Touch Control

based on tool of https://github.com/Quatrefoil-GL/touch-control , which is designed for touch screens.

Shortcuts for viewport movememnt

Keyword shortcuts for viewport moving:

• w move forward
• s move backward
• a move left
• d move left
• "Up" move up
• "Down" move down
• "Shift Up" rotate to view up
• "Shift Down" rotate to view down
• "Left" rotate to view left
• "Right" rotate to view right