4D Explorer
Drag: orbit camera · Shift+drag: rotate XW/YW · Ctrl+drag: XY/ZW
Hold Q/A W/S E/D: rotate XW / YW / ZW · [ ]: move slice plane
Space: pause · . : step frame · R: reset rotation · Ctrl+Z / Ctrl+Y: undo/redo
Axes: X Y Z W — the slice view shows the true 3D cross-section at w = w₀.