Hello,
We need to add a new feature for checking if an object is under the crosshair.
After adding this feature, you could apply an impulse to that object in case of a shoot.
With this feature, you could also get the 3d x,y,z position from the 2d x,y values of the pointer/crosshair.
We are definitely want to add this feature, and maybe we will release it in the next version with the multiplayer.
B.T.W - The multiplayer is almost ready, and we hope to release an alpha testing version in a week or two.
Regards,
Cyberix3D team