Back to Adaptive Vision Studio website

You are here: Start » Filter Reference » Geometry 2D Interpolations » LerpVectors_Radial


Module: FoundationLite

Linearly interpolates between two radial vectors.

Name Type Range Description
inVector0 Vector2D
inVector1 Vector2D
inRotationDirection RotationDirection* Clockwise, counter-clockwise or auto
inLambda Real - - Interpolation between the input vectors where 0.0 value is equal to inVector0 and 1.0 to inVector1
outVector Vector2D


Note that because of inaccuracies of floating-point arithmetic, some geometric operations (including this one) may lead to unpredictable results for degenerated cases. In this filter such a case occurs when a zero vector is given on input.


LerpVectors performed on red inVector0 = (150, 150) and blue inVector1 = (-50, 50) with inLambda = 0,25 and inRotationDirection = Clockwise. Green is the resulting outVector.

LerpVectors performed on red inVector0 = (50, 50) and blue inVector1 = (-25, 25) with inLambda = -1,0 and inRotationDirection = Clockwise. Green is the resulting outVector.


Please note that:
  • interpolation begins at inVector0,
  • for positive inLambda values interpolation is performed in the direction of inVector1 while for negative - in the direction of a vector acquired by mirroring inVector1 by a line determined by inVector0 and its length properly adjusted.
Hence when inLambda = 0,0, outVector is equal to inVector0, while for inLambda = 1,0 it's the same as inVector1 and for inLambda = -1,0 - as the previously described vector. Other inLambda values interpolate between the input vectors and beyond.

Complexity Level

This filter is available on Basic Complexity Level.

Filter Group

This filter is member of LerpVectors filter group.