public static SurfaceComponentGeometry CreateRegularPolygonGeometry(
float radius, int segmentP, int surfaceGroup = 0, RenderGeometry.FaceType faceType = RenderGeometry.FaceType.Polygonal, bool splitBoundary = false)
{
SurfaceComponentGeometry geometry = new SurfaceComponentGeometry();
bool normalRequired = (faceType != RenderGeometry.FaceType.Polygonal && faceType != RenderGeometry.FaceType.Triangular);
float dth = 2 * Mathf.PI / segmentP;
for (int i = 0; i < segmentP; i++)
{
geometry.CreateVertex(new Vector3(radius * Mathf.Cos(dth * i), 0, -radius * Mathf.Sin(dth * i)));
}
Face f = geometry.CreateFace(geometry.vertices.ToArray());
f.surfaceGroup = surfaceGroup;
geometry.SetFaceType(f, faceType);
if (normalRequired)
{
foreach (Halfedge e in geometry.halfedges)
{
geometry.SetNormal(e, Vector3.up);
}
}
geometry.DefineBoundaries(geometry.vertices[0]);
if (splitBoundary)
{
geometry.SplitBoundaries();
}
return(geometry);
}
public static SurfaceComponentGeometry CreateStarConvexPolygonGeometry(List <Vector3> vertices, int surfaceGroup = 0, RenderGeometry.FaceType faceType = RenderGeometry.FaceType.Polygonal)
{
SurfaceComponentGeometry geometry = new SurfaceComponentGeometry();
bool normalRequired = (faceType != RenderGeometry.FaceType.Polygonal && faceType != RenderGeometry.FaceType.Triangular);
foreach (Vector3 vertex in vertices)
{
geometry.CreateVertex(vertex);
}
for (int i = 1; i < vertices.Count - 1; i++)
{
Face f = geometry.CreateFace(geometry.vertices[0], geometry.vertices[i], geometry.vertices[i + 1]);
f.surfaceGroup = surfaceGroup;
geometry.SetFaceType(f, faceType);
}
if (normalRequired)
{
Vector3 normal = Vector3.Cross(geometry.vertices[1].p - geometry.vertices[0].p, geometry.vertices[vertices.Count - 1].p - geometry.vertices[0].p).normalized;
foreach (Halfedge e in geometry.halfedges)
{
geometry.SetNormal(e, normal);
}
}
geometry.DefineBoundaries(geometry.vertices[0]);
geometry.SplitBoundaries();
return(geometry);
}
public static SurfaceComponentGeometry CreatePlaneGeometry(
float sizeX, float sizeZ, int segmentX, int segmentZ, int surfaceGroup = 0, RenderGeometry.FaceType faceType = RenderGeometry.FaceType.Smooth)
{
SurfaceComponentGeometry geometry = new SurfaceComponentGeometry();
bool normalRequired = (faceType != RenderGeometry.FaceType.Polygonal && faceType != RenderGeometry.FaceType.Triangular);
bool tangentRequired = (faceType == RenderGeometry.FaceType.Directinal1 || faceType == RenderGeometry.FaceType.Directinal2);
Vector3 origin = new Vector3(-sizeX / 2, 0, -sizeZ / 2);
Vector3 d = new Vector3(sizeX / segmentX, 0, sizeZ / segmentZ);
for (int x = 0; x <= segmentX; x++)
{
for (int z = 0; z <= segmentZ; z++)
{
geometry.CreateVertex(origin + new Vector3(d.x * x, 0, d.z * z));
}
}
Vertex vertice(int x, int z) => geometry.vertices[x * (segmentZ + 1) + z];
for (int x = 0; x < segmentX; x++)
{
for (int z = 0; z < segmentZ; z++)
{
Face f = geometry.CreateFace(vertice(x, z), vertice(x, z + 1), vertice(x + 1, z + 1), vertice(x + 1, z));
f.surfaceGroup = surfaceGroup;
geometry.SetFaceType(f, faceType);
}
}
if (normalRequired)
{
foreach (Halfedge e in geometry.halfedges)
{
geometry.SetNormal(e, Vector3.up);
}
}
if (tangentRequired)
{
foreach (Halfedge e in geometry.halfedges)
{
geometry.SetTangent(e, -e.vector.normalized);
}
}
geometry.DefineBoundaries(vertice(0, 0), vertice(0, segmentZ), vertice(segmentX, segmentZ), vertice(segmentX, 0));
return(geometry);
}
public static SurfaceComponentGeometry CreateTriangleGeometry(
float sizeBase, float sizeHeight, float offsetTop, int segment, bool divideHeightOnly = false, int surfaceGroup = 0, RenderGeometry.FaceType faceType = RenderGeometry.FaceType.Smooth)
{
SurfaceComponentGeometry geometry = new SurfaceComponentGeometry();
bool normalRequired = (faceType != RenderGeometry.FaceType.Polygonal && faceType != RenderGeometry.FaceType.Triangular);
Vector3 corner = new Vector3(-sizeBase / 2, 0, 0);
Vector3 dx = new Vector3(sizeBase / segment, 0, 0);
Vector3 dz = new Vector3((offsetTop + 0.5f) * sizeBase / segment, 0, sizeHeight / segment);
if (divideHeightOnly)
{
for (int z = 0; z < segment; z++)
{
geometry.CreateVertex(corner + dz * z);
geometry.CreateVertex(corner + dz * z + dx * (segment - z));
}
geometry.CreateVertex(corner + dz * segment);
for (int z = 0; z < segment - 1; z++)
{
geometry.CreateFace(geometry.vertices[2 * z], geometry.vertices[2 * z + 2], geometry.vertices[2 * z + 3], geometry.vertices[2 * z + 1]);
}
geometry.CreateFace(geometry.vertices[2 * segment - 2], geometry.vertices[2 * segment], geometry.vertices[2 * segment - 1]);
geometry.DefineBoundaries(geometry.vertices[0], geometry.vertices[2 * segment], geometry.vertices[1]);
}
else
{
// Full triangular subdivision
for (int x = 0; x <= segment; x++)
{
for (int z = 0; z <= segment - x; z++)
{
geometry.CreateVertex(corner + dx * x + dz * z);
}
}
Vertex vertice(int x, int z) => geometry.vertices[x * (2 * (segment + 1) - (x - 1)) / 2 + z];
for (int x = 0; x < segment; x++)
{
for (int z = 0; z < segment - x; z++)
{
geometry.CreateFace(vertice(x, z), vertice(x, z + 1), vertice(x + 1, z));
if (x + z < segment - 1)
{
geometry.CreateFace(vertice(x + 1, z), vertice(x, z + 1), vertice(x + 1, z + 1));
}
}
}
geometry.DefineBoundaries(vertice(0, 0), vertice(0, segment), vertice(segment, 0));
}
foreach (Face f in geometry.faces)
{
f.surfaceGroup = surfaceGroup;
geometry.SetFaceType(f, faceType);
}
if (normalRequired)
{
foreach (Halfedge e in geometry.halfedges)
{
geometry.SetNormal(e, Vector3.up);
}
}
return(geometry);
}
public static SurfaceComponentGeometry CreateConeCapGeometry(
float radius, float height, int segmentP, int segmentR, float cutAngle = 0, int surfaceGroup = 0, RenderGeometry.FaceType faceType = RenderGeometry.FaceType.Smooth,
bool splitBoundary = false)
{
SurfaceComponentGeometry geometry = new SurfaceComponentGeometry();
bool normalRequired = (faceType != RenderGeometry.FaceType.Polygonal && faceType != RenderGeometry.FaceType.Triangular);
bool tangentRequired = (faceType == RenderGeometry.FaceType.Directinal1 || faceType == RenderGeometry.FaceType.Directinal2);
int n = cutAngle > 0 ? segmentP + 1 : segmentP;
float deltaAngle = (2 * Mathf.PI - cutAngle) / segmentP;
float Angle(float th) => cutAngle + deltaAngle * th;
for (int rr = 0; rr < segmentR; rr++)
{
for (int th = 0; th < n; th++)
{
float r = radius * (segmentR - rr) / segmentR;
float h = height * rr / segmentR;
geometry.CreateVertex(new Vector3(r * Mathf.Cos(Angle(th)), h, -r * Mathf.Sin(Angle(th))));
}
}
Vertex vertice(int rr, int th) => geometry.vertices[rr * n + th];
Vertex center = geometry.CreateVertex(new Vector3(0, height, 0));
for (int rr = 0; rr < segmentR - 1; rr++)
{
for (int th = 0; th < segmentP; th++)
{
int th2 = (th + 1) % n;
Face f = geometry.CreateFace(vertice(rr, th), vertice(rr, th2), vertice(rr + 1, th2), vertice(rr + 1, th));
if (tangentRequired)
{
List <Halfedge> edges = f.edges;
geometry.SetTangent(edges[1], -edges[1].vector.normalized);
geometry.SetTangent(edges[3], -edges[3].vector.normalized);
geometry.SetTangent(edges[0], new Vector3(Mathf.Sin(Angle(th2)), 0, Mathf.Cos(Angle(th2))));
geometry.SetTangent(edges[2], new Vector3(-Mathf.Sin(Angle(th)), 0, -Mathf.Cos(Angle(th))));
if (rr == 0)
{
geometry.SetTangent(edges[0].opposite, new Vector3(-Mathf.Sin(Angle(th)), 0, -Mathf.Cos(Angle(th))));
}
}
}
}
for (int th = 0; th < segmentP; th++)
{
int th2 = (th + 1) % n;
Face f = geometry.CreateFace(vertice(segmentR - 1, th), vertice(segmentR - 1, th2), center);
if (tangentRequired)
{
List <Halfedge> edges = f.edges;
geometry.SetTangent(edges[1], -edges[1].vector.normalized);
geometry.SetTangent(edges[2], -edges[2].vector.normalized);
geometry.SetTangent(edges[0], new Vector3(Mathf.Sin(Angle(th2)), 0, Mathf.Cos(Angle(th2))));
}
}
foreach (Face f in geometry.faces)
{
f.surfaceGroup = surfaceGroup;
geometry.SetFaceType(f, faceType);
}
if (normalRequired)
{
if (height == 0)
{
foreach (Halfedge e in geometry.halfedges)
{
geometry.SetNormal(e, Vector3.up);
}
}
else
{
for (int rr = 0; rr < segmentR; rr++)
{
for (int th = 0; th < n; th++)
{
geometry.SetNormal(vertice(rr, th), new Vector3(Mathf.Cos(Angle(th)), radius / height, -Mathf.Sin(Angle(th))).normalized, surfaceGroup);
}
}
foreach (Halfedge e in center.edges)
{
geometry.SetNormal(e, Vector3.Cross(e.vector, e.next.vector).normalized);
}
}
}
if (cutAngle == 0)
{
geometry.DefineBoundaries(vertice(0, 0));
}
else
{
geometry.DefineBoundaries(vertice(0, 0), vertice(0, n - 1), center);
}
if (splitBoundary)
{
geometry.SplitBoundaries();
}
return(geometry);
}