public void GenerateCrystal()
{
//Debug.Log("Generating crystal");
List <Vector3> vertices = new List <Vector3>();
List <Vector3> normals = new List <Vector3>();
List <int> tris = new List <int>();
for (int lobe = 0; lobe < numCrystals; lobe++)
{
// compute lobe parameters given randomness
int lobeNumCenters = Mathf.Max(1, (int)(numCenters - randomness * numCenters * NextRandomFloat));
int lobeNumSides = Mathf.Max(MinNumSides, (int)(numCenters - randomness * numCenters * NextRandomFloat));
float lobeScale = 1f - 0.75f * randomness * NextRandomFloat; // limit maximum randomness on scale
float lobeWidth = lobeScale * crystalWidth * (1f - randomness + 2f * randomness * NextRandomFloat);
float lobeLength = lobeScale * crystalLength * (1f - randomness + 2f * randomness * NextRandomFloat);
float maxRotation = 2f * Mathf.PI / lobeNumSides;
Vector3 lobeRoot = 0.25f * randomness * new Vector3(-1f + 2f * NextRandomFloat, 0, -1f + 2f * NextRandomFloat);
//Debug.Log("Generating a crystal lobe " + lobe);
Vector3 lobeDir = Samplers.sampleRandomCosineHemisphere(NextRandomFloat, NextRandomFloat);
Quaternion rotation = Quaternion.LookRotation(lobeDir);
List <Vector3> sides = new List <Vector3>();
for (int j = 0; j < lobeNumCenters; j++)
{
float ratio = lobeNumCenters == 1 ? 0.5f: 1f * j / (lobeNumCenters - 1);
Vector3 centerPos = lobeRoot + lobeLength * lobeDir * evaluateDensityCurve(ratio);
for (int side = 0; side < lobeNumSides; side++)
{
float angle = maxRotation * side;
Vector3 sideDir = new Vector3(Mathf.Cos(angle), 0, Mathf.Sin(angle));
//todo rotate to crystalDir
Vector3 sidePos = centerPos + lobeWidth * sideDir * crystalSizeCurve.Evaluate(ratio);
//sidePos = rotation * sidePos;
sides.Add(sidePos);
}
}
Vector3 crystalTop = lobeRoot + lobeLength * lobeDir;
//Debug.Log("ROOT: " + lobeRoot);
//Debug.Log("SIDES: " + sides.Count);
//foreach (var v in sides)
// Debug.Log(v);
//Debug.Log("TOP: " + crystalTop);
int index, s1, s2, s3;
// generate triangles for the sides
for (int j = 0; j < lobeNumCenters - 1; j++)
{
for (int side = 0; side < lobeNumSides; side++)
{
index = j * lobeNumSides + side;
s1 = index;
bool b = (side + 1) % lobeNumSides == 0;
// need to generate 2 triangles per side
for (int tri = 0; tri < 2; tri++)
{
if (tri == 0) // triangle 1
{
s2 = b ? index + lobeNumSides : index + lobeNumSides;
s3 = b ? index + 1 : index + lobeNumSides + 1;
}
else // triangle 2
{
s2 = b ? index + 1 : index + lobeNumSides + 1;
s3 = b ? index - lobeNumSides + 1 : index + 1;
}
//Debug.Log("Indices" + s1 + " " + s2 + " " + s3);
List <Vector3> verticesLocal = new List <Vector3>()
{
sides[s1], sides[s2], sides[s3]
};
MeshTriAdder.addTriangle(new Vector3Int(0, 1, 2), verticesLocal, vertices, tris, false);
}
}
}
bool isBottom = true;
Vector3 v1;
// bottom and top triangles
for (int c = 0; c < 2; c++)
{
if (isBottom)
{
v1 = lobeRoot;
index = 0; // index is now used as an offset for the vertex indices
}
else
{
v1 = crystalTop;
index = (lobeNumCenters - 1) * lobeNumSides;
}
for (int j = 0; j < lobeNumSides; j++)
{
if (isBottom)
{
s2 = index + j;
s3 = (index + 1 + j) % lobeNumSides;
}
else
{
s2 = index + (1 + j) % lobeNumSides;
s3 = index + j;
}
List <Vector3> verticesLocal = new List <Vector3>()
{
v1, sides[s2], sides[s3]
};
MeshTriAdder.addTriangle(new Vector3Int(0, 1, 2), verticesLocal, vertices, tris, false);
}
isBottom = false;
}
}
Mesh mesh = new Mesh();
mesh.Clear();
mesh.subMeshCount = 2;
mesh.SetVertices(vertices);
mesh.SetTriangles(tris.ToArray(), 0);
Vector2[] uvs = Unwrapping.GeneratePerTriangleUV(mesh);
mesh.SetUVs(0, new List <Vector2>(uvs));
mesh.RecalculateNormals();
mesh.RecalculateBounds();
// assign back to meshFilter
MeshFilter meshFilter = GetComponent <MeshFilter>();
//mesh.Optimize();
meshFilter.mesh = mesh;
}