/// <summary>
/// Constructs a cylinder draft
/// </summary>
public static MeshDraft Cylinder(float radius, int segments, float height, bool generateUV = true)
{
float segmentAngle = 360f / segments;
float currentAngle = 0;
Vector3 halfHeightUp = Vector3.up * height / 2;
var draft = new MeshDraft {
name = "Cylinder"
};
var lowerRing = new List <Vector3>(segments);
var lowerDiskUV = new List <Vector2>();
var upperRing = new List <Vector3>(segments);
var upperDiskUV = new List <Vector2>();
var strip = new List <Vector3>();
var stripNormals = new List <Vector3>();
var stripUV = new List <Vector2>();
for (var i = 0; i < segments; i++)
{
Vector3 lowerVertex;
Vector3 upperVertex;
AddCylinderPoints(radius, currentAngle, halfHeightUp, generateUV,
ref strip, ref stripUV, ref stripNormals, out lowerVertex, out upperVertex);
lowerRing.Add(lowerVertex);
upperRing.Add(upperVertex);
if (generateUV)
{
Vector2 uv = Geometry.PointOnCircle2(0.5f, currentAngle) + new Vector2(0.5f, 0.5f);
upperDiskUV.Add(uv);
uv.x = 1 - uv.x;
lowerDiskUV.Add(uv);
}
currentAngle += segmentAngle;
}
Vector3 lowerSeamVertex;
Vector3 upperSeamVertex;
AddCylinderPoints(radius, currentAngle, halfHeightUp, generateUV,
ref strip, ref stripUV, ref stripNormals, out lowerSeamVertex, out upperSeamVertex);
if (generateUV)
{
draft.AddTriangleFan(lowerRing, Vector3.down, lowerDiskUV, true);
draft.AddTriangleFan(upperRing, Vector3.up, upperDiskUV);
draft.AddTriangleStrip(strip, stripNormals, stripUV);
}
else
{
draft.AddTriangleFan(lowerRing, Vector3.down, true);
draft.AddTriangleFan(upperRing, Vector3.up);
draft.AddTriangleStrip(strip, stripNormals);
}
return(draft);
}
/// <remarks>
/// https://en.wikipedia.org/wiki/Triangle_strip
/// </remarks>
public static MeshDraft TriangleStrip(List <Vector3> strip, Vector3 normal)
{
var draft = new MeshDraft
{
name = "TriangleStrip",
uv = new List <Vector2>(strip.Count),
};
draft.AddTriangleStrip(strip, normal);
for (int i = 0; i < strip.Count; i++)
{
draft.uv.Add(new Vector2((float)i / strip.Count, (float)i / strip.Count));
}
return(draft);
}
