Scene navigation (first-person style):

• W/S/A/D/R/F: move forwards/backwards/left/right/up/down
• Q/E: turn left/right; hold both to face positive X direction
• T/G: look up/down; hold both to center look at horizon
• O/P: reset position and view to origin/birds-eye
• M: toggle browser full screen mode

Voxel painting:

• Z/X/C: set brush mode to add/delete/(re)color
• 0 through 9: set brush color
• V or Mouse Click: perform brush action
• B: delete most recently added brick

This three.js demo is part of a collection at http://stemkoski.github.io/Three.js/