public void Run(HairAsset asset)
{
asset.GetRawDataCopy(out float3[] originalVertices, out HairStrand[] originalStrands, out uint[] originalMovability);
List <float3> newVertices = new List <float3>();
List <HairStrand> newStrands = new List <HairStrand>();
BitArray movability = new BitArray(originalVertices.Length * (newHairPerHair + 1));
for (int i = 0; i < originalMovability.Length; i++)
{
for (int j = 0; j < 32; j++)
{
movability[(i * 32) + j] = HairMovability.IsMovable((i * 32) + j, originalMovability);
}
}
for (int i = 0; i < originalStrands.Length; i++)
{
float rLeft = UnityEngine.Random.value * maxOffsetRadius, rUp = UnityEngine.Random.value * maxOffsetRadius;
var origStrand = originalStrands[i];
if (origStrand.lastVertex - origStrand.firstVertex < 2)
{
continue;
}
for (int j = 0; j < newHairPerHair; j++)
{
int firstVertex = newVertices.Count + originalVertices.Length;
for (int k = origStrand.firstVertex; k <= origStrand.lastVertex; k++)
{
Quaternion orientation = k == origStrand.lastVertex ? Quaternion.LookRotation(originalVertices[k] - originalVertices[k - 1]) : Quaternion.LookRotation(originalVertices[k + 1] - originalVertices[k]);
Vector3 left = orientation * Vector3.left;
Vector3 up = orientation * Vector3.up;
float3 offset = (rLeft * left) + (rUp * up);
movability[originalVertices.Length + newVertices.Count] = movability[k];
newVertices.Add(originalVertices[k] + offset);
}
newStrands.Add(new HairStrand()
{
firstVertex = firstVertex, lastVertex = newVertices.Count + originalVertices.Length - 1
});
}
}
uint[] _movability = new uint[Mathf.CeilToInt(movability.Length / 32f)];
for (int i = 0; i < movability.Length; i++)
{
HairMovability.SetMovable(i, movability[i], _movability);
}
asset.InitializeVertices(originalVertices.Concat(newVertices).ToArray());
asset.InitializeMovability(_movability);
asset.InitializeStrands(originalStrands.Concat(newStrands).ToArray());
}
public void Run(HairAsset asset)
{
List <bool> movability = new List <bool>();
List <float3> vertices = new List <float3>();
List <HairStrand> strands = new List <HairStrand>();
foreach (var mf in targetObject.GetComponentsInChildren <MeshFilter>())
{
var t = mf.transform;
var mesh = mf.sharedMesh;
if (mesh == null)
{
continue;
}
var meshTriangles = mesh.triangles;
var meshVertices = mesh.vertices;
var meshNormals = mesh.normals;
for (int i = 0; i < meshTriangles.Length; i += 3)
{
int i1 = meshTriangles[i], i2 = meshTriangles[i + 1], i3 = meshTriangles[i + 2];
Vector3 p1 = meshVertices[i1], p2 = meshVertices[i2], p3 = meshVertices[i3];
Vector3 n1 = t.TransformDirection(meshNormals[i1]), n2 = t.TransformDirection(meshNormals[i2]), n3 = t.TransformDirection(meshNormals[i3]);
var faceNormal = (n1 + n2 + n3) / 3f;
if (Vector3.Dot(faceNormal, growingDirection) >= growingDirMinAngle)
{
float triangleSurfaceArea = Vector3.Cross(p2 - p1, p3 - p1).magnitude;
int stalks = Mathf.FloorToInt(triangleSurfaceArea * stalksPerSquareUnit);
for (int k = 0; k < stalks; k++)
{
float r1 = UnityEngine.Random.value, r2 = UnityEngine.Random.value;
var p = (1f - Mathf.Sqrt(r1)) * p1 + (Mathf.Sqrt(r1) * (1f - r2)) * p2 + (r2 * Mathf.Sqrt(r1)) * p3;
int startIdx = vertices.Count;
movability.Add(false);
vertices.Add(p);
float height = UnityEngine.Random.Range(heightMin, heightMax);
float heightPerVertex = height / (verticesPerStalk - 1);
for (int j = 1; j < verticesPerStalk; j++)
{
movability.Add(true);
vertices.Add(p + (faceNormal * (heightPerVertex * (float)j)));
}
strands.Add(new HairStrand()
{
firstVertex = startIdx,
lastVertex = vertices.Count - 1
});
}
}
}
}
asset.InitializeStrands(strands.ToArray());
asset.InitializeVertices(vertices.ToArray());
uint[] u_movability = new uint[Mathf.CeilToInt(movability.Count / 32f)];
for (int i = 0; i < movability.Count; i++)
{
HairMovability.SetMovable(i, movability[i], u_movability);
}
asset.InitializeMovability(u_movability);
}