Filtering 3d Data

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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