Hi again, I want to access _currentMeasure property for instance but I can’t call it directly, what should i do?
I am on a phone so heres an untested answer that should probably work.
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Call computeWorldMatrices on the instance and then then try printing the value.
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Try printing the value inside scene.render.
the first is 3d option as I found out and the second one actually works but I can’t realize why 
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Its because the value is not calculated initially, but rather after a couple of frames. Ill look through the docs and let you know if I find a function to force compute it.
Oh, I appreciate it, I just found scene property called executeOnceBeforeRender and can store currentmeasure in a variable there, I can also get current measure in render function but need one extra boolean variable to do this at once only. 
Could not find a function to force compute the values. Your approach seems like the way to go.
Along similar lines, there is also a onBeforeDrawObservable on the rectangle itself. You can perhaps try storing the _currentMeasure value within it if you want rectangle logic to be contained within the rectangle itself.
rectangle.onBeforeDrawObsevable.add(() => {
measure = rectangle._currentMeasure;
});
Though I suppose if that gets called each frame you’ll have to still use a boolean. 
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It works here. Just add a setTimeout of 500 milliseconds and you get the _currentMeasure
haha 
great