Query that Resolves to nothing != qNothing()
Jonathan_Hutchinson
Member Posts: 162 PRO
I stumbled on some strange behaviour I couldn't figure out. What I thought was quite a straightforward conditional where I do a qSubtraction, resolved weirdly. As below.
const allGeom = qCreatedBy(id + "extrudeThin", EntityType.FACE);
const planeGeom = qGeometry(qCreatedBy(id + "extrudeThin", EntityType.FACE), GeometryType.PLANE);
const curvedGeom = qSubtraction(allGeom, planeGeom);
debug(context, allGeom, DebugColor.RED);
debug(context, planeGeom, DebugColor.RED);
debug(context, curvedGeom, DebugColor.RED);
if (curvedGeom != qNothing())
{
println("is something");
}
else
{
println("is nothing");
}
Returned in the console:
debug: Query resolves to 6 faces
debug: Query resolves to 6 faces
debug: Query resolves to nothing >>> (curvedGeom variable)
is something >>> (curvedGeom variable, resolves to nothing but isn't equal to qNothing?)
My workaround is to evaluate the query and test if it's equal to an empty array. But I thought equality to qNothing was possible?
Returned in the console:
debug: Query resolves to 6 faces
debug: Query resolves to 6 faces
debug: Query resolves to nothing >>> (curvedGeom variable)
is something >>> (curvedGeom variable, resolves to nothing but isn't equal to qNothing?)
My workaround is to evaluate the query and test if it's equal to an empty array. But I thought equality to qNothing was possible?
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0
Comments
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qNothing is a query structure and is only the same as another qNothing(). An empty query will not resolve to qNothing() it will return [] from evaluateQuery and false with isQueryEmpty. To solve your current code, the fastest ways is
if(isQueryEmpty(curvedGeom)==false)
{
}
so, use isQueryEmpty(curvedGeom)3 -
Ah, thank you! I don't know why I had it in my head that comparing to a qNothing would help me out.0
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Or, even more succinct:
if(!isQueryEmpty(curvedGeom))
{
}Senior Director, Technical Services, EMEA3
