kink3d / ksplines Goto Github PK

Currently Spline Agent evaluates based on t = 1 second / speed. Add an option to evaluate where speed is distance travelled along the spline in meters per second.

The spline system we used a few times had the option to get the closest point on the spline with a world position in parameter and a sample precision. It would be great to have it here as well!

In the code you have a function you say evaluates the normal:
internal static Vector3 EvaluateSplineSegmentNormal(SplinePoint pointA, SplinePoint pointB, float t)
{
// Evaluate the normal for value t between points A and B
return ((6.0f * (t * t)) - (6.0f * t)) * pointA.position + ((3.0f * (t * t)) - ((4.0f * t) + 1)) * pointA.GetHandle(Direction.Forward)
+ ((-6.0f * (t * t)) + (6.0f * t)) * pointB.position + ((3.0f * (t * t)) - (2.0f * t)) * pointB.GetHandle(Direction.Backward);
}

But as far as I know there is not a way to evaluate the normal just by multiplying the points P0..P1 by some polynomials. Generally you take the second derivative to get the curvature and cross it with the tangent then normalise. That should result in a normal/binormal. Could you elaborate on what this is and how you created it? I have never seen something like this before when it comes to evaluating normals of bezier curves.