public void ComputeSpringForces()
{
ClothNode p1node = P1.GetComponent <ClothNode>();
ClothNode p2node = P2.GetComponent <ClothNode>();
Vector3 displacement = P2.transform.position - P1.transform.position;
float distance = displacement.magnitude;
Vector3 direction = displacement / distance;
// 1 Dimension velocities b/c a spring exists in 1 Dimension // Used in Dampen Force formula
float node1Velocity = Vector3.Dot(displacement.normalized, p1node.velocity);
float node2Velocity = Vector3.Dot(displacement.normalized, p2node.velocity);
// Spring Force = -spring factor * (distance - rest length)
float Fspring = -springConstant * (distance - restLength);
// Dampen Force = -Dampen Factor * (difference of velocity)
float Fdampen = -damperConstant * (node2Velocity - node1Velocity);
// 1 Dimension Spring Dampen Force // Sum of Spring Force and Dampen Force
float SpringDampenforce = Fspring + Fdampen;
// Converting it back into a 3 Dimensional force
Vector3 p2force = SpringDampenforce * direction;
Vector3 p1force = -p2force;
// Applying it to nodes
p1node.force += p1force;
p2node.force += p2force;
}
public void ComputeTriangleForces(Vector3 air_Velocity, float density, float drag)
{
ClothNode a = nodeA.GetComponent <ClothNode>();
ClothNode b = nodeB.GetComponent <ClothNode>();
ClothNode c = nodeC.GetComponent <ClothNode>();
Vector3 triangleVelocity = (a.velocity + b.velocity + c.velocity) / 3;
triangleVelocity -= air_Velocity;
Vector3 p1 = a.transform.position;
Vector3 p2 = b.transform.position;
Vector3 p3 = c.transform.position;
Vector3 r2r1crossr3r1 = Vector3.Cross((p1 - p2), (p3 - p2));
Vector3 normal = r2r1crossr3r1 / r2r1crossr3r1.magnitude;
float area = (0.5f * Vector3.Dot(triangleVelocity, normal) * triangleVelocity.magnitude) / r2r1crossr3r1.magnitude;
Vector3 forceAero = -0.5f * drag * density * area * r2r1crossr3r1;
forceAero /= 3.0f;
if (!a.TouchingFloor())
{
a.force += forceAero;
}
if (!b.TouchingFloor())
{
b.force += forceAero;
}
if (!c.TouchingFloor())
{
c.force += forceAero;
}
}
void Start()
{
nodes = new ClothNode[row * col];
vert = new Vector3[row * col];
uv = new Vector2[row * col];
tris = new int[(row - 1) * (col - 1) * 2 * 3];
for (int i = 0; i < row; ++i)
{
for (int j = 0; j < col; ++j)
{
Vector3 initPos = new Vector3(j, -i, 0) / 10;
vert[i * col + j] = initPos;
var node = new ClothNode();
node.r_prev = initPos;
node.r_now = initPos;
nodes[i * col + j] = node;
node.isStatic = (i == 0);
uv[i * col + j] = new Vector2(map(j, 0, (col - 1), 0, 1), map(-i, 0, -(row - 1), 1, 0));
}
}
gameObject.AddComponent <MeshRenderer>().material = mat;
var meshFilter = gameObject.AddComponent <MeshFilter>();
mesh = meshFilter.mesh;
UpdateMesh();
}
public void Parse(Stream input)
{
using (BinaryReader reader = new BinaryReader(input)) {
Header = reader.Read <ClothHeader>();
if (Header.Offset > 0)
{
reader.BaseStream.Position = Header.Offset;
Descriptors = new ClothDesc[Header.Count];
Nodes = new ClothNode[Header.Count][];
NodeBones = new Dictionary <int, short> [Header.Count];
for (ulong i = 0; i < Header.Count; i++)
{
Descriptors[i] = reader.Read <ClothDesc>();
long nextStartPos = reader.BaseStream.Position;
if (Descriptors[i].Section8Offset != 4574069944263674675) // todo: wtf
{
reader.BaseStream.Position = Descriptors[i].Section8Offset;
NodeBones[i] = new Dictionary <int, short>();
for (int nodeIndex = 0; nodeIndex < Descriptors[i].DriverNodeCount; nodeIndex++)
{
NodeBones[i][nodeIndex] = reader.ReadInt16();
}
}
if (Descriptors[i].Section1Offset > 0 && Descriptors[i].Section1Offset != 4692750811720056850) // todo: wtf2
{
Nodes[i] = new ClothNode[Descriptors[i].DriverNodeCount];
reader.BaseStream.Position = Descriptors[i].Section1Offset;
for (int nodeIndex = 0; nodeIndex < Descriptors[i].DriverNodeCount; nodeIndex++)
{
Nodes[i][nodeIndex] = new ClothNode(reader);
}
}
reader.BaseStream.Position = nextStartPos;
}
}
}
}
public void Parse(Stream input)
{
using (BinaryReader reader = new BinaryReader(input, Encoding.UTF8, true)) {
Header = reader.Read <HeaderInfo>();
if (Header.descCount > 0)
{
Descriptors = new ClothDesc[Header.descCount];
input.Position = Header.descOffset;
Nodes = new ClothNode[Header.descCount][];
BoneMap = new Dictionary <int, int> [Header.descCount];
NodeBones = new Dictionary <int, short> [Header.descCount];
for (ulong i = 0; i < Header.descCount; ++i)
{
Descriptors[i] = reader.Read <ClothDesc>();
long afterpos = reader.BaseStream.Position;
if (Descriptors[i].section8Offset != 4574069944263674675)
{
reader.BaseStream.Position = Descriptors[i].section8Offset;
NodeBones[i] = new Dictionary <int, short>();
for (int nodeIndex = 0; nodeIndex < Descriptors[i].driverNodeCount; nodeIndex++)
{
NodeBones[i][nodeIndex] = reader.ReadInt16();
}
}
Nodes[i] = new ClothNode[Descriptors[i].driverNodeCount];
reader.BaseStream.Position = Descriptors[i].section1Offset;
for (int nodeIndex = 0; nodeIndex < Descriptors[i].driverNodeCount; nodeIndex++)
{
long nodeStart = reader.BaseStream.Position;
float x = reader.ReadSingle();
float y = reader.ReadSingle();
float z = reader.ReadSingle();
uint zero = reader.ReadUInt32(); // zero
float x2 = reader.ReadSingle();
float y2 = reader.ReadSingle();
float z2 = reader.ReadSingle();
if (zero != 0)
{
throw new InvalidDataException($"HTLC: zero != 0 ({zero})");
}
if (Math.Abs(x - x2) > 0.01 || Math.Abs(y - y2) > 0.01 || Math.Abs(z - z2) > 0.01)
{
throw new InvalidDataException($"HTLC: location is different: {x}:{x2} {y}:{y2} {z}:{z2}");
}
reader.BaseStream.Position = nodeStart + 0x15c;
short ind1 = reader.ReadInt16();
short ind2 = reader.ReadInt16();
short ind3 = reader.ReadInt16();
short ind4 = reader.ReadInt16();
reader.BaseStream.Position = nodeStart + 0x170;
float weight1 = reader.ReadSingle();
float weight2 = reader.ReadSingle();
float weight3 = reader.ReadSingle();
float weight4 = reader.ReadSingle();
reader.BaseStream.Position = nodeStart + 0x140;
float verticalParentStrength1 = reader.ReadSingle();
reader.BaseStream.Position = nodeStart + 0x148;
float verticalParentStrength2 = reader.ReadSingle();
reader.BaseStream.Position = nodeStart + 0x154;
float diagonalParentStrength = reader.ReadSingle();
reader.BaseStream.Position = nodeStart + 0x14c;
short verticalParent = reader.ReadInt16();
reader.BaseStream.Position = nodeStart + 0x158;
short diagonalParent = reader.ReadInt16();
reader.BaseStream.Position = nodeStart + 0x150;
short chainNumber = reader.ReadInt16();
reader.BaseStream.Position = nodeStart + 0x15a;
byte isChild = reader.ReadByte();
if (isChild == 1 && chainNumber == -1)
{
throw new InvalidDataException("HTLC: node is child but not in a chain");
}
reader.BaseStream.Position = nodeStart + 0xC0 + 16;
Matrix3x4 ff = reader.Read <Matrix3x4B>().ToOpenTK(); // this is wrong...
reader.BaseStream.Position = nodeStart + 0x180;
Nodes[i][nodeIndex] = new ClothNode {
ID = nodeIndex, X = x, Y = y, Z = z,
ChainNumber = chainNumber, DiagonalParent = diagonalParent,
VerticalParent = verticalParent, Bones = new [] { new ClothNodeWeight(ind1, weight1),
new ClothNodeWeight(ind2, weight2), new ClothNodeWeight(ind3, weight3),
new ClothNodeWeight(ind4, weight4) }, IsChild = isChild == 1, Matrix = ff
};
}
reader.BaseStream.Position = afterpos;
}
}
}
}