protected override void _SimulationStep(float timestep)
{
HairStrand[] strands = this.instance.strands.cpuReference;
Vector3[] vertices = this.instance.vertices.cpuReference;
uint[] movability = this.instance.movability.cpuReference;
for (int s = 0; s < strands.Length; s++)
{
HairStrand strand = strands[s];
for (int j = strand.firstVertex + 1; j <= strand.lastVertex; j++)
{
if (!HairMovability.IsMovable(j, movability))
{
continue;
}
float nDist = this.lengths[j];
Vector3 p = vertices[j], pPrev = vertices[j - 1], pDir = (p - pPrev);
float dist = pDir.magnitude;
float distDiff = (nDist - dist);
vertices[j] = p + ((pDir / dist) * (distDiff * this.stiffness * timestep));
}
}
this.instance.vertices.SetGPUDirty();
}
public void Execute(int index)
{
HairStrand strand = this.strands[index];
quaternion rotGlobal = this.globalTransform[strand.firstVertex];
for (int j = strand.firstVertex + 1; j < strand.lastVertex - 1; j++)
{
quaternion rotGlobalWorld = math.mul(rotation, rotGlobal);
float3 p1 = vertices[j], p2 = vertices[j + 1];
float3 orgP2 = math.mul(rotGlobalWorld, this.referenceVectors[j + 1]) + p1;
float3 delta = stiffness * (orgP2 - p2);
if (HairMovability.IsMovable(j, movability))
{
p1 -= delta;
}
if (HairMovability.IsMovable(j + 1, movability))
{
p2 += delta;
}
float3 vec = (p2 - p1);
rotGlobal = math.mul(rotGlobal, quaternion.LookRotation(math.normalize(math.mul(math.inverse(rotGlobalWorld), vec)), new float3(0, 1, 0)));
vertices[j] = p1;
vertices[j + 1] = p2;
}
}
public void Execute(int i)
{
// Is hair movable?
if (HairMovability.IsMovable(i, movability))
{
bool wasModified = false;
float3 v = vertices[i];
for (int j = 0; j < colliderCount; j++)
{
// Read collider
var c = colliders[j];
// Intersection?
float3 dir = (v - c.center);
float sqMag = math.lengthsq(dir);
if (sqMag <= c.radiusSq) // if (Vector3.Distance(v, c.center) <= c.radius)
{
// Intersection! push the vertex out
float d = math.sqrt(sqMag); // dir.magnitude;
v += (dir / d) * (c.radius - d);
wasModified = true;
}
}
if (wasModified)
{
vertices[i] = v; // Sync
}
}
}
protected override void _SimulationStep(float timestep)
{
NativeArray <float3> vertices = this.instance.vertices.CpuReference;
NativeArray <uint> movability = this.instance.movability.CpuReference;
NativeArray <HairStrand> strands = this.instance.strands.CpuReference;
Matrix4x4 matrix = this.transform.localToWorldMatrix;
for (int j = 0; j < strands.Length; j++)
{
HairStrand strand = strands[j];
int target = Mathf.Min(strand.firstVertex + this.vertexRange, strand.lastVertex);
for (int i = strand.firstVertex; i <= target; i++)
{
if (!HairMovability.IsMovable(i, movability))
{
continue;
}
Vector3 iV = this.simulation.initialVertices[i], v = vertices[i];
iV = matrix.MultiplyPoint3x4(iV);
Vector3 delta = (iV - v);
vertices[i] = v + (delta * this.stiffness * timestep);
}
}
this.instance.vertices.SetGPUDirty();
}
protected override void _SimulationStep(float timestep)
{
List <CollisionSphere> colliders = ListPool <CollisionSphere> .Get();
for (int i = 0; i < this.colliders.Length; i++)
{
colliders.Add(new CollisionSphere()
{
center = this.colliders[i].transform.TransformPoint(this.colliders[i].center),
radius = this.colliders[i].radius,
radiusSq = this.colliders[i].radius * this.colliders[i].radius
});
}
int colliderCount = colliders.Count;
NativeArray <float3> vertices = this.instance.vertices.CpuReference;
NativeArray <uint> movability = this.instance.movability.CpuReference;
bool wasAnythingModified = false;
for (int i = 0; i < vertices.Length; i++)
{
// Is hair movable?
if (HairMovability.IsMovable(i, movability))
{
bool wasModified = false;
Vector3 v = vertices[i];
for (int j = 0; j < colliderCount; j++)
{
// Read collider
var c = colliders[j];
// Intersection?
Vector3 dir = (v - c.center);
float sqrMag = dir.sqrMagnitude;
if (sqrMag <= c.radiusSq) // if (Vector3.Distance(v, c.center) <= c.radius)
{
// Intersection! push the vertex out
float d = Mathf.Sqrt(sqrMag); // dir.magnitude;
v += (dir / d) * (c.radius - d);
wasModified = true;
}
}
if (wasModified)
{
vertices[i] = v; // Sync
}
wasAnythingModified |= wasModified;
}
}
if (wasAnythingModified)
{
this.instance.vertices.SetGPUDirty();
}
ListPool <CollisionSphere> .Return(colliders);
}
public void Execute(int i)
{
if (!HairMovability.IsMovable(i, movability))
{
return;
}
vertices[i] = vertices[i] + force;
}
protected override void _SimulationStep(float timestep)
{
// TODO: Damping
Matrix4x4 matrix = this.transform.localToWorldMatrix;
Matrix4x4 invPrevMatrix = this.simulation.prevFrameMatrix.inverse;
// Read vertices and strands
NativeArray <HairStrand> strands = this.instance.strands.CpuReference;
NativeArray <float3> vertices = this.instance.vertices.CpuReference;
NativeArray <uint> movability = this.instance.movability.CpuReference;
Vector3 gravity = Physics.gravity * this.gravityStrength;
HairStrand strand;
Vector3 lastFramePosWS, lastFramePosOS, posWS, newPos;
lastFramePosOS = lastFramePosWS = posWS = newPos = new Vector3();
float timestepSqr = timestep * timestep;
for (int j = 0; j < strands.Length; j++)
{
strand = strands[j];
// First vertex is immovable
vertices[strand.firstVertex] = matrix.MultiplyPoint3x4(this.simulation.initialVertices[strand.firstVertex]);
for (int i = strand.firstVertex; i <= strand.lastVertex; i++)
{
if (!HairMovability.IsMovable(i, movability))
{
continue;
}
lastFramePosWS = vertices[i];
lastFramePosOS = invPrevMatrix.MultiplyPoint3x4(lastFramePosWS);
posWS = matrix.MultiplyPoint3x4(lastFramePosOS);
// Unoptimized:
// newPos = posWS + (lastFramePosWS - posWS) + (gravity * (timestep * timestep));
// Optimized version:
newPos.x = posWS.x + (lastFramePosWS.x - posWS.x) + (gravity.x * timestepSqr);
newPos.y = posWS.y + (lastFramePosWS.y - posWS.y) + (gravity.y * timestepSqr);
newPos.z = posWS.z + (lastFramePosWS.z - posWS.z) + (gravity.z * timestepSqr);
vertices[i] = newPos;
}
}
// Set dirty
this.instance.vertices.SetGPUDirty();
}
/// <summary>
/// Initializes (reallocates and overwrites internal- ) movability data.
/// </summary>
/// <param name="movability">The mobility data to write, if null every vertex is marked as immovable.</param>
public void InitializeMovability(uint[] movability = null)
{
this.movability = HairMovability.CreateData(vertices.Length);
if (movability != null)
{
if (movability.Length != this.movability.Length)
{
throw new System.ArgumentException("Incorrect movability array size, length should be ceil(vertexCount / 32f)");
}
movability.CopyTo(this.movability, 0);
}
}
protected override void _SimulationStep(float timestep)
{
// TODO: Spherical wind zones
Vector3[] vertices = this.instance.vertices.cpuReference;
uint[] movability = this.instance.movability.cpuReference;
Vector3 f = this.windZone.transform.forward * Mathf.Abs(Mathf.Sin(Time.time) * this.windZone.windMain);
for (int i = 0; i < vertices.Length; i++)
{
if (!HairMovability.IsMovable(i, movability))
{
continue;
}
vertices[i] = vertices[i] + (f * timestep);
}
}
protected override void _SimulationStep(float timestep)
{
float stiffness = .5f * Mathf.Min(this.stiffness * timestep, .95f);
HairStrand[] strands = this.instance.strands.cpuReference;
Vector3[] vertices = this.instance.vertices.cpuReference;
uint[] movability = this.instance.movability.cpuReference;
Quaternion rotation = this.transform.rotation;
// Apply local shape constraint
for (int i = 0; i < strands.Length; i++)
{
HairStrand strand = strands[i];
Quaternion rotGlobal = this.globalTransform[strand.firstVertex];
realtimeDebug[strand.firstVertex] = rotGlobal;
for (int j = strand.firstVertex + 1; j < strand.lastVertex - 1; j++)
{
Quaternion rotGlobalWorld = rotation * rotGlobal;
Vector3 p1 = vertices[j], p2 = vertices[j + 1];
Vector3 orgP2 = rotGlobalWorld * this.referenceVectors[j + 1] + p1;
Vector3 delta = stiffness * (orgP2 - p2);
if (HairMovability.IsMovable(j, movability))
{
p1 -= delta;
}
if (HairMovability.IsMovable(j + 1, movability))
{
p2 += delta;
}
Vector3 vec = (p2 - p1);
rotGlobal = rotGlobal * Quaternion.LookRotation((Quaternion.Inverse(rotGlobalWorld) * vec).normalized);
vertices[j] = p1;
vertices[j + 1] = p2;
realtimeDebug[j] = rotGlobal;
}
realtimeDebug[strand.lastVertex] = rotGlobal;
}
this.instance.vertices.SetGPUDirty();
}
public void Execute(int index)
{
HairStrand strand = this.strands[index];
for (int j = strand.firstVertex + 1; j <= strand.lastVertex; j++)
{
if (!HairMovability.IsMovable(j, movability))
{
continue;
}
float nDist = this.lengths[j];
float3 p = vertices[j], pPrev = vertices[j - 1], pDir = (p - pPrev);
float dist = math.length(pDir);
float distDiff = (nDist - dist);
vertices[j] = p + ((pDir / dist) * (distDiff * this.stiffness * timestep));
}
}
public void Execute(int j)
{
HairStrand strand = strands[j];
int target = Mathf.Min(strand.firstVertex + this.vertexRange, strand.lastVertex);
for (int i = strand.firstVertex; i <= target; i++)
{
if (!HairMovability.IsMovable(i, movability))
{
continue;
}
float3 iV = initialVertices[i], v = vertices[i];
float4 iV4 = new float4(iV.x, iV.y, iV.z, 1);
iV = math.mul(matrix, iV4).xyz;
float3 delta = (iV - v);
vertices[i] = v + (delta * this.stiffness * timestep);
}
}
public void Execute(int index)
{
HairStrand strand = this.strands[index];
float3 lastFramePosWS, lastFramePosOS, posWS, newPos;
lastFramePosOS = lastFramePosWS = posWS = newPos = new float3();
// First vertex is immovable
float3 initialPos = initialVertices[strand.firstVertex];
vertices[strand.firstVertex] = math.mul(matrix, new float4(initialPos.x, initialPos.y, initialPos.z, 1)).xyz;
for (int i = strand.firstVertex; i <= strand.lastVertex; i++)
{
if (!HairMovability.IsMovable(i, movability))
{
continue;
}
lastFramePosWS = vertices[i];
float4 lastFramePosWS4 = new float4(lastFramePosWS.x, lastFramePosWS.y, lastFramePosWS.z, 1);
lastFramePosOS = math.mul(invPrevMatrix, lastFramePosWS4).xyz;
float4 lastFramePosOS4 = new float4(lastFramePosOS.x, lastFramePosOS.y, lastFramePosOS.z, 1);
posWS = math.mul(matrix, lastFramePosOS4).xyz;
// Unoptimized:
// newPos = posWS + (lastFramePosWS - posWS) + (gravity * (timestep * timestep));
// Optimized version:
newPos.x = posWS.x + (lastFramePosWS.x - posWS.x) + (gravity.x * timestepSqr);
newPos.y = posWS.y + (lastFramePosWS.y - posWS.y) + (gravity.y * timestepSqr);
newPos.z = posWS.z + (lastFramePosWS.z - posWS.z) + (gravity.z * timestepSqr);
vertices[i] = newPos;
}
}
public void Execute(int i)
{
// Is hair movable?
if (HairMovability.IsMovable(i, movability))
{
bool wasModified = false;
float3 v = vertices[i];
for (int j = 0; j < colliderCount; j++)
{
// Read collider
var c = colliders[j];
// Test sphere 1
float3 dir = (v - c.sphere1Pos);
float sqMag = math.lengthsq(dir);
if (sqMag <= c.radiusSq)
{
// Intersection! push the vertex out
float d = math.sqrt(sqMag);
v += (dir / d) * (c.radius - d);
wasModified = true;
}
else
{
// Test sphere 2
dir = (v - c.sphere2Pos);
sqMag = math.lengthsq(dir);
if (sqMag <= c.radiusSq)
{
// Intersection! push the vertex out
float d = math.sqrt(sqMag);
v += (dir / d) * (c.radius - d);
wasModified = true;
}
else
{
// Test cylinder
float3 d = c.sphere2Pos - c.sphere1Pos;
float3 pd = v - c.sphere1Pos;
float dot = math.dot(d, pd);
if (dot >= 0 && dot <= c.lengthSq)
{
float dist = math.lengthsq(pd) - (dot * dot / c.lengthSq);
if (dist <= c.radiusSq)
{
// Get closest point to vertex on cylinder axis
float3 dNorm = d / c.length;
float dotP = math.dot(v - c.sphere1Pos, dNorm);
float3 axisPoint = c.sphere1Pos + dNorm * dotP;
// Construct ray through vertex from axis point and get cylinder body exit point
v = axisPoint + (math.normalizesafe(v - axisPoint) * c.radius);
wasModified = true;
}
}
}
}
}
if (wasModified)
{
vertices[i] = v; // Sync
}
}
}