Transparent texture render ok in canvas but not in webgl

What steps will reproduce the problem?
1. create a transparent png, 256 or 16M colours, doesn't matter 
2. create a simple obj + mtl, then use the png as texture
3. load in jsc3d, double-sided for clarity

What is the expected output? What do you see instead?
z-order of the faces is respected, but only in canvas not in webgl

What version of the product are you using? On what operating system?
jsc3d release 1.6.5, win7-64

Please provide any additional information below.
http://italiandesign.brinkster.net/cube_x3_sample.png

Original issue reported on code.google.com by azzolini...@gmail.com on 3 Jun 2015 at 6:19

chetto1983 / jsc3d

Transparent texture render ok in canvas but not in webgl #159