/// <summary>
/// Constructs a new demo.
/// </summary>
/// <param name="game">Game owning this demo.</param>
public ClothJointLatticeDemo(DemosGame game)
: base(game)
{
//Joints can also act like springs by modifying their springSettings.
//Though using a bunch of DistanceJoint objects can be slower than just applying direct spring forces,
//it is significantly more stable and allows rigid structures.
//The extra stability can make it useful for cloth-like simulations.
Entity latticePiece;
DistanceJoint distanceJoint;
int numColumns = 16;
int numRows = 16;
float xSpacing = 3.09f;
float zSpacing = 3.09f;
var lattice = new Entity[numRows,numColumns];
for (int i = 0; i < numRows; i++)
for (int j = 0; j < numColumns; j++)
{
latticePiece = new Sphere(
new Vector3(
xSpacing * i - (numRows - 1) * xSpacing / 2f,
15.58f,
2 + zSpacing * j - (numColumns - 1) * zSpacing / 2f),
.3f, 10);
latticePiece.LocalInertiaTensorInverse = new Matrix3x3();
latticePiece.Tag = "noDisplayObject"; //The joint lines are visible enough; don't add a sphere model for this sphere.
lattice[i, j] = latticePiece;
Space.Add(latticePiece);
}
//The joints composing the cloth can have their max iterations set independently from the solver iterations.
//More iterations (up to the solver's own max) will increase the quality at the cost of speed.
int clothIterations = 1;
//So while the above prevents joints from using more than 1 iteration, setting the solver's iteration limit can lower the
//rest of the solving load (collisions).
Space.Solver.IterationLimit = 2;
//Loop through the grid and set up the joints.
for (int i = 0; i < numRows; i++)
for (int j = 0; j < numColumns; j++)
{
if (i + 1 < numRows)
{
distanceJoint = new DistanceJoint(lattice[i, j], lattice[i + 1, j], lattice[i, j].Position, lattice[i + 1, j].Position);
distanceJoint.SpringSettings.Stiffness = 1000;
distanceJoint.SpringSettings.Damping = 1000;
distanceJoint.SolverSettings.MaximumIterationCount = clothIterations;
Space.Add(distanceJoint);
if (j + 1 < numColumns)
{
distanceJoint = new DistanceJoint(lattice[i, j], lattice[i + 1, j + 1], lattice[i, j].Position, lattice[i + 1, j + 1].Position);
distanceJoint.SpringSettings.Stiffness = 1000;
distanceJoint.SpringSettings.Damping = 1000;
distanceJoint.SolverSettings.MaximumIterationCount = clothIterations;
Space.Add(distanceJoint);
}
if (j - 1 >= 0)
{
distanceJoint = new DistanceJoint(lattice[i, j], lattice[i + 1, j - 1], lattice[i, j].Position, lattice[i + 1, j - 1].Position);
distanceJoint.SpringSettings.Stiffness = 1000;
distanceJoint.SpringSettings.Damping = 1000;
distanceJoint.SolverSettings.MaximumIterationCount = clothIterations;
Space.Add(distanceJoint);
}
}
if (j + 1 < numColumns)
{
distanceJoint = new DistanceJoint(lattice[i, j], lattice[i, j + 1], lattice[i, j].Position, lattice[i, j + 1].Position);
distanceJoint.SpringSettings.Stiffness = 1000;
distanceJoint.SpringSettings.Damping = 1000;
distanceJoint.SolverSettings.MaximumIterationCount = clothIterations;
Space.Add(distanceJoint);
}
}
//Add some ground.
Space.Add(new Sphere(new Vector3(0, 0, 0), 10));
Space.Add(new Box(new Vector3(0, -3.5f, 0), 80f, 1, 80f));
game.Camera.Position = new Vector3(0, 5, 25);
}
/// <summary>
/// Constructs a new demo.
/// </summary>
/// <param name="game">Game owning this demo.</param>
public EarthquakeDemo(DemosGame game)
: base(game)
{
Entity ground = new Box(new Vector3(0, 0, 0), 50f, 1f, 50f);
Space.Add(ground);
//Springs: Create a lattice of springs to hold the boxes together.
var platform = new Box(new Vector3(0, 4, 0), 18, 1, 18, 400);
platform.Material.KineticFriction = .8f;
Space.Add(platform);
//Create a big mess of DistanceJoints representing springs.
var distanceJoint = new DistanceJoint(ground, platform, new Vector3(9, .5f, -9), new Vector3(9, 3.5f, -9));
distanceJoint.SpringSettings.Stiffness = 3000;
distanceJoint.SpringSettings.Damping = 0;
Space.Add(distanceJoint);
distanceJoint = new DistanceJoint(ground, platform, new Vector3(9, .5f, -9), new Vector3(-9, 3.5f, -9));
distanceJoint.SpringSettings.Stiffness = 3000;
distanceJoint.SpringSettings.Damping = 0;
Space.Add(distanceJoint);
distanceJoint = new DistanceJoint(ground, platform, new Vector3(-9, .5f, -9), new Vector3(9, 3.5f, -9));
distanceJoint.SpringSettings.Stiffness = 3000;
distanceJoint.SpringSettings.Damping = 0;
Space.Add(distanceJoint);
distanceJoint = new DistanceJoint(ground, platform, new Vector3(-9, .5f, -9), new Vector3(-9, 3.5f, -9));
distanceJoint.SpringSettings.Stiffness = 3000;
distanceJoint.SpringSettings.Damping = 0;
Space.Add(distanceJoint);
distanceJoint = new DistanceJoint(ground, platform, new Vector3(9, .5f, 9), new Vector3(9, 3.5f, 9));
distanceJoint.SpringSettings.Stiffness = 6000;
distanceJoint.SpringSettings.Damping = 0;
Space.Add(distanceJoint);
distanceJoint = new DistanceJoint(ground, platform, new Vector3(9, .5f, 9), new Vector3(-9, 3.5f, 9));
distanceJoint.SpringSettings.Stiffness = 6000;
distanceJoint.SpringSettings.Damping = 0;
Space.Add(distanceJoint);
distanceJoint = new DistanceJoint(ground, platform, new Vector3(-9, .5f, 9), new Vector3(9, 3.5f, 9));
distanceJoint.SpringSettings.Stiffness = 6000;
distanceJoint.SpringSettings.Damping = 0;
Space.Add(distanceJoint);
distanceJoint = new DistanceJoint(ground, platform, new Vector3(-9, .5f, 9), new Vector3(-9, 3.5f, 9));
distanceJoint.SpringSettings.Stiffness = 6000;
distanceJoint.SpringSettings.Damping = 0;
Space.Add(distanceJoint);
distanceJoint = new DistanceJoint(ground, platform, new Vector3(9, .5f, -9), new Vector3(9, 3.5f, -9));
distanceJoint.SpringSettings.Stiffness = 6000;
distanceJoint.SpringSettings.Damping = 0;
Space.Add(distanceJoint);
distanceJoint = new DistanceJoint(ground, platform, new Vector3(9, .5f, -9), new Vector3(9, 3.5f, 9));
distanceJoint.SpringSettings.Stiffness = 6000;
distanceJoint.SpringSettings.Damping = 0;
Space.Add(distanceJoint);
distanceJoint = new DistanceJoint(ground, platform, new Vector3(9, .5f, 9), new Vector3(9, 3.5f, -9));
distanceJoint.SpringSettings.Stiffness = 6000;
distanceJoint.SpringSettings.Damping = 0;
Space.Add(distanceJoint);
distanceJoint = new DistanceJoint(ground, platform, new Vector3(9, .5f, 9), new Vector3(9, 3.5f, 9));
distanceJoint.SpringSettings.Stiffness = 6000;
distanceJoint.SpringSettings.Damping = 0;
Space.Add(distanceJoint);
distanceJoint = new DistanceJoint(ground, platform, new Vector3(-9, .5f, -9), new Vector3(-9, 3.5f, -9));
distanceJoint.SpringSettings.Stiffness = 6000;
distanceJoint.SpringSettings.Damping = 0;
Space.Add(distanceJoint);
distanceJoint = new DistanceJoint(ground, platform, new Vector3(-9, .5f, -9), new Vector3(-9, 3.5f, 9));
distanceJoint.SpringSettings.Stiffness = 6000;
distanceJoint.SpringSettings.Damping = 0;
Space.Add(distanceJoint);
distanceJoint = new DistanceJoint(ground, platform, new Vector3(-9, .5f, 9), new Vector3(-9, 3.5f, -9));
distanceJoint.SpringSettings.Stiffness = 6000;
distanceJoint.SpringSettings.Damping = 0;
Space.Add(distanceJoint);
distanceJoint = new DistanceJoint(ground, platform, new Vector3(-9, .5f, 9), new Vector3(-9, 3.5f, 9));
distanceJoint.SpringSettings.Stiffness = 6000;
distanceJoint.SpringSettings.Damping = 0;
Space.Add(distanceJoint);
int numBlocksTall = 10; //How many 'stories' tall.
float blockWidth = 4; //Total width/length of the tower.
float blockHeight = 1.333f;
Entity toAdd;
for (int i = 0; i < numBlocksTall; i++)
{
if (i % 2 == 0)
{
for (int j = 0; j < 3; j++)
{
toAdd =
new Box(
new Vector3(
j * blockWidth / 3 - blockWidth / 3f,
5 + blockHeight / 2 + i * blockHeight,
0),
blockWidth / 3, blockHeight, blockWidth, 3 * numBlocksTall + 1 - 2 * i);
Space.Add(toAdd);
toAdd.Material = new Material(.8f, .8f, 0);
}
}
else
{
for (int j = 0; j < 3; j++)
{
toAdd =
new Box(
new Vector3(0,
5 + blockHeight / 2 + i * blockHeight,
j * blockWidth / 3 - blockWidth / 3f),
blockWidth, blockHeight, blockWidth / 3, 3 * numBlocksTall + 1 - 2 * i);
Space.Add(toAdd);
toAdd.Material = new Material(.8f, .8f, 0);
}
}
}
game.Camera.Position = new Vector3(0, 7, 30);
}
public override void InitializeComponents()
{
Component shade;
Light shadeLight;
var toplink = new Component(Position, Quaternion.Identity, scalevec / 32.0f);
toplink.Mesh = new LPPMesh(segmentModel);
toplink.SetCollision(segmentPhys, true);
Components.Add(toplink);
Vector3 yVec = new Vector3(0.0f, scalevec.Y, 0.0f);
var lastlink = toplink;
for (int i = 0; i < numSegments; i++)
{
var link = new Component(Position - (yVec * (float)i * linklength), Quaternion.Identity, scalevec / 32.0f);
link.Mesh = new LPPMesh(segmentModel);
link.SetCollision(segmentPhys, false);
CollisionRules.AddRule(lastlink.Entity, link.Entity, CollisionRule.NoBroadPhase);
var joint = new DistanceJoint(lastlink.Entity, link.Entity, link.Position, link.Position);
joint.SpringSettings.Advanced.UseAdvancedSettings = true;
joint.SpringSettings.Advanced.ErrorReductionFactor = 0.99f;
joint.SpringSettings.Advanced.Softness = 0.1f;
Components.Add(link);
Components.Add(new DummyComponent(joint));
lastlink = link;
}
shade = new Component(Position - (yVec * ((numSegments * linklength) + 0.25f)), Quaternion.Identity, scalevec / 32.0f);
shade.Mesh = new LPPMesh(lampModel);
shadeLight = new Light();
shadeLight.LocalTransform = Matrix.CreateTranslation(yVec * -0.3f);
shadeLight.Shadow = true;
shadeLight.LightType = "BakedShadow";
shadeLight.Radius = 12.5f;
shadeLight.Intensity = 0.75f;
shadeLight.Color = lightColor;
PhysicsInfo PI = new PhysicsInfo(lampPhys);
PI.Density /= scalevec.Length() / Vector3.One.Length();
shade.SetCollision(PI, false);
shade.Lights.Add(shadeLight);
shade.Entity.Tag = new EntityTag(this, shade);
shadeLight = new Light();
shadeLight.Color = lightColor;
shadeLight.LocalTransform = Matrix.CreateTranslation(yVec);
shadeLight.Radius = 11.9f;
shadeLight.Intensity = 0.75f;
shadeLight.Shadow = false;
shade.Lights.Add(shadeLight);
shadeLight = new Light();
shadeLight.Intensity = 1.0f;
shadeLight.Radius = 0.5f;
shade.Lights.Add(shadeLight);
Components.Add(shade);
CollisionRules.AddRule(shade.Entity, lastlink.Entity, CollisionRule.NoBroadPhase);
var joint1 = new DistanceJoint(lastlink.Entity, shade.Entity, shade.Position, lastlink.Position);
joint1.SpringSettings.DampingConstant = 1000000f;
joint1.SpringSettings.StiffnessConstant = 600000f;
var angularMotor1 = new AngularMotor(lastlink.Entity, shade.Entity);
angularMotor1.Settings.MaximumForce = 50f;
Components.Add(new DummyComponent(joint1));
Components.Add(new DummyComponent(angularMotor1));
base.InitializeComponents();
}
