This reverts commit de6d62bf.

first update towards typedarray usage in matrices\n This was done with some simple replaces it doesn't work yet

This is now done as method of Matrix3 object which gets as a parameter Matrix4 object to be inverted (to be consistent with how Matrix4 => Matrix4 inversion is done).

As per discussion in #1615.

Added some vars. The compiler is already optimising this so there is no point on doing this risky pattern anymore.

Matrix4's static methods makeFrustum, makePerspective, makeOrtho are now normal non-static public methods. Fixes #1615.

Renamed Matrix4's setTranslation, setRotationX, setRotationY, setRotationZ, setRotationAxis and setScale to makeTranslation, makeRotationX, makeRotationY, makeRotationZ, makeRotationAxis and makeScale. Fixes #1615.

This adds Vector3.getRotationFromQuaternion and changes Object3D.applyMatrix to use Matrix4.decompose.

Also added SceneUtils.attach / detach and cleaned up unused vector parameter in Geometry.applyMatrix.

As usual, it's up to caller to cache the value if it's not used right away.

Had to use Matrix4's internal matrix to avoid circular cross-dependency between Vector3 and Matrix4 (added extra internal matrix m3 for this not used anywhere in Matrix4 itself to minimize chances of messing up something).

Matrix4.lookAt(): y doesn't need to be normalized because it's a cross product of 2 normalized vectors

"Fixed typos in Matrix4's transpose() and getInverse()"

https://github.com/AddictArts/three.js/commit/62d2560b3c7b9868fc25f628c4022448aaff6b00

Changed console error to return null and updated WebGLRenderer to handle null value. A valid matrix with no rotation and 0 scale will have a 0  determinant and does not need a normal matrix.

Work By: Erik Kitson

Fixed typos in Matrix4's transpose() and getInverse(). Also added convenience functions for adding a translation or rotation to a matrix (rather than just setting them).

Work by: Erik Kitson and Khang Duong

Maybe a bit too early, but just want to see that code clean and simple...

* The new system allow us to add lights and cameras as children of any object without hacks.
* The Camera needs to be added to a Scene. If the Camera has no parent it's added to the Scene being renderer automatically.
* I'll work on implementing this into the WebGLRenderrer tomorrow (gonna be a looong day... ).

This buggy pattern ("something = parameter || nonzero value") exists at more places though elsewhere setting to zero doesn't make that much sense (e.g. in geometries).

Not sure if we should change it everywhere to proper pattern ("something = ( parameter !== undefined ) ? parameter : value").

Maybe it would be good for establishing habit. I remember fixing this buggy pattern long ago but it just keeps popping up.

Still not very fond of decompose returning new array. We will see when it'll be actually used - as API allows for passing in existing translation, rotation, scale, maybe this return array could be eliminated.