// Aerodynamic forces, 50x1g flyers
void InitAero()
{
const float s = 2;
const int segments = 6;
const int count = 50;
Random random = new Random();
for (int i = 0; i < count; ++i)
{
SoftBody psb = SoftBodyHelpers.CreatePatch(softBodyWorldInfo,
new Vector3(-s, 0, -s), new Vector3(+s, 0, -s),
new Vector3(-s, 0, +s), new Vector3(+s, 0, +s),
segments, segments, 0, true);
Material pm = psb.AppendMaterial();
pm.Flags -= FMaterial.DebugDraw;
psb.GenerateBendingConstraints(2, pm);
psb.Cfg.LF = 0.004f;
psb.Cfg.DG = 0.0003f;
psb.Cfg.AeroModel = AeroModel.VTwoSided;
Matrix trans = Matrix.Identity;
Vector3 ra = 0.1f * GetRandomVector(random);
Vector3 rp = 75 * GetRandomVector(random) + new Vector3(-50, 15, 0);
Quaternion rot = Quaternion.RotationYawPitchRoll(
(float)Math.PI / 8 + ra.X, (float)-Math.PI / 7 + ra.Y, ra.Z);
trans *= Matrix.RotationQuaternion(rot);
trans *= Matrix.Translation(rp);
psb.Transform(trans);
psb.TotalMass = 0.1f;
psb.AddForce(new Vector3(0, (float)random.NextDouble(), 0), 0);
SoftWorld.AddSoftBody(psb);
}
CullingEnabled = false;
}
void InitClusterCollide2()
{
for (int i = 0; i < 3; ++i)
{
SoftBody psb = SoftBodyHelpers.CreateFromTriMesh(softBodyWorldInfo, TorusMesh.Vertices, TorusMesh.Indices);
Material pm = psb.AppendMaterial();
pm.Flags -= FMaterial.DebugDraw;
psb.GenerateBendingConstraints(2, pm);
psb.Cfg.PIterations = 2;
psb.Cfg.DF = 1;
psb.Cfg.SshrCl = 1;
psb.Cfg.SSSplitCl = 0;
psb.Cfg.SkhrCl = 0.1f;
psb.Cfg.SKSplitCl = 1;
psb.Cfg.Collisions = FCollisions.CLSS | FCollisions.CLRS;
psb.RandomizeConstraints();
Matrix m = Matrix.RotationYawPitchRoll((float)Math.PI / 2 * (i & 1), (float)Math.PI / 2 * (1 - (i & 1)), 0)
* Matrix.Translation(3 * i, 2, 0);
psb.Transform(m);
psb.Scale(new Vector3(2, 2, 2));
psb.SetTotalMass(50, true);
psb.GenerateClusters(16);
SoftWorld.AddSoftBody(psb);
}
}
void InitTorusMatch()
{
SoftBody psb = SoftBodyHelpers.CreateFromTriMesh(softBodyWorldInfo, TorusMesh.Vertices, TorusMesh.Indices);
psb.Materials[0].Lst = 0.1f;
psb.Cfg.MT = 0.05f;
psb.RandomizeConstraints();
Matrix m = Matrix.RotationYawPitchRoll(0, (float)Math.PI / 2, 0) *
Matrix.Translation(0, 4, 0);
psb.Transform(m);
psb.Scale(new Vector3(2, 2, 2));
psb.SetTotalMass(50, true);
psb.SetPose(false, true);
SoftWorld.AddSoftBody(psb);
}
void InitTorus()
{
SoftBody psb = SoftBodyHelpers.CreateFromTriMesh(softBodyWorldInfo, TorusMesh.Vertices, TorusMesh.Indices);
psb.GenerateBendingConstraints(2);
psb.Cfg.PIterations = 2;
psb.RandomizeConstraints();
Matrix m = Matrix.RotationYawPitchRoll(0, (float)Math.PI / 2, 0) *
Matrix.Translation(0, 4, 0);
psb.Transform(m);
psb.Scale(new Vector3(2, 2, 2));
psb.SetTotalMass(50, true);
SoftWorld.AddSoftBody(psb);
cutting = true;
}
void Init_Aero2()
{
const float s = 5;
const int segments = 10;
const int count = 5;
Vector3 pos = new Vector3(-s * segments, 0, 0);
float gap = 0.5f;
for (int i = 0; i < count; ++i)
{
SoftBody psb = SoftBodyHelpers.CreatePatch(softBodyWorldInfo, new Vector3(-s, 0, -s * 3),
new Vector3(+s, 0, -s * 3),
new Vector3(-s, 0, +s),
new Vector3(+s, 0, +s),
segments, segments * 3,
1 + 2, true);
psb.CollisionShape.Margin = 0.5f;
Material pm = psb.AppendMaterial();
pm.Lst = 0.0004f;
pm.Flags -= FMaterial.DebugDraw;
psb.GenerateBendingConstraints(2, pm);
psb.Cfg.LF = 0.05f;
psb.Cfg.DG = 0.01f;
//psb.Cfg.LF = 0.004f;
//psb.Cfg.DG = 0.0003f;
psb.Cfg.PIterations = 2;
psb.Cfg.AeroModel = AeroModel.VTwoSidedLiftDrag;
psb.WindVelocity = new Vector3(4, -12.0f, -25.0f);
pos += new Vector3(s * 2 + gap, 0, 0);
Matrix trs = Matrix.RotationX((float)Math.PI / 2) * Matrix.Translation(pos);
psb.Transform(trs);
psb.TotalMass = 2.0f;
SoftBodyHelpers.ReoptimizeLinkOrder(psb);
SoftWorld.AddSoftBody(psb);
}
Graphics.CullingEnabled = false;
}
void InitCollide()
{
for (int i = 0; i < 3; ++i)
{
SoftBody psb = SoftBodyHelpers.CreateFromTriMesh(softBodyWorldInfo, TorusMesh.Vertices, TorusMesh.Indices);
psb.GenerateBendingConstraints(2);
psb.Cfg.PIterations = 2;
psb.Cfg.Collisions |= FCollisions.VFSS;
psb.RandomizeConstraints();
Matrix m = Matrix.RotationYawPitchRoll((float)Math.PI / 2 * (i & 1), (float)Math.PI / 2 * (1 - (i & 1)), 0) *
Matrix.Translation(3 * i, 2, 0);
psb.Transform(m);
psb.Scale(new Vector3(2, 2, 2));
psb.SetTotalMass(50, true);
SoftWorld.AddSoftBody(psb);
}
cutting = true;
}
void InitBunny()
{
SoftBody psb = SoftBodyHelpers.CreateFromTriMesh(softBodyWorldInfo, BunnyMesh.Vertices, BunnyMesh.Indices);
Material pm = psb.AppendMaterial();
pm.Lst = 0.5f;
pm.Flags -= FMaterial.DebugDraw;
psb.GenerateBendingConstraints(2, pm);
psb.Cfg.PIterations = 2;
psb.Cfg.DF = 0.5f;
psb.RandomizeConstraints();
Matrix m = Matrix.RotationYawPitchRoll(0, (float)Math.PI / 2, 0) *
Matrix.Translation(0, 4, 0);
psb.Transform(m);
psb.Scale(new Vector3(6, 6, 6));
psb.SetTotalMass(100, true);
SoftWorld.AddSoftBody(psb);
cutting = true;
}
SoftBody CreateClusterTorus(Vector3 x, Vector3 a, Vector3 s)
{
SoftBody psb = SoftBodyHelpers.CreateFromTriMesh(softBodyWorldInfo, TorusMesh.Vertices, TorusMesh.Indices);
Material pm = psb.AppendMaterial();
pm.Lst = 1;
pm.Flags -= FMaterial.DebugDraw;
psb.GenerateBendingConstraints(2, pm);
psb.Cfg.PIterations = 2;
psb.Cfg.Collisions = FCollisions.CLSS | FCollisions.CLRS;
psb.RandomizeConstraints();
psb.Scale(s);
Matrix m = Matrix.RotationYawPitchRoll(a.X, a.Y, a.Z) * Matrix.Translation(x);
psb.Transform(m);
psb.SetTotalMass(50, true);
psb.GenerateClusters(64);
SoftWorld.AddSoftBody(psb);
return(psb);
}
// Create a sequence of flag objects and add them to the world.
void CreateFlag(int width, int height, out AlignedSoftBodyArray flags)
{
flags = new AlignedSoftBodyArray();
// First create a triangle mesh to represent a flag
// Allocate a simple mesh consisting of a vertex array and a triangle index array
IndexedMesh mesh = new IndexedMesh();
mesh.NumVertices = width * height;
mesh.NumTriangles = 2 * (width - 1) * (height - 1);
Vector3Array vertexArray = new Vector3Array(mesh.NumVertices);
mesh.Vertices = vertexArray;
mesh.VertexStride = Vector3.SizeInBytes;
IntArray triangleVertexIndexArray = new IntArray(3 * mesh.NumTriangles);
mesh.TriangleIndices = triangleVertexIndexArray;
mesh.TriangleIndexStride = sizeof(int) * 3;
// Generate normalised object space vertex coordinates for a rectangular flag
Matrix defaultScale = Matrix.Scaling(5, 20, 1);
for (int y = 0; y < height; ++y)
{
float yCoordinate = y * 2.0f / (float)height - 1.0f;
for (int x = 0; x < width; ++x)
{
float xCoordinate = x * 2.0f / (float)width - 1.0f;
Vector3 vertex = new Vector3(xCoordinate, yCoordinate, 0.0f);
vertexArray[y * width + x] = Vector3.TransformCoordinate(vertex, defaultScale);
}
}
// Generate vertex indices for triangles
for (int y = 0; y < (height - 1); ++y)
{
for (int x = 0; x < (width - 1); ++x)
{
// Triangle 0
// Top left of square on mesh
{
int vertex0 = y * width + x;
int vertex1 = vertex0 + 1;
int vertex2 = vertex0 + width;
int triangleIndex = 2 * (y * (width - 1) + x);
triangleVertexIndexArray[(mesh.TriangleIndexStride * triangleIndex) / sizeof(int)] = vertex0;
triangleVertexIndexArray[(mesh.TriangleIndexStride * triangleIndex + 1) / sizeof(int) + 1] = vertex1;
triangleVertexIndexArray[(mesh.TriangleIndexStride * triangleIndex + 2) / sizeof(int) + 2] = vertex2;
}
// Triangle 1
// Bottom right of square on mesh
{
int vertex0 = y * width + x + 1;
int vertex1 = vertex0 + width;
int vertex2 = vertex1 - 1;
int triangleIndex = 2 * y * (width - 1) + 2 * x + 1;
triangleVertexIndexArray[(mesh.TriangleIndexStride * triangleIndex) / sizeof(int)] = vertex0;
triangleVertexIndexArray[(mesh.TriangleIndexStride * triangleIndex) / sizeof(int) + 1] = vertex1;
triangleVertexIndexArray[(mesh.TriangleIndexStride * triangleIndex) / sizeof(int) + 2] = vertex2;
}
}
}
Matrix defaultRotateAndScale = Matrix.RotationX(0.5f);
// Construct the sequence flags applying a slightly different translation to each one to arrange them
// appropriately in the scene.
for (int i = 0; i < numFlags; ++i)
{
float zTranslate = flagSpacing * (i - numFlags / 2);
Vector3 defaultTranslate = new Vector3(0, 20, zTranslate);
Matrix transform = defaultRotateAndScale * Matrix.Translation(defaultTranslate);
SoftBody softBody = CreateFromIndexedMesh(vertexArray, triangleVertexIndexArray, true);
for (int j = 0; j < mesh.NumVertices; ++j)
{
softBody.SetMass(j, 10.0f / mesh.NumVertices);
}
softBody.SetMass((height - 1) * width, 0);
softBody.SetMass((height - 1) * width + width - 1, 0);
softBody.SetMass((height - 1) * width + width / 2, 0);
softBody.Cfg.Collisions = FCollisions.CLSS | FCollisions.CLRS;
softBody.Cfg.LF = 0.0005f;
softBody.Cfg.VCF = 0.001f;
softBody.Cfg.DP = 0.0f;
softBody.Cfg.DG = 0.0f;
flags.Add(softBody);
softBody.Transform(transform);
SoftWorld.AddSoftBody(softBody);
}
//delete [] vertexArray;
//delete [] triangleVertexIndexArray;
}
