List <TreeSegment> BuildSegments(TreeData data, float fromRadius, float toRadius, Vector3 normal, Vector3 binormal)
{
var segments = new List <TreeSegment>();
var points = new List <Vector3>();
var length = (to - from).magnitude;
var bend = length * (normal * data.GetRandomBendDegree() + binormal * data.GetRandomBendDegree());
points.Add(from);
points.Add(Vector3.Lerp(from, to, 0.25f) + bend);
points.Add(Vector3.Lerp(from, to, 0.75f) + bend);
points.Add(to);
var curve = new CatmullRomCurve(points);
var frames = curve.ComputeFrenetFrames(data.heightSegments, normal, binormal, false);
for (int i = 0, n = frames.Count; i < n; i++)
{
var u = 1f * i / (n - 1);
var radius = Mathf.Lerp(fromRadius, toRadius, u);
var position = curve.GetPointAt(u);
var segment = new TreeSegment(frames[i], position, radius);
segments.Add(segment);
}
return(segments);
}
void DrawCurve()
{
const float size = 0.025f;
Gizmos.matrix = transform.localToWorldMatrix;
var frames = curve.ComputeFrenetFrames(tubularSegments, closed);
for (int i = 0, n = tubularSegments; i < n; i++)
{
var u0 = 1f * i / tubularSegments;
var p0 = curve.GetPointAt(u0);
// draw line
if (i < n - 1)
{
var u1 = 1f * (i + 1) / tubularSegments;
var p1 = curve.GetPointAt(u1);
Gizmos.color = Color.white;
Gizmos.DrawLine(p0, p1);
}
Gizmos.color = Color.green;
Gizmos.DrawSphere(p0, size);
var frame = frames[i];
var N = frame.Normal;
var B = frame.Binormal;
Gizmos.color = Color.yellow;
var radius = size * 4f;
for (int j = 0; j <= radialSegments; j++)
{
// 0.0 ~ 2π
float rad0 = 1f * j / radialSegments * PI2;
float rad1 = 1f * (j + 1) / radialSegments * PI2;
float cos0 = Mathf.Cos(rad0), sin0 = Mathf.Sin(rad0);
float cos1 = Mathf.Cos(rad1), sin1 = Mathf.Sin(rad1);
var normal0 = (cos0 * N + sin0 * B).normalized;
var normal1 = (cos1 * N + sin1 * B).normalized;
var v0 = (p0 + radius * normal0);
var v1 = (p0 + radius * normal1);
Gizmos.DrawLine(v0, v1);
}
}
}
