// Interpolation with a cubic curve
// Resolves to ((1-t)^3)a + 3t((1-t)^2)b + 3t^2(1-t)c + (t^3)d
public static Vector2 Cerp(SplineChunk chunk, float t)
{
Vector2 qerpABC = Qerp(chunk.a, chunk.b, chunk.c, t);
Vector2 qerpBCD = Qerp(chunk.b, chunk.c, chunk.d, t);
return(Lerp(qerpABC, qerpBCD, t));
}
private void RenderCubic(SplineChunk splineChunk)
{
int oldPositionCount = lineRenderer.positionCount;
lineRenderer.positionCount = lineRenderer.positionCount + linesPerUnit + 1;
float step = 1f / linesPerUnit;
float t = 0;
for (int i = oldPositionCount; i < lineRenderer.positionCount; i++, t += step)
{
lineRenderer.SetPosition(i, Spline.Cerp(splineChunk, t));
}
}