Sim_physics VoxelData texture

Hi all!

Thanks to the help from Matt Ebb I have implemented a new texture type
for Sim_physics volumetric branch: VoxelData, it do what its name says 🙂
handle voxel datasets, as my previous build do but easier ,so now is
possible to mix volumetrics from several sources: textures,pointdensity
and so as Matt suggest.

I also have adjusted the simulator source to ask user inputs and reduce
the necessity to recompile the code for minor simulation changes.

Here is a tutorial

So, grab the simulator (source) and (windows executable) and hope you
will like this: