FTangentSingleKeyFlattener

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Flattens the tangents of a single key per curve whose tangent mode is user-specified (RCTM_User or RCTM_Break). The degree of flattening is proportional to how close the key moves toward a neighboring key vertically: reaching the neighbor results in fully flat (zero) tangents and passing the neighbor causes it to flip.

=== Algorithm for a center key k ===

AddTangents (call once to initialize):

Find the left and right neighbors of k.

Pick an anchor neighbor: prefer left, fall back to right.

Record initial_distance = |k.Y - anchor.Y|. (No-ops if k has no neighbors, or if k and anchor share the same Y value.)

ComputeMirroringParallel (call each time k moves to recompute tangents):

Compute a blend height; a value that shrinks toward 0 as k approaches either neighbor:

• Moving toward anchor: blend = |k.Y - anchor.Y|
• Moving toward opposite: blend = initial_distance * (1 - |current_distance_to_anchor - initial_distance| / |k_initial.Y - opposite.Y|)

If k has crossed past the target neighbor, flip the tangent direction.

Scale the tangents linearly by blend via RecomputeMirroringParallel.

Syntax

class FTangentSingleKeyFlattener  
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class FTangentSingleKeyFlattener

Constructors

Variables

Protected

Functions

Public

See Also

• FTangentSelectionFlattener For flattening consecutive keys.