public override void CreateMesh()
{
GeneratedMesh = MeshGenerator.CreatePlane(Direction, Width, Height, WidthSegments, HeightSegments, GenerateNormals, GenerateUVs);
}
public override void CreateMesh()
{
GeneratedMesh = MeshGenerator.CreateTorus(Radius, Thickness, Tessellation * 2, Tessellation, GenerateNormals, GenerateUVs);
}
public override void CreateMesh()
{
GeneratedMesh = MeshGenerator.CreateWireBox(SizeX, SizeY, SizeZ);
}
private Mesh Create(float radius, int tessellation, bool generateNormals, bool generateUVs, bool invert)
{
if (tessellation < 0)
{
tessellation = 0;
}
subdividedEdges = new Dictionary <UndirectedEdge, int>();
// Start with an octahedron; copy the data into the vertex/index collection.
vertexPositions = new List <Vector3>(OctahedronVertices);
indexList = new List <int>(OctahedronIndices);
// We know these values by looking at the above index list for the octahedron. Despite the subdivisions that are
// about to go on, these values aren't ever going to change because the vertices don't move around in the array.
// We'll need these values later on to fix the singularities that show up at the poles.
int northPoleIndex = 0;
int southPoleIndex = 5;
for (int iSubdivision = 0; iSubdivision < tessellation; ++iSubdivision)
{
// The new index collection after subdivision.
var newIndices = new List <int>();
subdividedEdges.Clear();
int triangleCount = indexList.Count / 3;
for (int iTriangle = 0; iTriangle < triangleCount; ++iTriangle)
{
// For each edge on this triangle, create a new vertex in the middle of that edge.
// The winding order of the triangles we output are the same as the winding order of the inputs.
// Indices of the vertices making up this triangle
int iv0 = indexList[iTriangle * 3];
int iv1 = indexList[iTriangle * 3 + 1];
int iv2 = indexList[iTriangle * 3 + 2];
// Get the new vertices
Vector3 v01; // vertex on the midpoint of v0 and v1
Vector3 v12; // ditto v1 and v2
Vector3 v20; // ditto v2 and v0
int iv01; // index of v01
int iv12; // index of v12
int iv20; // index of v20
// Add/get new vertices and their indices
DivideEdge(iv0, iv1, out v01, out iv01);
DivideEdge(iv1, iv2, out v12, out iv12);
DivideEdge(iv0, iv2, out v20, out iv20);
// Add the new indices. We have four new triangles from our original one:
// v0
// o
// /a\
// v20 o---o v01
// /b\c/d\
// v2 o---o---o v1
// v12
// a
newIndices.Add(iv0);
newIndices.Add(iv01);
newIndices.Add(iv20);
// b
newIndices.Add(iv20);
newIndices.Add(iv12);
newIndices.Add(iv2);
// d
newIndices.Add(iv20);
newIndices.Add(iv01);
newIndices.Add(iv12);
// d
newIndices.Add(iv01);
newIndices.Add(iv1);
newIndices.Add(iv12);
}
indexList.Clear();
indexList.AddRange(newIndices);
}
// Now that we've completed subdivision, fill in the final vertex collection
int vertexCount = vertexPositions.Count;
vertices = new List <Vector3>(vertexCount);
normals = new List <Vector3>(vertexCount);
uvs = new List <Vector2>(vertexCount);
for (int i = 0; i < vertexPositions.Count; ++i)
{
var vertexValue = vertexPositions[i];
var normal = vertexValue;
normal.Normalize();
var pos = normal * radius;
// calculate texture coordinates for this vertex
float longitude = Mathf.Atan2(normal.x, -normal.z);
float latitude = Mathf.Acos(normal.y);
float u = (float)(longitude / (Mathf.PI * 2.0) + 0.5);
float v = 1f - (float)(latitude / Mathf.PI);
Vector2 texcoord = new Vector2(u, v);
vertices.Add(pos);
normals.Add(normal);
uvs.Add(texcoord);
}
float eps = 1e-7f;
// There are a couple of fixes to do. One is a texture coordinate wraparound fixup. At some point, there will be
// a set of triangles somewhere in the mesh with texture coordinates such that the wraparound across 0.0/1.0
// occurs across that triangle. Eg. when the left hand side of the triangle has a U coordinate of 0.98 and the
// right hand side has a U coordinate of 0.0. The intent is that such a triangle should render with a U of 0.98 to
// 1.0, not 0.98 to 0.0. If we don't do this fixup, there will be a visible seam across one side of the sphere.
//
// Luckily this is relatively easy to fix. There is a straight edge which runs down the prime meridian of the
// completed sphere. If you imagine the vertices along that edge, they circumscribe a semicircular arc starting at
// y=1 and ending at y=-1, and sweeping across the range of z=0 to z=1. x stays zero. It's along this edge that we
// need to duplicate our vertices - and provide the correct texture coordinates.
int preCount = vertices.Count;
indices = indexList.ToArray();
for (int i = 0; i < preCount; ++i)
{
// This vertex is on the prime meridian if position.x and texcoord.u are both zero (allowing for small epsilon).
bool isOnPrimeMeridian = Mathf.Abs(vertices[i].x) < eps && Mathf.Abs(1f - uvs[i].x) < eps;
if (isOnPrimeMeridian)
{
int newIndex = vertices.Count;
// copy this vertex, correct the texture coordinate, and add the vertex
vertices.Add(vertices[i]);
normals.Add(normals[i]);
uvs.Add(new Vector2(0f, uvs[i].y));
// Now find all the triangles which contain this vertex and update them if necessary
for (int j = 0; j < indexList.Count; j += 3)
{
int triIndex0 = indices[j];
int triIndex1 = indices[j + 1];
int triIndex2 = indices[j + 2];
int jTemp = j;
if (triIndex0 == i)
{
// nothing; just keep going
}
else if (triIndex1 == i)
{
int temp = triIndex0;
triIndex0 = triIndex1;
triIndex1 = temp;
jTemp = j + 1;
}
else if (triIndex2 == i)
{
int temp = triIndex0;
triIndex0 = triIndex2;
triIndex2 = temp;
jTemp = j + 2;
}
else
{
// this triangle doesn't use the vertex we're interested in
continue;
}
// check the other two vertices to see if we might need to fix this triangle
if (Mathf.Abs(uvs[triIndex0].x - uvs[triIndex1].x) > 0.5f ||
Mathf.Abs(uvs[triIndex0].x - uvs[triIndex2].x) > 0.5f)
{
// yep; replace the specified index to point to the new, corrected vertex
indices[jTemp] = newIndex;
}
}
}
}
FixPole(northPoleIndex);
FixPole(southPoleIndex);
Mesh m = new Mesh();
m.name = "GeoSphere";
m.vertices = vertices.ToArray();
m.SetIndices(indices, MeshTopology.Triangles, 0);
if (generateNormals)
{
m.normals = normals.ToArray();
}
if (generateUVs)
{
m.uv = uvs.ToArray();
}
if (invert)
{
MeshGenerator.Invert(m);
}
return(m);
}
public override void CreateMesh()
{
GeneratedMesh = MeshGenerator.CreateCylinder(Radius, Height, Sides, GenerateCaps, GenerateNormals, GenerateUVs, Invert);
}
public override void CreateMesh()
{
GeneratedMesh = MeshGenerator.CreateArrow(Direction, LineLength, LineThickness, CapLength, CapThickness, CapOverhang, GenerateNormals);
}
public override void CreateMesh()
{
GeneratedMesh = MeshGenerator.CreateTube(OuterRadius, InnerRadius, Height, Sides, GenerateNormals, GenerateUVs);
}
public override void CreateMesh()
{
GeneratedMesh = MeshGenerator.CreateOutlinedBox(SizeX, SizeY, SizeZ, Outline, GenerateNormals, GenerateUVs);
}