Add animation feature
Add rotation and length option to cylinder
Whole change
Change the method of rotation
Enable player to line and particles
Fix bug
Change particles' material from basic to lambert
Revert the change of materials
change background-color of player
Fix fps to 30
Add wireframe option to space and stage]
fix conflict
Add grid option to stage
Modify the range for z-axis
Add debug objects experimentally
Add example for debug_object
Enable to embed cylinder and debug_object to json object
Add options to DebugObject