public static MeshBuilder UpdateUV(this IcosahedronMeshBuilder mesh)
{
for (int i = 0; i < mesh.vertices.Count; i++)
{
var v = mesh.vertices[i];
if (v.y == 0.5f || v.y == -0.5f)
{
continue;
}
svec3 uv = (svec3)v.xzy();
vec2 textureCoordinates;
textureCoordinates.x = uv.a / (2.0f * Mathf.PI);
if (textureCoordinates.x < 0f)
{
textureCoordinates.x += 1f;
}
if ((mesh.uvs[i].x - textureCoordinates.x) > 0.5f)
{ // hehehehe
textureCoordinates.x += 1f;
}
//textureCoordinates.y = uv.i / Mathf.PI;
textureCoordinates.y = Mathf.Asin(2 * v.y) / Mathf.PI + 0.5f;
mesh.uvs[i] = textureCoordinates;
}
return(mesh);
}
public static IcosahedronMeshBuilder CreateSimple()
{
IcosahedronMeshBuilder mesh = new IcosahedronMeshBuilder(12, 20);
List <uint> vs = new List <uint>(12);
vec3 north = vec3.up / 2.0f;
vec3 south = vec3.down / 2.0f;
float vi = 90 * Mathf.Deg2Rad - Mathf.Atan(0.5f);
float da = 72 * Mathf.Deg2Rad;
svec3 sv;
vs.Add(mesh.CreateVertex(north, north));
sv = new svec3(1.0f / 2.0f, vi, 0);
for (int i = 0; i < 5; i++, sv.a += da)
{
vec3 cv = sv.ToVec3().normalized.xzy() / 2.0f;
vs.Add(mesh.CreateVertex(cv, cv));
}
sv = new svec3(1.0f / 2.0f, 180 * Mathf.Deg2Rad - vi, da / 2.0f);
for (int i = 0; i < 5; i++, sv.a += da)
{
vec3 cv = sv.ToVec3().normalized.xzy() / 2.0f;
vs.Add(mesh.CreateVertex(cv, cv));
}
vs.Add(mesh.CreateVertex(south, south));
mesh.MakeTriangle(vs[0], vs[2], vs[1]);
mesh.MakeTriangle(vs[0], vs[3], vs[2]);
mesh.MakeTriangle(vs[0], vs[4], vs[3]);
mesh.MakeTriangle(vs[0], vs[5], vs[4]);
mesh.MakeTriangle(vs[0], vs[1], vs[5]);
mesh.MakeTriangle(vs[2], vs[6], vs[1]);
mesh.MakeTriangle(vs[3], vs[7], vs[2]);
mesh.MakeTriangle(vs[4], vs[8], vs[3]);
mesh.MakeTriangle(vs[5], vs[9], vs[4]);
mesh.MakeTriangle(vs[1], vs[10], vs[5]);
mesh.MakeTriangle(vs[6], vs[2], vs[7]);
mesh.MakeTriangle(vs[7], vs[3], vs[8]);
mesh.MakeTriangle(vs[8], vs[4], vs[9]);
mesh.MakeTriangle(vs[9], vs[5], vs[10]);
mesh.MakeTriangle(vs[10], vs[1], vs[6]);
mesh.MakeTriangle(vs[11], vs[6], vs[7]);
mesh.MakeTriangle(vs[11], vs[7], vs[8]);
mesh.MakeTriangle(vs[11], vs[8], vs[9]);
mesh.MakeTriangle(vs[11], vs[9], vs[10]);
mesh.MakeTriangle(vs[11], vs[10], vs[6]);
return(mesh);
}
public static IcosahedronMeshBuilder Create()
{
IcosahedronMeshBuilder mesh = new IcosahedronMeshBuilder(22, 20);
List <uint> vs = new List <uint>(22);
List <uint> polarvs = new List <uint>();
List <uint> edgevs = new List <uint>();
List <uint> commonvs = new List <uint>();
vec3 north = vec3.up / 2.0f;
vec3 south = vec3.down / 2.0f;
float vi = 90 * Mathf.Deg2Rad - Mathf.Atan(0.5f);
float da = 72 * Mathf.Deg2Rad;
float uvx = 0, uvy = 0;
svec3 sv;
float uvdx = 1.0f / 5.0f;
uvx = uvdx / 2.0f;
for (int i = 0; i < 5; i++, uvx += uvdx)
{
vs.Add(mesh.CreateVertex(north, north, new vec2(uvx, 1.0f)));
}
uvy = 2.0f / 3.0f;
uvx = 0;
sv = new svec3(1.0f / 2.0f, vi, 0);
for (int i = 0; i < 5; i++, uvx += uvdx, sv.a += da)
{
vec3 cv = sv.ToVec3().normalized.xzy() / 2.0f;
vs.Add(mesh.CreateVertex(cv, cv, new vec2(uvx, uvy)));
}
{
vec3 cv = sv.ToVec3().normalized.xzy() / 2.0f;
vs.Add(mesh.CreateVertex(cv, cv, new vec2(uvx, uvy)));
}
uvy = 1.0f / 3.0f;
uvx = uvdx / 2.0f;
sv = new svec3(1.0f / 2.0f, 180 * Mathf.Deg2Rad - vi, da / 2.0f);
for (int i = 0; i < 5; i++, uvx += uvdx, sv.a += da)
{
vec3 cv = sv.ToVec3().normalized.xzy() / 2.0f;
vs.Add(mesh.CreateVertex(cv, cv, new vec2(uvx, uvy)));
}
{
vec3 cv = sv.ToVec3().normalized.xzy() / 2.0f;
vs.Add(mesh.CreateVertex(cv, cv, new vec2(uvx, uvy)));
}
uvx = uvdx;
for (int i = 0; i < 5; i++, uvx += uvdx)
{
vs.Add(mesh.CreateVertex(south, south, new vec2(uvx, 0.0f)));
}
mesh.MakeTriangle(vs[0], vs[6], vs[5]);
mesh.MakeTriangle(vs[1], vs[7], vs[6]);
mesh.MakeTriangle(vs[2], vs[8], vs[7]);
mesh.MakeTriangle(vs[3], vs[9], vs[8]);
mesh.MakeTriangle(vs[4], vs[10], vs[9]);
mesh.MakeTriangle(vs[6], vs[11], vs[5]);
mesh.MakeTriangle(vs[7], vs[12], vs[6]);
mesh.MakeTriangle(vs[8], vs[13], vs[7]);
mesh.MakeTriangle(vs[9], vs[14], vs[8]);
mesh.MakeTriangle(vs[10], vs[15], vs[9]);
mesh.MakeTriangle(vs[11], vs[6], vs[12]);
mesh.MakeTriangle(vs[12], vs[7], vs[13]);
mesh.MakeTriangle(vs[13], vs[8], vs[14]);
mesh.MakeTriangle(vs[14], vs[9], vs[15]);
mesh.MakeTriangle(vs[15], vs[10], vs[16]);
mesh.MakeTriangle(vs[17], vs[11], vs[12]);
mesh.MakeTriangle(vs[18], vs[12], vs[13]);
mesh.MakeTriangle(vs[19], vs[13], vs[14]);
mesh.MakeTriangle(vs[20], vs[14], vs[15]);
mesh.MakeTriangle(vs[21], vs[15], vs[16]);
return(mesh);
}
