cube.js

function emitCube(blf,trb,array,ofs) {
	ofs = ofs || 0;
	var	left = blf[0], right = trb[0],
		bottom = blf[1], top = trb[1],
		front = blf[2], back = trb[2],
		tlb = [left,top,back],
		trf = [right,top,front],
		tlf = [left,top,front],
		brb = [right,bottom,back],
		blb = [left,bottom,back],
		brf = [right,bottom,front],
		emit = function(vec3) {
			array[ofs++] = vec3[0];
			array[ofs++] = vec3[1];
			array[ofs++] = vec3[2];
		},
		quad = function(normal,a,b,c,d) {
			emit(a); emit(normal);    
			emit(b); emit(normal);
			emit(c); emit(normal);
			emit(a); emit(normal);
			emit(c); emit(normal);
			emit(d); emit(normal);
		};
	quad([1,0,0],blb,tlb,tlf,blf); // left
	quad([-1,0,0],brf,trf,trb,brb); // right
	quad([0,0,-1],blf,tlf,trf,brf); // front
	quad([0,0,1],brb,trb,tlb,blb); // back
	quad([0,-1,0],tlb,trb,trf,tlf); // up
	quad([0,1,0],brb,blb,blf,brf); // down
}

function createCube(blf,trb) {
	var array = new Float32Array(createCube.numVertices);
	emitCube(blf,trb,array,0);
	return array;
}
createCube.numVertices = 6*6; // six faces, each two triangles