Direction to Rotation

Direction to Rotation is the bridge from a vector to every Rotation port in Grafit. It reads a direction and returns degrees in the house convention — positive is clockwise — so the number can be cabled straight into any rotation knob without a Remap or a sign flip.

Zero At decides where zero points. Up reads like a compass bearing: (0, 1) is 0°, (1, 0) is 90°. That is exactly what an arrow drawn pointing up needs in order to aim along a direction, which is why the Points Visualize Arrow shape uses the same zero. Right zeroes on +X, the mathematical convention.

The input need not be normalized: Length reports its magnitude, so cabling Distance's Delta into one node yields the aim and the distance at once. Pitch adds the 3D elevation from −90° to 90°, and Radians is the same angle for anything that prefers them.

A zero vector holds the last rotation rather than snapping to 0 — coincident points must not spin the target.

• A field of aimed arrows — Direction per point into Points Visualize's Rotation array, with the Arrow shape: every dart points along whatever you measured.
• Look at the hand — Distance between a tracked hand and an object → Direction → this node → the object's Rotation.
• Velocity as heading — A particle's or a tracked point's velocity vector becomes the rotation of the sprite that rides it.
• A compass — Zero At: Up makes the output read as a bearing, ready for a Value Text caption.
• 3D aiming — Pitch and Rotation together aim a mesh, a light or a camera at a moving target.

• Grafit's rotation is clockwise-positive; that is already handled here, so do not negate the result.
• Use Length instead of adding a second Distance node — one cable from Delta gives both.
• The hold-on-zero behaviour means a target that momentarily coincides with the source will freeze the aim rather than snap it to zero. That is deliberate.
• For the reverse trip — degrees into a unit vector — use Math Expression with sin and cos, remembering the clockwise sign.