private void AddTopCap(ExtrusionPoint point, Orientation orientation)
{
_vertices.Add(point.Position);
_vertices.AddRange(orientation.GetRing(_sideSegmentCount, point));
_normals.AddRange(Enumerable.Repeat(-orientation.Direction, _sideSegmentCount + 1));
_uvs.AddRange(Enumerable.Repeat(new Vector2(0, 0), _sideSegmentCount + 1));
}
private Mesh Generate()
{
_vertices = new List <Vector3>();
_normals = new List <Vector3>();
_uvs = new List <Vector2>();
var uOffset = 0f;
var ringCount = 0;
ExtrusionPoint currentPoint, nextPoint = null;
var orientation = new Orientation(GetDirection(0));
for (int i = 0; i < _trajectory.Count - 1; i++)
{
currentPoint = _trajectory[i];
nextPoint = _trajectory[i + 1];
uOffset = i / (float)(_trajectory.Count - 1);
var direction = GetDirection(i);
orientation.TransformDirection(direction);
if (_isCapped && i == 0)
{
AddTopCap(currentPoint, orientation);
}
AddRing(uOffset, currentPoint, orientation);
ringCount++;
}
orientation.TransformDirection(GetDirection(_trajectory.Count - 1));
AddRing(uOffset, nextPoint, orientation);
ringCount++;
if (_isCapped)
{
AddBottomCap(nextPoint, orientation);
}
var mesh = new Mesh();
mesh.Vertices = _vertices;
mesh.Normals = _normals;
mesh.TexCoords = _uvs;
mesh.Indices = GetIndices(ringCount);
mesh.Type = PrimitiveType.Triangles;
mesh.DrawStyle = PolygonMode.Fill;
mesh.FrontFace = FrontFaceDirection.CounterClockwise;
mesh.CalculateBounds();
_vertices = null;
_normals = null;
_uvs = null;
return(mesh);
}
public static ExtrusionPoint Lerp(ExtrusionPoint p1, ExtrusionPoint p2, float v)
{
var result = new ExtrusionPoint();
result.Radius = p1.Radius * (1 - v) + p2.Radius * v;
result.Position = Vector3.Lerp(p1.Position, p2.Position, v);
return(result);
}
private void AddRing(float uOffset, ExtrusionPoint currentPoint, Orientation orientation)
{
var ringVertices = orientation.GetRing(_sideSegmentCount, currentPoint);
var ringNormals = orientation.GetRingNormals(_sideSegmentCount);
var ringUVs = orientation.GetRingUVs(_sideSegmentCount, uOffset);
_vertices.AddRange(ringVertices);
_normals.AddRange(ringNormals);
_uvs.AddRange(ringUVs);
}
public Vector3[] GetRing(int sideSegmentCount, ExtrusionPoint point)
{
var vertices = new List <Vector3>();
for (int i = 0; i < sideSegmentCount; i++)
{
var v = point.Radius * BasisX * MathF.Cos(MathF.PI * 2 * i / (sideSegmentCount - 1)) +
point.Radius * BasisY * MathF.Sin(MathF.PI * 2 * i / (sideSegmentCount - 1)) +
point.Position;
vertices.Add(v);
}
return(vertices.ToArray());
}
