A coordinate frame sitting on a curve at a given distance from its start. Z follows the curve direction, X points toward the inside of the bend (a fixed perpendicular on straight stretches), and Y completes the right-handed set.
The curve to place the frame on.
Arc length from the curve's start. Values past either end continue straight along the end segment.
Values the block gives besides its output. The editor lists them under Properties, and an input can read one by reference.
Where the frame's three axes meet.
The affine map from this frame's local coordinates to world coordinates.
The frame's unit X direction.
The plane spanned by X and Y; its normal is the Z axis.
The plane spanned by X and Z; its normal is the Y axis.
The frame's unit Y direction.
The plane spanned by Y and Z; its normal is the X axis.
The frame's unit Z direction.