/// <summary>
/// Construct a mesh collision part from the specified vertices and indices.
/// </summary>
/// <param name="vertices">A list of all vertices contained in the mesh.</param>
/// <param name="indices">A list of vertex indices that define the triangles in the mesh.</param>
public MeshPart(Vector3[] vertices, int[] indices)
{
_body = new CompiledMesh(vertices, indices);
ApplyTransform(ref Transform);
}
/// <summary>
/// Construct a mesh collision part from a pre-compiled mesh.
/// </summary>
/// <param name="mesh">The compiled mesh that that this skin part will use.</param>
public MeshPart(CompiledMesh mesh)
{
_body = mesh;
ApplyTransform(ref Transform);
}
/// <summary>
/// Construct a mesh collision part from the specified vertices and indices.
/// </summary>
/// <param name="vertices">A list of all vertices contained in the mesh.</param>
/// <param name="indices">A list of vertex indices that define the triangles in the mesh.</param>
public MeshPart(Vector3[] vertices, int[] indices)
{
_body = new CompiledMesh(vertices, indices);
ApplyTransform(ref Transform);
}
public override ModelContent Process(NodeContent input, ContentProcessorContext context)
{
var attributes = input.Children.ToDictionary(n => n.Name, n => n.OpaqueData);
var nodesToRemove = (from node in input.Children
where node.OpaqueData.GetAttribute(TYPE_ATTR_NAME, MeshType.Both) == MeshType.Physical
select node).ToArray();
ModelContent model = base.Process(input, context);
var parts = new List<CompiledPart>();
var materials = new List<Material>();
var mass = new MassProperties();
var centerOfMass = Vector3.Zero;
foreach (var mesh in model.Meshes)
{
MeshType type = MeshType.Both;
PhysicalShape shape = PhysicalShape.Mesh;
float elasticity = _defaultElasticity, roughness = _defaultRoughness, density = _defaultDensity;
if (attributes.ContainsKey(mesh.Name))
{
type = attributes[mesh.Name].GetAttribute(TYPE_ATTR_NAME, MeshType.Both);
if (type == MeshType.Visual) continue;
elasticity = attributes[mesh.Name].GetAttribute(ELASTICITY_ATTR_NAME, _defaultElasticity);
roughness = attributes[mesh.Name].GetAttribute(ROUGHNESS_ATTR_NAME, _defaultRoughness);
density = attributes[mesh.Name].GetAttribute(DENSITY_ATTR_NAME, _defaultDensity);
shape = attributes[mesh.Name].GetAttribute(SHAPE_ATTR_NAME, _defaultShape);
}
var meshCenterOfMass = Vector3.Zero;
var meshMass = MassProperties.Immovable;
CompiledPart meshPart = null;
if (mesh.MeshParts.Count < 1)
{
continue;
}
int[] indices = mesh.MeshParts[0].IndexBuffer.Skip(mesh.MeshParts[0].StartIndex).Take(mesh.MeshParts[0].PrimitiveCount * 3).ToArray();
Vector3[] vertices = MeshToVertexArray(context.TargetPlatform, mesh);
if (_windingOrder == WindingOrder.Clockwise)
{
ReverseWindingOrder(indices);
}
switch (shape)
{
case PhysicalShape.Mesh:
{
meshPart = new CompiledMesh(vertices, indices);
meshMass = MassProperties.Immovable;
meshCenterOfMass = GetMeshTranslation(mesh);
}
break;
case PhysicalShape.Polyhedron:
{
var hull = new ConvexHull3D(vertices);
meshPart = hull.ToPolyhedron();
meshMass = MassProperties.FromTriMesh(density, vertices, indices, out meshCenterOfMass);
}
break;
case PhysicalShape.Sphere:
{
Sphere s;
Sphere.Fit(vertices, out s);
meshPart = new CompiledSphere(s.Center, s.Radius);
meshMass = MassProperties.FromSphere(density, s.Center, s.Radius);
meshCenterOfMass = s.Center;
}
break;
case PhysicalShape.Capsule:
{
Capsule c;
Capsule.Fit(vertices, out c);
meshPart = new CompiledCapsule(c.P1, c.P2, c.Radius);
meshMass = MassProperties.FromCapsule(density, c.P1, c.P2, c.Radius, out meshCenterOfMass);
}
break;
}
parts.Add(meshPart);
materials.Add(new Material(elasticity, roughness));
Vector3.Multiply(ref meshCenterOfMass, meshMass.Mass, out meshCenterOfMass);
Vector3.Add(ref centerOfMass, ref meshCenterOfMass, out centerOfMass);
mass.Mass += meshMass.Mass;
meshMass.Inertia.M44 = 0f;
Matrix.Add(ref mass.Inertia, ref meshMass.Inertia, out mass.Inertia);
}
// compute mass properties
Vector3.Divide(ref centerOfMass, mass.Mass, out centerOfMass);
mass.Inertia.M44 = 1f;
MassProperties.TranslateInertiaTensor(ref mass.Inertia, -mass.Mass, centerOfMass, out mass.Inertia);
if (centerOfMass.Length() >= Constants.Epsilon)
{
var transform = Matrix.CreateTranslation(-centerOfMass.X, -centerOfMass.Y, -centerOfMass.Z);
foreach (var p in parts)
{
p.Transform(ref transform);
}
transform = model.Root.Transform;
transform.M41 -= centerOfMass.X;
transform.M42 -= centerOfMass.Y;
transform.M43 -= centerOfMass.Z;
model.Root.Transform = transform;
}
mass = new MassProperties(mass.Mass, mass.Inertia);
var rbm = new RigidBodyModel(mass, parts.ToArray(), materials.ToArray());
// remove non-visual nodes
if (nodesToRemove.Length > 0)
{
foreach (var node in nodesToRemove)
input.Children.Remove(node);
model = base.Process(input, context);
}
model.Tag = rbm;
return model;
}
/// <summary>
/// Construct a mesh collision part from a pre-compiled mesh.
/// </summary>
/// <param name="mesh">The compiled mesh that that this skin part will use.</param>
public MeshPart(CompiledMesh mesh)
{
_body = mesh;
ApplyTransform(ref Transform);
}
