Add angular difference wrt reference direction to movement or eye tracker data frame

Source: R/add_movement_functions.R

Takes a movement or eye tracker data frame, derives rotation matrices from orientation data, applies them to a reference direction vector, and calculates the row-by-row angular difference for the vector rotation.

add_angular_diff(df, direction = c(0, 0, 1))

Arguments

df

Movement or eye tracker or combined/resampled data frame. Expects either columns `rot_x`, `rot_y`, `rot_z`, or columns `gaze_direction_x`, `gaze_direction_y`, `gaze_direction_z`

direction

Reference gaze vector direction (default: forward)

Value

Input data frame with column `angular_diff` added.