[Bug] improve Shadowmap: bias, acne..

[sasha240100]

New shadows are still unstable. We need to improve shadowmap.
I can't find right value for scope.visible.shadowBias property. Default for solving this problem is 0.05 But in my example it looks not so good.
Some posts, that i found about this problem:

• http://www.fabiensanglard.net/shadowmapping/index.php
• Better lights and shadow maps [ working example attached ] mrdoob/three.js#6420
• Shadowing still gives shadow acne mrdoob/three.js#7359
• Better shadow maps mrdoob/three.js#5554

What i also found is: https://searchcode.com/codesearch/view/9474428/ - this can help me to write shadowmap without modifying threejs object vertices.

[sasha240100]

One more tip/post: http://blog.edankwan.com/post/three-js-advanced-tips-shadow