public static Color32 CalcFaceColor(
ConwayPoly conway,
Color[] colors,
PolyHydraEnums.ColorMethods colorMethod,
int i)
{
Color32 color;
var face = conway.Faces[i];
var faceRole = conway.FaceRoles[i];
switch (colorMethod)
{
case PolyHydraEnums.ColorMethods.ByRole:
color = colors[(int)faceRole];
break;
case PolyHydraEnums.ColorMethods.BySides:
color = colors[face.Sides % colors.Length];
break;
case PolyHydraEnums.ColorMethods.ByFaceDirection:
color = colors[CalcDirectionIndex(face, colors.Length - 1)];
break;
case PolyHydraEnums.ColorMethods.ByTags:
var c = new Color();
if (conway.FaceTags[i].Count > 0)
{
string htmlColor = conway.FaceTags[i].First(t => t.Item1.StartsWith("#")).Item1;
if (!(ColorUtility.TryParseHtmlString(htmlColor, out c)))
{
if (!ColorUtility.TryParseHtmlString(htmlColor.Replace("#", ""), out c))
{
c = Color.white;
}
}
color = c;
}
else
{
color = Color.white;
}
break;
default:
color = Color.white;
break;
}
return(color);
}
// new Color(1.0f, 0.75f, 0.75f),
// new Color(1.0f, 0.5f, 0.5f),
// new Color(0.8f, 0.4f, 0.4f),
// new Color(0.8f, 0.8f, 0.8f),
// new Color(0.5f, 0.6f, 0.6f),
// new Color(0.6f, 0.0f, 0.0f),
// new Color(1.0f, 1.0f, 1.0f),
// new Color(0.6f, 0.6f, 0.6f),
// new Color(0.5f, 1.0f, 0.5f),
// new Color(0.5f, 0.5f, 1.0f),
// new Color(0.5f, 1.0f, 1.0f),
// new Color(1.0f, 0.5f, 1.0f),
public static Mesh BuildMeshFromConwayPoly(
ConwayPoly conway,
bool generateSubmeshes = false,
Color[] colors = null,
PolyHydraEnums.ColorMethods colorMethod = PolyHydraEnums.ColorMethods.ByRole,
PolyHydraEnums.UVMethods uvMethod = PolyHydraEnums.UVMethods.FirstEdge,
bool largeMeshFormat = true
)
{
Vector2 calcUV(Vector3 point, Vector3 xAxis, Vector3 yAxis)
{
float u, v;
u = Vector3.Project(point, xAxis).magnitude;
u *= Vector3.Dot(point, xAxis) > 0 ? 1 : -1;
v = Vector3.Project(point, yAxis).magnitude;
v *= Vector3.Dot(point, yAxis) > 0 ? 1 : -1;
return(new Vector2(u, v));
}
if (colors == null)
{
colors = DefaultFaceColors;
}
var target = new Mesh();
if (largeMeshFormat)
{
target.indexFormat = IndexFormat.UInt32;
}
var meshTriangles = new List <int>();
var meshVertices = new List <Vector3>();
var meshNormals = new List <Vector3>();
var meshColors = new List <Color32>();
var meshUVs = new List <Vector2>();
var edgeUVs = new List <Vector2>();
var barycentricUVs = new List <Vector3>();
var miscUVs1 = new List <Vector4>();
var miscUVs2 = new List <Vector4>();
List <ConwayPoly.Roles> uniqueRoles = null;
List <int> uniqueSides = null;
List <string> uniqueTags = null;
var submeshTriangles = new List <List <int> >();
// TODO
// var hasNaked = conway.HasNaked();
// Strip down to Face-Vertex structure
var points = conway.ListVerticesByPoints();
var faceIndices = conway.ListFacesByVertexIndices();
// Add faces
int index = 0;
if (generateSubmeshes)
{
switch (colorMethod)
{
case PolyHydraEnums.ColorMethods.ByRole:
uniqueRoles = new HashSet <ConwayPoly.Roles>(conway.FaceRoles).ToList();
for (int i = 0; i < uniqueRoles.Count; i++)
{
submeshTriangles.Add(new List <int>());
}
break;
case PolyHydraEnums.ColorMethods.BySides:
for (int i = 0; i < colors.Length; i++)
{
submeshTriangles.Add(new List <int>());
}
break;
case PolyHydraEnums.ColorMethods.ByFaceDirection:
for (int i = 0; i < colors.Length; i++)
{
submeshTriangles.Add(new List <int>());
}
break;
case PolyHydraEnums.ColorMethods.ByTags:
var flattenedTags = conway.FaceTags.SelectMany(d => d.Select(i => i.Item1));
uniqueTags = new HashSet <string>(flattenedTags).ToList();
for (int i = 0; i < uniqueTags.Count + 1; i++)
{
submeshTriangles.Add(new List <int>());
}
break;
}
}
for (var i = 0; i < faceIndices.Length; i++)
{
var faceIndex = faceIndices[i];
var face = conway.Faces[i];
var faceNormal = face.Normal;
var faceCentroid = face.Centroid;
ConwayPoly.Roles faceRole = conway.FaceRoles[i];
// Axes for UV mapping
Vector3 xAxis = Vector3.right;
Vector3 yAxis = Vector3.up;
switch (uvMethod)
{
case PolyHydraEnums.UVMethods.FirstEdge:
xAxis = face.Halfedge.Vector;
yAxis = Vector3.Cross(xAxis, faceNormal);
break;
case PolyHydraEnums.UVMethods.BestEdge:
xAxis = face.GetBestEdge().Vector;
yAxis = Vector3.Cross(xAxis, faceNormal);
break;
case PolyHydraEnums.UVMethods.FirstVertex:
yAxis = face.Centroid - face.GetVertices()[0].Position;
xAxis = Vector3.Cross(yAxis, faceNormal);
break;
case PolyHydraEnums.UVMethods.BestVertex:
yAxis = face.Centroid - face.GetBestEdge().Vertex.Position;
xAxis = Vector3.Cross(yAxis, faceNormal);
break;
case PolyHydraEnums.UVMethods.ObjectAligned:
// Align towards the highest vertex or edge midpoint (measured in the y direction)
Vertex chosenVert = face.GetVertices().OrderBy(vert => vert.Position.y).First();
Halfedge chosenEdge = face.GetHalfedges().OrderBy(edge => edge.Midpoint.y).First();
Vector3 chosenPoint;
if (chosenVert.Position.y > chosenEdge.Midpoint.y + 0.01f) // favour edges slightly
{
chosenPoint = chosenVert.Position;
}
else
{
chosenPoint = chosenEdge.Midpoint;
}
yAxis = face.Centroid - chosenPoint;
xAxis = Vector3.Cross(yAxis, faceNormal);
break;
}
Color32 color = CalcFaceColor(conway, colors, colorMethod, i);
float faceScale = 0;
foreach (var v in face.GetVertices())
{
faceScale += Vector3.Distance(v.Position, faceCentroid);
}
faceScale /= face.Sides;
var miscUV1 = new Vector4(faceScale, face.Sides, faceCentroid.magnitude, ((float)i) / faceIndices.Length);
var miscUV2 = new Vector4(faceCentroid.x, faceCentroid.y, faceCentroid.z, i);
var faceTris = new List <int>();
if (face.Sides > 3)
{
for (var edgeIndex = 0; edgeIndex < faceIndex.Count; edgeIndex++)
{
meshVertices.Add(faceCentroid);
meshUVs.Add(calcUV(meshVertices[index], xAxis, yAxis));
faceTris.Add(index++);
edgeUVs.Add(new Vector2(0, 0));
barycentricUVs.Add(new Vector3(0, 0, 1));
meshVertices.Add(points[faceIndex[edgeIndex]]);
meshUVs.Add(calcUV(meshVertices[index], xAxis, yAxis));
faceTris.Add(index++);
edgeUVs.Add(new Vector2(1, 1));
barycentricUVs.Add(new Vector3(0, 1, 0));
meshVertices.Add(points[faceIndex[(edgeIndex + 1) % face.Sides]]);
meshUVs.Add(calcUV(meshVertices[index], xAxis, yAxis));
faceTris.Add(index++);
edgeUVs.Add(new Vector2(1, 1));
barycentricUVs.Add(new Vector3(1, 0, 0));
meshNormals.AddRange(Enumerable.Repeat(faceNormal, 3));
meshColors.AddRange(Enumerable.Repeat(color, 3));
miscUVs1.AddRange(Enumerable.Repeat(miscUV1, 3));
miscUVs2.AddRange(Enumerable.Repeat(miscUV2, 3));
}
}
else
{
meshVertices.Add(points[faceIndex[0]]);
meshUVs.Add(calcUV(meshVertices[index], xAxis, yAxis));
faceTris.Add(index++);
barycentricUVs.Add(new Vector3(0, 0, 1));
meshVertices.Add(points[faceIndex[1]]);
meshUVs.Add(calcUV(meshVertices[index], xAxis, yAxis));
faceTris.Add(index++);
barycentricUVs.Add(new Vector3(0, 1, 0));
meshVertices.Add(points[faceIndex[2]]);
meshUVs.Add(calcUV(meshVertices[index], xAxis, yAxis));
faceTris.Add(index++);
barycentricUVs.Add(new Vector3(1, 0, 0));
edgeUVs.AddRange(Enumerable.Repeat(new Vector2(1, 1), 3));
meshNormals.AddRange(Enumerable.Repeat(faceNormal, 3));
meshColors.AddRange(Enumerable.Repeat(color, 3));
miscUVs1.AddRange(Enumerable.Repeat(miscUV1, 3));
miscUVs2.AddRange(Enumerable.Repeat(miscUV2, 3));
}
if (generateSubmeshes)
{
switch (colorMethod)
{
case PolyHydraEnums.ColorMethods.ByRole:
int uniqueRoleIndex = uniqueRoles.IndexOf(faceRole);
submeshTriangles[uniqueRoleIndex].AddRange(faceTris);
break;
case PolyHydraEnums.ColorMethods.BySides:
submeshTriangles[face.Sides].AddRange(faceTris);
break;
case PolyHydraEnums.ColorMethods.ByFaceDirection:
submeshTriangles[CalcDirectionIndex(face, colors.Length - 1)].AddRange(faceTris);
break;
case PolyHydraEnums.ColorMethods.ByTags:
if (conway.FaceTags[i].Count > 0)
{
string htmlColor = conway.FaceTags[i].First(t => t.Item1.StartsWith("#")).Item1;
int uniqueTagIndex = uniqueTags.IndexOf(htmlColor);
submeshTriangles[uniqueTagIndex + 1].AddRange(faceTris);
}
else
{
submeshTriangles[0].AddRange(faceTris);
}
break;
}
}
else
{
meshTriangles.AddRange(faceTris);
}
}
target.vertices = meshVertices.Select(x => Jitter(x)).ToArray();
target.normals = meshNormals.ToArray();
if (generateSubmeshes)
{
target.subMeshCount = submeshTriangles.Count;
for (var i = 0; i < submeshTriangles.Count; i++)
{
target.SetTriangles(submeshTriangles[i], i);
}
}
else
{
target.triangles = meshTriangles.ToArray();
}
target.colors32 = meshColors.ToArray();
target.SetUVs(0, meshUVs);
target.SetUVs(1, edgeUVs);
target.SetUVs(2, barycentricUVs);
target.SetUVs(3, miscUVs1);
target.SetUVs(4, miscUVs2);
target.RecalculateTangents();
return(target);
}
