#842 no call to background in draw doesn't redraw 3d
#842 no call to background in draw doesn't redraw 3d

baiyanghese/processing-js,corbanbrook/processing-js,jeresig/processing-js,kevinb7/processing-js,annasob/processing-js,jeresig/processing-js,jaredly/processing-js,annasob/processing-js,guazipi/processing-js,kevinb7/processing-js,annasob/processing-js,guazipi/processing-js,corbanbrook/processing-js,baiyanghese/processing-js,corbanbrook/processing-js,jaredly/processing-js