Filtering 3d Data

["f f" <gray_java@xxxxxxxxxxx>]

hi, i'm attempting to set up my app so that there are sliders to set 
upper/lower limits on the values to be displayed in a 3d render. eg, for 
each x,y,z there is some w and i want to set a lower and upper limit on the 
w's that will be shown. so the data has to be filtered somehow... i think 
this would probably be easiest using a Grid3d of some kind but I don't know 
how.



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