public Mesh ExtrudeAlong(BezierSpline spline, Vector3 down)
{
MeshBuilder meshBuilder = new MeshBuilder();
meshBuilder.BeforeNext(Matrix4x4.identity, new Vector3());
Vector3 lastTangent = spline.GetFirstDerivative(0, spline.pts[0]);
Quaternion quat = Quaternion.LookRotation(lastTangent, -down);
Vector3 up = down;
Vertex[] lastVerts = null;
for(int i = 0; i < spline.pts.Length; i ++)
{
BezierSpline.BezierPoint pt = spline.pts[i];
if (Vector3.Distance(pt.startPos, pt.endPos) > 0.001f)
{
int subdivisions = pt.numSubdivisions;
for (int div = 0; div <= subdivisions; div++)
{
float t = div / (float)pt.numSubdivisions;
Vector3 ptT = spline.GetPoint(t, pt);
Vector3 tangent = spline.GetFirstDerivative(t, pt).normalized;
quat = Quaternion.FromToRotation(lastTangent, tangent) * quat;
lastVerts = BuildNextSection(meshBuilder, ptT, tangent, quat, lastVerts);
lastTangent = tangent;
}
}
}
AddCap(meshBuilder, new Vector3[] { lastVerts[0].position, lastVerts[2].position, lastVerts[4].position, lastVerts[6].position }, true);
return meshBuilder.DoneCreateMesh();
}