assuming a cross (2 splines crossing at right-angles), Spline sub-object mode and Click Trim, click the spline you want to trim, it will be trimmed to the closest spline which intersects the one you clicked.

or insert vertices at intersection

Cross Insert.
Vertex SO mode, click Cross Insert - the cursor will change when it is over an intersection. Click at that point and you will get 2 vertices, one on each spline.

or even snap to this intersection

Not that I know of. You can get close to it by using Edge snaps, but that isn’t perfect.

Max 4.2 through 2014, Composite 2014.
XP-64 (SP2).
nVidia 9800GTX+ (512MB) (Driver 314.22).
i5-3570K @ 4.4GHz, 8Gb Ram, DX9.0c.

I will relate some of my experience using CrossInsert, and Trim/Extend in Max.  They don’t always work as wanted or expected.  I’ve had the most difficulty with CrossInsert, either the inserted vertex shoots off screen or the intersection is not recognized.  I don’t think it likes long segments or Bezier curved vertices with long handles.

Trim will sometimes remove a much larger portion of a spline, especially when your spline object is rather complex.  I’ve found that the order that you trim an area can also affect how well it trims the splines.  Sometimes adding in vertices around the area will help, especially in a curve.

3ds Max Design 2012 64-bit - Subscription Advantage Pack / PU10
Dell Precision T5500, Dual Six Core Xeon X5650 @ 2.67GHz, nVidia Quadro 5000, 24 GB RAM, Win 7 Enterprise 64-bit
Minneapolis, MN, USA

thanks for the comments. I will ammend my profile to help with the forum posts. Here’s something that would also be useful - I can’t see an option for email notification for foum responses to posts being made. Usually that’s an option on these kinds of forums…

Based on everyone’s comments, I’m guessing the splines weren’t crossing, or at least Max for whatever can’t recongnize that they are. Seems strange that you wouldn’t be able to snap to an intersection if you can trim to one or even insert a vertices at one.

I had the same problem. I was looking for a script, but found it unseccesfull.
The way i resolved it, was by copyng the geometry away, and trough boolean operation > union intersected them. Then, i could snap to that points.
Hope it helps!

ANOTATTION: CALCAR in spanish = Trace. Just find out.

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Chris Medeck, such an old post and still it helped in max 2012!

Thankyou :)