Method splineForward

core/src/processing/core/PGraphics.java:3682–3691

Setup forward-differencing matrix to be used for speedy curve rendering. It's based on using a specific number of curve segments and just doing incremental adds for each vertex of the segment, rather than running the mathematically expensive cubic equation. @param segments number of curve segments t

(int segments, PMatrix3D matrix)

   * @param matrix target object for the new matrix
   */
  protected void splineForward(int segments, PMatrix3D matrix) {
    float f  = 1.0f / segments;
    float ff = f * f;
    float fff = ff * f;

    matrix.set(0,     0,    0, 1,
               fff,   ff,   f, 0,
               6*fff, 2*ff, 0, 0,
               6*fff, 0,    0, 0);
  }