topic Re: Trim / Extend & 3D Custom Object - never calls my subIntersectWith() in ObjectARX Forum

Trim / Extend & 3D Custom Object - never calls my subIntersectWith()

Anonymous — Mon, 01 Sep 2014 14:09:48 GMT

I'm trying to support trim / extend on a custom object that represents a 3D entity (either a single 3D solid, but not derived fro AcDb[3d]Solid, or a collection of solids stick together, but which still constitute a 3D entity with length, width and depth).

I have implemented subIntersectWith() on both the custom objects so that no matter whether you try to select one or the other, they behave the same in terms of collecting intersection points.

I am looking to support trim / extend either by a standard AutoCAD line entity, or by another one of these 3D entities. For now, I'm testing with a line.

The problem is, whenever I try to trim my entity to this line, it never calls subIntersectWith() on any of my custom objects - the command line always says

Object does not intersect an edge.

I deliberately ensured that the line I was trying to use to trim was at the exact Z value that would be the line my entity uses, but since it never calls my code that is moot at the moment. The line quite definitely runs smack through the solid, so there's no way they don't intersect. I also tried moving the line up to the top face of the solid (where it would render its grip points), but no difference.

Any idea what I'm missing? I'm not being given chance to list intersecton points, basically. What is the criteria for it to call into our code? It's almost as if it's calling the line's subIntersectWith() with our object - which it probably wouldn't understand, although we *are* derived from AcDbCurve - but never the other way around.

I did try once using one of my own entities to trim the other - they are both of the same depth and elevation - and it just did the same. So *neither* got called.

Re: Trim / Extend & 3D Custom Object - never calls my subIntersectWith()

owenwengerd — Mon, 01 Sep 2014 14:24:21 GMT

There are two AcDbEntity::subIntersectWith() functions with different signatures. Did you override both?

Re: Trim / Extend & 3D Custom Object - never calls my subIntersectWith()

Anonymous — Mon, 01 Sep 2014 14:43:17 GMT

I did not, admittedly. Since I couldn't see anything that suggested I needed to, I assumed they were alternatives. I'll try implementing the other version when I get a chance.

Re: Trim / Extend & 3D Custom Object - never calls my subIntersectWith()

Anonymous — Mon, 01 Sep 2014 15:04:24 GMT

No change, I'm afraid.

Re: Trim / Extend & 3D Custom Object - never calls my subIntersectWith()

owenwengerd — Mon, 01 Sep 2014 16:21:12 GMT

I recommend to create a new minimal project that demonstrates the problem and post it here to see if someone can spot the problem.

Re: Trim / Extend & 3D Custom Object - never calls my subIntersectWith()

Anonymous — Tue, 02 Sep 2014 06:55:29 GMT

I will try that when I have enough time. Knowing my luck the minimal project will work! 🙂