public static VertexGrid CreateGrid(int rows, int columns)
{
int numVertsX = rows + 1;
int numVertsZ = columns + 1;
VertexGrid grid = new VertexGrid(new Vector3[numVertsX * numVertsZ], new int[rows * columns * 2 * 3]);
{
for (int r = 0; r < numVertsX; r++)
{
for (int c = 0; c < numVertsZ; c++)
{
grid.Points[r * numVertsZ + c] = new Vector3(r, 0, c);
}
}
}
{
int count = 0;
int vi = 0;
for (int z = 0; z < columns; z++)
{
for (int x = 0; x < rows; x++)
{
// First triangle
grid.Indices[count++] = vi;
grid.Indices[count++] = vi + 1;
grid.Indices[count++] = vi + numVertsX;
// Second triangle
grid.Indices[count++] = vi + numVertsX;
grid.Indices[count++] = vi + 1;
grid.Indices[count++] = vi + numVertsX + 1;
vi++;
}
vi++;
}
}
return grid;
}
public static VertexGrid CreateGrid(int rows, int columns)
{
int numVertsX = rows + 1;
int numVertsZ = columns + 1;
VertexGrid grid = new VertexGrid(new Vector3[numVertsX * numVertsZ], new int[rows * columns * 2 * 3]);
{
for (int r = 0; r < numVertsX; r++)
{
for (int c = 0; c < numVertsZ; c++)
{
grid.Points[r * numVertsZ + c] = new Vector3(r, 0, c);
}
}
}
{
int count = 0;
int vIndex = 0;
for (int z = 0; z < columns; z++)
{
for (int x = 0; x < rows; x++)
{
// first triangle
grid.Indices[count++] = vIndex;
grid.Indices[count++] = vIndex + 1;
grid.Indices[count++] = vIndex + numVertsX;
// second triangle
grid.Indices[count++] = vIndex + numVertsX;
grid.Indices[count++] = vIndex + 1;
grid.Indices[count++] = vIndex + numVertsX + 1;
vIndex++;
}
vIndex++;
}
}
return(grid);
}
protected override void LoadPhysics(Scene scene)
{
int w = 25;
int h = 25;
float hw = w / 2.0f;
float hh = h / 2.0f;
Vector3 p = new Vector3(0, 20, 0);
// Create a Grid of Points
int vertices, indices;
ClothMesh clothMesh;
{
var grid = VertexGrid.CreateGrid(w, h);
vertices = grid.Points.Length;
indices = grid.Indices.Length;
ClothMeshDescription clothMeshDesc = new ClothMeshDescription();
clothMeshDesc.AllocateVertices <Vector3>(vertices);
clothMeshDesc.AllocateTriangles <int>(indices / 3);
clothMeshDesc.VertexCount = vertices;
clothMeshDesc.TriangleCount = indices / 3;
clothMeshDesc.VerticesStream.SetData(grid.Points);
clothMeshDesc.TriangleStream.SetData(grid.Indices);
// We are using 32 bit integers for our indices, so make sure the 16 bit flag is removed.
// 32 bits are the default, so this isn't technically needed, but it's good to show in a sample
clothMeshDesc.Flags &= ~MeshFlag.Indices16Bit;
clothMeshDesc.Flags |= (MeshFlag)((int)clothMeshDesc.Flags | (int)ClothMeshFlag.Tearable);
// Write the cooked data to memory
using (var memoryStream = new MemoryStream())
{
Cooking.InitializeCooking();
Cooking.CookClothMesh(clothMeshDesc, memoryStream);
Cooking.CloseCooking();
// Need to reset the position of the stream to the beginning
memoryStream.Position = 0;
clothMesh = Engine.Core.CreateClothMesh(memoryStream);
}
}
//
int j = vertices * 2;
int k = indices * 3;
var clothDesc = new ClothDescription()
{
ClothMesh = clothMesh,
GlobalPose =
Matrix.Translation(-hw, 0, -hh) *
Matrix.Translation(p),
Flags = ClothFlag.Gravity | ClothFlag.Bending | ClothFlag.CollisionTwoway | ClothFlag.Visualization | ClothFlag.Tearable,
BendingStiffness = 0.1f,
TearFactor = 1.5f
};
clothDesc.MeshData.AllocatePositions <Vector3>(j);
clothDesc.MeshData.AllocateIndices <int>(k);
clothDesc.MeshData.AllocateNormals <Vector3>(j);
clothDesc.MeshData.MaximumVertices = j;
clothDesc.MeshData.MaximumIndices = k;
clothDesc.MeshData.NumberOfVertices = vertices;
clothDesc.MeshData.NumberOfIndices = indices;
_cloth = scene.CreateCloth(clothDesc);
//
// Four corner boxes to hold it in place
var positions = new[]
{
new Vector3(0, 0, -hh), // Back
new Vector3(0, 0, hh), // Front
new Vector3(-hw, 0, 0), // Left
new Vector3(hw, 0, 0), // Right
};
var sizes = new[]
{
new Vector3(w, 1, 1), // Back
new Vector3(w, 1, 1), // Front
new Vector3(1, 1, h), // Left
new Vector3(1, 1, h), //Right
};
for (int i = 0; i < 4; i++)
{
var actorDesc = new ActorDescription()
{
GlobalPose = Matrix.Translation(positions[i] + p),
Shapes = { new BoxShapeDescription(sizes[i]) }
};
var actor = scene.CreateActor(actorDesc);
_cloth.AttachToShape(actor.Shapes.First(), (ClothAttachmentFlag)0);
}
//
// Something to drop on it
{
var actorDesc = new ActorDescription()
{
GlobalPose = Matrix.Translation(0, 100, 0),
Shapes = { new SphereShapeDescription(2) },
BodyDescription = new BodyDescription(50)
};
var actor = scene.CreateActor(actorDesc);
}
}
public static PhysX.Cloth FlagOfCloth(Scene scene)
{
Core core = scene.Core;
// Create a Grid of Points
VertexGrid grid = VertexGrid.CreateGrid(10, 10);
ClothMeshDescription clothMeshDesc = new ClothMeshDescription();
clothMeshDesc.AllocateVertices <Vector3>(grid.Points.Length);
clothMeshDesc.AllocateTriangles <int>(grid.Indices.Length / 3);
clothMeshDesc.VertexCount = grid.Points.Length;
clothMeshDesc.TriangleCount = grid.Indices.Length / 3;
clothMeshDesc.VerticesStream.SetData(grid.Points);
clothMeshDesc.TriangleStream.SetData(grid.Indices);
// We are using 32 bit integers, so make sure the 16 bit flag is removed.
// 32 bits are the default, so this isn't technically needed
clothMeshDesc.Flags &= ~MeshFlag.Indices16Bit;
// Write the cooked data to memory
MemoryStream memoryStream = new MemoryStream();
Cooking.InitializeCooking();
Cooking.CookClothMesh(clothMeshDesc, memoryStream);
Cooking.CloseCooking();
// Need to reset the position of the stream to the beginning
memoryStream.Position = 0;
ClothMesh clothMesh = core.CreateClothMesh(memoryStream);
//
ClothDescription clothDesc = new ClothDescription()
{
ClothMesh = clothMesh,
Flags = ClothFlag.Gravity | ClothFlag.Bending | ClothFlag.CollisionTwoway | ClothFlag.Visualization,
GlobalPose =
Matrix.RotationYawPitchRoll(0, (float)Math.PI / 2.0f, (float)Math.PI / 2.0f) *
Matrix.Translation(0, 20, 0)
};
clothDesc.MeshData.AllocatePositions <Vector3>(grid.Points.Length);
clothDesc.MeshData.AllocateIndices <int>(grid.Indices.Length);
clothDesc.MeshData.MaximumVertices = grid.Points.Length;
clothDesc.MeshData.MaximumIndices = grid.Indices.Length;
clothDesc.MeshData.NumberOfVertices = grid.Points.Length;
clothDesc.MeshData.NumberOfIndices = grid.Indices.Length;
var flag = scene.CreateCloth(clothDesc);
// Flag Pole
ActorDescription flagPoleActorDesc = new ActorDescription()
{
GlobalPose = Matrix.Translation(0, 10, 0),
Shapes = { new BoxShapeDescription(1.0f, 20.0f, 1.0f) }
};
Actor flagPoleActor = scene.CreateActor(flagPoleActorDesc);
flag.AttachToShape(flagPoleActor.Shapes[0], 0);
flag.WindAcceleration = new Vector3(10, 10, 10);
flag.BendingStiffness = 0.1f;
return(flag);
}
