private void AddPointsAndSprings(List <TriangleVertexIndices> indices, List <FPVector> vertices)
{
for (int i = 0; i < vertices.Count; i++)
{
MassPoint point = new MassPoint(sphere, this, material);
point.Position = vertices[i];
point.Mass = FP.EN1;
points.Add(point);
}
for (int i = 0; i < indices.Count; i++)
{
TriangleVertexIndices index = indices[i];
Triangle t = new Triangle(this);
t.indices = index;
triangles.Add(t);
t.boundingBox = FPBBox.SmallBox;
t.boundingBox.AddPoint(points[t.indices.I0].position);
t.boundingBox.AddPoint(points[t.indices.I1].position);
t.boundingBox.AddPoint(points[t.indices.I2].position);
t.dynamicTreeID = dynamicTree.AddProxy(ref t.boundingBox, t);
}
HashSet <Edge> edges = GetEdges(indices);
int count = 0;
foreach (Edge edge in edges)
{
Spring spring = new Spring(points[edge.Index1], points[edge.Index2]);
spring.Softness = FP.EN2; spring.BiasFactor = FP.EN1;
spring.SpringType = SpringType.EdgeSpring;
springs.Add(spring);
count++;
}
}
/// <summary>
/// Creates a 2D-Cloth. Connects Nearest Neighbours (4x, called EdgeSprings) and adds additional
/// shear/bend constraints (4xShear+4xBend).
/// </summary>
/// <param name="sizeX"></param>
/// <param name="sizeY"></param>
/// <param name="scale"></param>
public SoftBody(int sizeX, int sizeY, FP scale)
{
List <TriangleVertexIndices> indices = new List <TriangleVertexIndices>();
List <FPVector> vertices = new List <FPVector>();
for (int i = 0; i < sizeY; i++)
{
for (int e = 0; e < sizeX; e++)
{
vertices.Add(new FPVector(i, 0, e) * scale);
}
}
for (int i = 0; i < sizeX - 1; i++)
{
for (int e = 0; e < sizeY - 1; e++)
{
TriangleVertexIndices index = new TriangleVertexIndices();
{
index.I0 = (e + 0) * sizeX + i + 0;
index.I1 = (e + 0) * sizeX + i + 1;
index.I2 = (e + 1) * sizeX + i + 1;
indices.Add(index);
index.I0 = (e + 0) * sizeX + i + 0;
index.I1 = (e + 1) * sizeX + i + 1;
index.I2 = (e + 1) * sizeX + i + 0;
indices.Add(index);
}
}
}
EdgeSprings = springs.AsReadOnly();
VertexBodies = points.AsReadOnly();
Triangles = triangles.AsReadOnly();
AddPointsAndSprings(indices, vertices);
for (int i = 0; i < sizeX - 1; i++)
{
for (int e = 0; e < sizeY - 1; e++)
{
Spring spring = new Spring(points[(e + 0) * sizeX + i + 1], points[(e + 1) * sizeX + i + 0]);
spring.Softness = FP.EN2; spring.BiasFactor = FP.EN1;
springs.Add(spring);
}
}
foreach (Spring spring in springs)
{
FPVector delta = spring.body1.position - spring.body2.position;
if (delta.z != FP.Zero && delta.x != FP.Zero)
{
spring.SpringType = SpringType.ShearSpring;
}
else
{
spring.SpringType = SpringType.EdgeSpring;
}
}
for (int i = 0; i < sizeX - 2; i++)
{
for (int e = 0; e < sizeY - 2; e++)
{
Spring spring1 = new Spring(points[(e + 0) * sizeX + i + 0], points[(e + 0) * sizeX + i + 2]);
spring1.Softness = FP.EN2; spring1.BiasFactor = FP.EN1;
Spring spring2 = new Spring(points[(e + 0) * sizeX + i + 0], points[(e + 2) * sizeX + i + 0]);
spring2.Softness = FP.EN2; spring2.BiasFactor = FP.EN1;
spring1.SpringType = SpringType.BendSpring;
spring2.SpringType = SpringType.BendSpring;
springs.Add(spring1);
springs.Add(spring2);
}
}
}