public ClothSim(Game game, TexturedPlane clothPlane, float clothMass,
float structStiffness, float structDamping,
float shearStiffness, float shearDamping,
float bendStiffness, float bendDamping)
: base(game)
{
this.clothPlane = clothPlane;
//create sim data
CreateSimVertices(clothPlane, clothMass);
//connect springs and add constraints
ConnectSprings(structStiffness, structDamping,
shearStiffness, shearDamping,
bendStiffness, bendDamping);
}
private void InitClothScene()
{
//cloth attributes
int length = 10;
int width = 5;
int lengthSegments = 20;
int widthSegments = 15;
//load in a plane
clothPlane = new TexturedPlane(this, length, width, lengthSegments, widthSegments, @"checkerboard");
clothPlane.Initialize();
//create a cloth sim
float clothMass = 2.0f;
float structStiffness = 2.0f;
float structDamping = 0.02f;
float shearStiffness = 2.0f;
float shearDamping = 0.02f;
float bendStiffness = 2.0f;
float bendDamping = 0.02f;
clothSim = new ClothSim(this, clothPlane, clothMass, structStiffness, structDamping, shearStiffness, shearDamping, bendStiffness, bendDamping);
clothSim.ConstraintIterations = 10;
//add in a global forceGenerators: gravity
Gravity gravity = new Gravity(new Vector3(0, -9.81f, 0));
clothSim.AddGlobalForceGenerator(gravity);
//constrain the two top corners of the cloth so that we can control it
topLeftCorner = new PointConstraint(clothSim.SimVertices[0].CurrPosition, clothSim.SimVertices[0]);
clothSim.Constraints.Add(topLeftCorner);
topRightCorner = new PointConstraint(clothSim.SimVertices[lengthSegments].CurrPosition, clothSim.SimVertices[lengthSegments]);
clothSim.Constraints.Add(topRightCorner);
//create an integrator and assign it to the sim
float drag = 0.01f;
Integrator integrator = new VerletNoVelocityIntegrator(this, drag);
clothSim.Integrator = integrator;
}
private void CreateSimVertices(TexturedPlane clothPlane, float clothMass)
{
int numVertices = clothPlane.NumVertices;
float vertexMass = clothMass / numVertices;
simVertices = new SimVertex[numVertices];
for (int i = 0; i < numVertices; i++)
{
simVertices[i] = new SimVertex(vertexMass, SimObjectType.ACTIVE, i, clothPlane);
this.AddSimObject(simVertices[i]);
}
}