How do I change existing materials values? Fe. Glow, in script side. Im pretty confused with this and I couldnt find any help for this, really. :-\

You should create a helper material in constant memory address (if you don't want to modify global material)

Material marterial;

once at loading time:

material=*Materials("ready material.mtrl");
material.glow=1.0f;
mesh.setMaterial(material);

then during updating:
material.glow=xxx

Thank yous!