/// <summary>
/// Constructs a tetrahedron draft
/// </summary>
public static MeshDraft Tetrahedron(float radius, bool generateUV = true)
{
const float tetrahedralAngle = -19.471220333f;
var vertex0 = new Vector3(0, radius, 0);
var vertex1 = Geometry.PointOnSphere(radius, 0, tetrahedralAngle);
var vertex2 = Geometry.PointOnSphere(radius, 120, tetrahedralAngle);
var vertex3 = Geometry.PointOnSphere(radius, 240, tetrahedralAngle);
var draft = new MeshDraft {
name = "Tetrahedron"
};
if (generateUV)
{
var uv0 = new Vector2(0, 0);
var uv1 = new Vector2(0.5f, 1);
var uv2 = new Vector2(1, 0);
draft.AddTriangle(vertex2, vertex0, vertex1, true, uv0, uv1, uv2)
.AddTriangle(vertex2, vertex1, vertex3, true, uv0, uv1, uv2)
.AddTriangle(vertex3, vertex0, vertex2, true, uv0, uv1, uv2)
.AddTriangle(vertex1, vertex0, vertex3, true, uv0, uv1, uv2);
}
else
{
draft.AddTriangle(vertex2, vertex0, vertex1, true)
.AddTriangle(vertex2, vertex1, vertex3, true)
.AddTriangle(vertex3, vertex0, vertex2, true)
.AddTriangle(vertex1, vertex0, vertex3, true);
}
return(draft);
}
public static MeshDraft BaselessPyramid(Vector3 baseCenter, Vector3 apex, float radius, int segments,
bool inverted = false)
{
float segmentAngle = 360f / segments * (inverted ? -1 : 1);
float currentAngle = 0;
var vertices = new Vector3[segments + 1];
vertices[0] = apex;
for (var i = 1; i <= segments; i++)
{
vertices[i] = PTUtils.PointOnCircle3XZ(radius, currentAngle) + baseCenter;
currentAngle += segmentAngle;
}
var draft = new MeshDraft {
name = "BaselessPyramid"
};
for (var i = 1; i < segments; i++)
{
draft.AddTriangle(vertices[0], vertices[i], vertices[i + 1]);
}
draft.AddTriangle(vertices[0], vertices[vertices.Length - 1], vertices[1]);
return(draft);
}
public static MeshDraft BaselessPyramid(Vector3 apex, List <Vector3> ring)
{
var draft = new MeshDraft {
name = "BaselessPyramid"
};
for (var i = 0; i < ring.Count - 1; i++)
{
draft.AddTriangle(apex, ring[i], ring[i + 1]);
}
draft.AddTriangle(apex, ring[ring.Count - 1], ring[0]);
return(draft);
}
public static MeshDraft Triangle(Vector3 vertex0, Vector3 vertex1, Vector3 vertex2)
{
var draft = new MeshDraft
{
name = "Triangle",
uv = new List <Vector2>(3)
{
new Vector2(0, 0), new Vector2(0, 1), new Vector2(1, 1)
},
};
draft.AddTriangle(vertex0, vertex1, vertex2);
return(draft);
}
public static MeshDraft FlatBand(List <Vector3> lowerRing, List <Vector3> upperRing)
{
var draft = new MeshDraft {
name = "Flat band"
};
if (lowerRing.Count < 3 || upperRing.Count < 3)
{
throw new ArgumentException("Array sizes must be greater than 2");
}
if (lowerRing.Count != upperRing.Count)
{
throw new ArgumentException("Array sizes must be equal");
}
Vector3 v0, v1, v2, v3;
for (int i = 0; i < lowerRing.Count - 1; i++)
{
v0 = lowerRing[i];
v1 = upperRing[i];
v2 = lowerRing[i + 1];
v3 = upperRing[i + 1];
draft.AddTriangle(v0, v1, v2)
.AddTriangle(v2, v1, v3);
}
v0 = lowerRing[lowerRing.Count - 1];
v1 = upperRing[upperRing.Count - 1];
v2 = lowerRing[0];
v3 = upperRing[0];
draft.AddTriangle(v0, v1, v2)
.AddTriangle(v2, v1, v3);
return(draft);
}
