//Methods
//--------------------------------------------
public Level()
{
_spline = new BezierSpline.BezierSpline();
}
/// <inheritdoc />
public LevelNodeChunk.MeshData GetMesh(BezierSpline.BezierSpline spline, IShaper previous, int offset, int length)
{
Debug.Assert(offset + length <= spline.Length, "Trying to generate mesh that is longer than the spline it is based on! " + (offset + length) + " > " + spline.Length);
var mesh = new LevelNodeChunk.MeshData();
List <Vector3> vertices = new List <Vector3>();
List <int> triangles = new List <int>();
List <Vector2> UVs = new List <Vector2>();
var meshResolutionParallel = Config.Instance.Global.Level.Mesh.Resolution.Parallel;
var meshResolutionNormal = Config.Instance.Global.Level.Mesh.Resolution.Normal;
var radius = Config.Instance.Global.Level.Mesh.Radius;
//we have to save our old normal so we can use that as a second vector for our normal calculation
Vector3 oldNormal = previous.LastNormal;
for (int i = 0; i < length; i++)
{
for (int x = 0; x <= meshResolutionParallel; x++)
{
float u = offset + i + ((float)x / meshResolutionParallel);
Vector3 center = spline.Evaluate(u);
Vector3 tangent = spline.GetDerivative(u, 1);
Vector3 normal = spline.GetNormal(u).normalized;
//for the first ring we have to use the last shapers values
if (i == 0 && x == 0)
{
oldNormal = previous.LastNormal;
normal = previous.LastNormal;
center = previous.LastPoint;
tangent = previous.LastDirection;
}
else
{
// project normal onto tangent plane so the rotation stays somewhat within that plane
Plane p = new Plane(tangent, Vector3.zero);
// rotate toward target normal
Vector3 newNormal = Vector3.RotateTowards(oldNormal, normal, Mathf.Deg2Rad * 10.0f / meshResolutionParallel, 0);
//then rotate to plane
newNormal = Vector3.RotateTowards(newNormal, p.ClosestPointOnPlane(oldNormal), Mathf.Deg2Rad * 10.0f, 0);
// check if all vectors are planar. We don't want that
if (newNormal != normal && Vector3.Cross(Vector3.Cross(tangent, oldNormal), Vector3.Cross(tangent, newNormal)) == Vector3.zero)
{
newNormal = Quaternion.AngleAxis(10, tangent) * oldNormal; // rotate the normal out of the same plane as tangent and targetnormal
}
oldNormal = newNormal;
normal = newNormal;
LastPoint = center;
LastDirection = tangent;
LastNormal = normal;
}
Debug.Assert(Vector3.Cross(normal, tangent) != Vector3.zero, "Tangent and Normal are parallel. something went wrong when calculating the normal.");
Debug.Assert(tangent != Vector3.zero, "Tangent is zero! Do you have a duplicate pont in the spline?");
if (Vector3.Cross(normal, tangent) == Vector3.zero)
{
Vector3.Cross(normal, tangent);
}
//Generate tube segment. We need to overlap the first and the last vertices because we need UV 0 and 1 on the same spot
for (int n = 0; n <= meshResolutionNormal; n++)
{
//rotate the normal arount the center
Vector3 vert = center + Quaternion.AngleAxis(n * 360.0f / meshResolutionNormal, tangent) * normal.normalized * radius;
vertices.Add(vert);
float xUV = (float)(i * meshResolutionParallel + x) / (spline.Points.Count * meshResolutionParallel);
float yUV = (float)n / meshResolutionNormal;
UVs.Add(new Vector2(xUV, yUV));
}
//connect tube segment to last one
if (i != 0 || x > 0) //do not do this for the very first segment
{
//calculate stride per segment
int segmentFirstIndex = (i * meshResolutionParallel + x) * (meshResolutionNormal + 1);
int lastSegmentFirstIndex = segmentFirstIndex - (meshResolutionNormal + 1);
for (int n = 1; n <= meshResolutionNormal + 1; n++)
{
//generate double faced quad between tube segments
//using modulo to connect last vertex to first
triangles.AddRange(MakeQuad(
lastSegmentFirstIndex + n % (meshResolutionNormal + 1),
lastSegmentFirstIndex + (n - 1) % (meshResolutionNormal + 1),
segmentFirstIndex + (n - 1) % (meshResolutionNormal + 1),
segmentFirstIndex + n % (meshResolutionNormal + 1)
)
);
}
}
}
}
mesh.Vertices = vertices;
mesh.Triangles = triangles;
mesh.UVs = UVs;
return(mesh);
}
