Assigning value to Abstractmesh._worldMatrix.m does not work with latest versions after babylonjs 2.5

Hi there,

After babylonjs v2.5 the assignment of _worldMatrix.m for an AbstractMesh doens't work.

For instance, myabstractmesh._worldMatrix.m = myMatrixValue. 

Any alternative solution of this assignment with the latest versions of BabylonJs.

Thanks..

mkaouri