Don't reuse canvas contexts so we can allow switching from 2D to 3D in processing-helper.html
Don't reuse canvas contexts so we can allow switching from 2D to 3D in processing-helper.html

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