How do you get faces cut out by opSplitFace

dave_cowden

Suppose I start with a face, like definition.someFace.  I have found that if I do this:

            opSplitFace(context, splitFaceId, {
                    "faceTargets" : definition.someFace,                
                    "edgeTools": edgeTools,
                    "direction": surfaceTangentPlane.normal
            });
            debug(context, qCreatedBy(splitFaceId, EntityType.FACE) );

qCreatedBy(splitFaceId) does not return any results. 

What I expected to get was the faces that were stamped out by the cutting tool.

Instead, after opSplitFace, I find that definition.someFace now returns all of the faces.  qNthElement(definition.someFace,0) returns indeterministic results.

What I want to get is a reference to the faces that were 'cut out' by the edges. But I cannot find out a good way to do that.

Any suggestions?

ilya_baran

Would taking the edges of definition.someFace before the split, and subtracting the faces edge-adjacent to those edges after the split from the set of all faces do the right thing?  Something like (untested code, beware):

var edges = qUnion(evaluateQuery(context, qEdgeAdjacent(definition.someFace, EntityType.EDGE)));
// Now do the split here
var stampedFaces = qSubtraction(qCreatedBy(splitFaceId, EntityType.FACE), qEdgeAdjacent(edges, EntityType.FACE));

dave_cowden

Thanks thats a good direction I'll try something along those lines. 

I also tried qDependency hoping that the stamped out faces woudl be a dependency of the original edges, but that did not work.

dave_cowden

Oh, wait-- that doesn't work, because qCreatedBy(splitFaceId, EntityType.FACE) does not return any results.... It appears to be one of those operations like opTransform that just modifies the original queries, rather than populating its own results.

ilya_baran

You are right, I think -- then using definition.someFace after the split instead of qCreatedBy(splitFaceId, EntityType.FACE) should work.