javascript - 2D sprite using webgl and Famo.us -

i'm trying render 2d sprite sheet webgl mesh.

currently have setup this:

var char = game.addchild(); char.setsizemode('absolute', 'absolute')     .setabsolutesize(x, y)     .setposition(0,0,0)     .setalign(0,1);  var charmesh = new mesh(char); var plane = new plane(); charmesh.setgeometry(plane);  var image = material.texture('./assets/sprite.png'); charmesh.setbasecolor(image); 

and happens webgl object entire sprite sheet background. need way grab piece of sheet, preferably coordinates. can swap out coordinates grab next frame inside sprite sheet. believe should possible in manner, , reading through webgl/opengl documents, it's not clear how translates famo.us. can out?