/// <summary>
/// Helper Method to get the vertex and index List from the model.
/// </summary>
/// <param name="vertices"></param>
/// <param name="indices"></param>
/// <param name="model"></param>
public void ExtractData(List<Vector3> vertices, List<TriangleVertexIndices> indices, Model model)
{
Matrix[] bones_ = new Matrix[model.Bones.Count];
model.CopyAbsoluteBoneTransformsTo(bones_);
foreach (ModelMesh mm in model.Meshes)
{
Matrix xform = bones_[mm.ParentBone.Index];
foreach (ModelMeshPart mmp in mm.MeshParts)
{
int offset = vertices.Count;
Vector3[] a = new Vector3[mmp.NumVertices];
mmp.VertexBuffer.GetData<Vector3>(mmp.VertexOffset * mmp.VertexBuffer.VertexDeclaration.VertexStride,
a, 0, mmp.NumVertices, mmp.VertexBuffer.VertexDeclaration.VertexStride);
for (int i = 0; i != a.Length; ++i)
Vector3.Transform(ref a[i], ref xform, out a[i]);
vertices.AddRange(a);
if (mmp.IndexBuffer.IndexElementSize != IndexElementSize.SixteenBits)
throw new Exception(
String.Format("Model uses 32-bit indices, which are not supported."));
short[] s = new short[mmp.PrimitiveCount * 3];
mmp.IndexBuffer.GetData<short>(mmp.StartIndex * 2, s, 0, mmp.PrimitiveCount * 3);
TriangleVertexIndices[] tvi = new TriangleVertexIndices[mmp.PrimitiveCount];
for (int i = 0; i != tvi.Length; ++i)
{
tvi[i].I0 = s[i * 3 + 0] + offset;
tvi[i].I1 = s[i * 3 + 1] + offset;
tvi[i].I2 = s[i * 3 + 2] + offset;
}
indices.AddRange(tvi);
}
}
}
/// <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, float scale)
{
List<TriangleVertexIndices> indices = new List<TriangleVertexIndices>();
List<JVector> vertices = new List<JVector>();
for (int i = 0; i < sizeY; i++)
{
for (int e = 0; e < sizeX; e++)
{
vertices.Add(new JVector(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 = new ReadOnlyCollection<Spring>(springs);
VertexBodies = new ReadOnlyCollection<MassPoint>(points);
Triangles = new ReadOnlyCollection<Triangle>(triangles);
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 = 0.01f; spring.BiasFactor = 0.1f;
springs.Add(spring);
}
}
foreach (Spring spring in springs)
{
JVector delta = spring.body1.position - spring.body2.position;
if (delta.Z != 0.0f && delta.X != 0.0f) 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 = 0.01f; spring1.BiasFactor = 0.1f;
Spring spring2 = new Spring(points[(e + 0) * sizeX + i + 0], points[(e + 2) * sizeX + i + 0]);
spring2.Softness = 0.01f; spring2.BiasFactor = 0.1f;
spring1.SpringType = SpringType.BendSpring;
spring2.SpringType = SpringType.BendSpring;
springs.Add(spring1);
springs.Add(spring2);
}
}
}
public static void ExtractData(List<JVector> vertices, List<TriangleVertexIndices> indices, Model model)
{
Matrix[] bones_ = new Matrix[model.Bones.Count];
model.CopyAbsoluteBoneTransformsTo(bones_);
foreach (ModelMesh modelmesh in model.Meshes)
{
JMatrix xform = Conversion.ToJitterMatrix(bones_[modelmesh.ParentBone.Index]);
foreach (ModelMeshPart meshPart in modelmesh.MeshParts)
{
// Before we add any more where are we starting from
int offset = vertices.Count;
// Read the format of the vertex buffer
VertexDeclaration declaration = meshPart.VertexBuffer.VertexDeclaration;
VertexElement[] vertexElements = declaration.GetVertexElements();
// Find the element that holds the position
VertexElement vertexPosition = new VertexElement();
foreach (VertexElement vert in vertexElements)
{
if (vert.VertexElementUsage == VertexElementUsage.Position &&
vert.VertexElementFormat == VertexElementFormat.Vector3)
{
vertexPosition = vert;
// There should only be one
break;
}
}
// Check the position element found is valid
if (vertexPosition == null ||
vertexPosition.VertexElementUsage != VertexElementUsage.Position ||
vertexPosition.VertexElementFormat != VertexElementFormat.Vector3)
{
throw new Exception("Model uses unsupported vertex format!");
}
// This where we store the vertices until transformed
JVector[] allVertex = new JVector[meshPart.NumVertices];
// Read the vertices from the buffer in to the array
meshPart.VertexBuffer.GetData<JVector>(
meshPart.VertexOffset * declaration.VertexStride + vertexPosition.Offset,
allVertex,
0,
meshPart.NumVertices,
declaration.VertexStride);
// Transform them based on the relative bone location and the world if provided
for (int i = 0; i != allVertex.Length; ++i)
{
JVector.Transform(ref allVertex[i], ref xform, out allVertex[i]);
}
// Store the transformed vertices with those from all the other meshes in this model
vertices.AddRange(allVertex);
// Find out which vertices make up which triangles
if (meshPart.IndexBuffer.IndexElementSize != IndexElementSize.SixteenBits)
{
// This could probably be handled by using int in place of short but is unnecessary
throw new Exception("Model uses 32-bit indices, which are not supported.");
}
// Each primitive is a triangle
short[] indexElements = new short[meshPart.PrimitiveCount * 3];
meshPart.IndexBuffer.GetData<short>(
meshPart.StartIndex * 2,
indexElements,
0,
meshPart.PrimitiveCount * 3);
// Each TriangleVertexIndices holds the three indexes to each vertex that makes up a triangle
TriangleVertexIndices[] tvi = new TriangleVertexIndices[meshPart.PrimitiveCount];
for (int i = 0; i != tvi.Length; ++i)
{
// The offset is because we are storing them all in the one array and the
// vertices were added to the end of the array.
tvi[i].I0 = indexElements[i * 3 + 0] + offset;
tvi[i].I1 = indexElements[i * 3 + 1] + offset;
tvi[i].I2 = indexElements[i * 3 + 2] + offset;
}
// Store our triangles
indices.AddRange(tvi);
}
}
}
/// <summary>
/// Initialize the physic world with the geometric detail of map.
/// </summary>
/// <param name="map">The base to create the physic world.</param>
private void Initialize(Map.Map map)
{
List<JVector> vertices = new List<JVector>();
List<TriangleVertexIndices> indices = new List<TriangleVertexIndices>();
for (uint i = 0; i < map.Width; i++)
for (uint j = 0; j < map.Length; j++)
for (uint k = 0; k < map.Height; k++)
{
int pos = 0;
Block block = map.GetBlock(new Vector3(i, j, k));
block.CreateColisions();
foreach (JVector vertice in block.CollisionVertices)
{
vertices.Add(vertice);
pos++;
}
int newPos = vertices.Count - pos;
foreach (TriangleVertexIndices indice in block.CollisionTriangles)
{
TriangleVertexIndices t = new TriangleVertexIndices(indice.I0 + newPos, indice.I1 + newPos, indice.I2 + newPos);
indices.Add(t);
}
}
//ToDo: The vertices list has duplicated vertices. In the worst case each vertices has 4 different instantiation.
//Probably some performance can be expected by remove the duplicated ones.
//However it is also necessary to update the indies List with the correct positions.
Octree tree = new Octree(vertices, indices);
TriangleMeshShape shape = new TriangleMeshShape(tree);
RigidBody body = new RigidBody(shape);
body.IsStatic = true;
world.AddBody(body);
}
public static Octree BuildOctree(Model model) {
List<JVector> vertices = new List<JVector>();
List<TriangleVertexIndices> indices = new List<TriangleVertexIndices>();
Matrix[] bones = new Matrix[model.Bones.Count];
model.CopyAbsoluteBoneTransformsTo(bones);
foreach (ModelMesh modelMesh in model.Meshes)
{
JMatrix boneTransform = PhysicsSystem.toJMatrix(bones[modelMesh.ParentBone.Index]);
foreach (ModelMeshPart meshPart in modelMesh.MeshParts)
{
int offset = vertices.Count;
var meshVertices = meshPart.VertexBuffer.Resource.Buffer.GetData<JVector>();
for (int i = 0; i < meshVertices.Length; ++i)
{
JVector.Transform(ref meshVertices[i], ref boneTransform, out meshVertices[i]);
}
vertices.AddRange(meshVertices); // append transformed vertices
// there should DEFINITELY be a check here to ensure that the indices used in the model
// don't exceed 65535 (max short int). If the model doesn't use shorts, then they get cast all weird.
var indexElements = meshPart.IndexBuffer.Resource.GetData<short>();
// Each TriangleVertexIndices holds the indices that constitute a triangle primitive
TriangleVertexIndices[] tvi = new TriangleVertexIndices[indexElements.Length];
for (int i = 0; i <= tvi.Length - 2; i += 3) {
tvi[i].I0 = indexElements[i + 0] + offset;
tvi[i].I1 = indexElements[i + 1] + offset;
tvi[i].I2 = indexElements[i + 2] + offset;
}
indices.AddRange(tvi); // append triangles
}
}
Octree ot = new Octree(vertices, indices);
//ot.BuildOctree(); // (already happens in Octree constructor)
return ot;
}
