Voxel field visualisation with  headtracking navigaion by VFX3D

Autor: Michal Husak husakm@vscht.cz
Based on NeHe leson 10 tutorial

It use MIDI for data sonification 
- proucd Giger-Muler like counter sound 
indciating the field density in the cross position

Contorols

General:

m - set mark in the scpace
s - launch a sphere shot
o - OSD information visible

Keyboard mode:
Arows - roatation and movement
PageUp/Down - look up/down
+ - - change the isosurface level
1,2 - change the speed of movement
3 restore speed to initial

Cyberpuck/VFX3D mode:
button1/2 forward/back
button3 - launch sphere

Joypad/VFX3Dmode:
joy Y - axis forward/back
button1- OSD onn/off
button2- launch sphere
button3- set mark
button4- restore default insodensity level
joy X - change the isosurface level
