/// <summary>
/// Builds polygon mesh from the provided contours.
/// </summary>
/// <remarks>
/// <para>
/// The values of the CellSize-based parameters will be converted to world units.
/// </para>
/// </remarks>
/// <param name="context">The context to use for the operation.</param>
/// <param name="contours">The contours to use to build the mesh.</param>
/// <param name="maxVertsPerPoly">
/// The maximum allowed vertices for a polygon.
/// [Limits: 3 <= value <= <see cref="NMGen.MaxAllowedVertsPerPoly"/>]
/// </param>
/// <param name="walkableHeight">
/// The walkable height used to build the contour data.
/// [Limit: >= <see cref="NMGen.MinWalkableHeight"/>] [Units: YCellSize]
/// </param>
/// <param name="walkableRadius">
/// The radius used to erode the walkable area covered by the contours.
/// [Limit: >= 0] [Units: XZCellSize]
/// </param>
/// <param name="walkableStep">
/// The walkable step used to build
/// the contour data. [Limit: >= 0] [Units: YCellSize]</param>
/// <returns>The generated polygon mesh, or null if there were errors.</returns>
public static PolyMesh Build(BuildContext context, ContourSet contours
, int maxVertsPerPoly, int walkableHeight, int walkableRadius, int walkableStep)
{
if (context == null || contours == null)
{
return(null);
}
PolyMesh result = new PolyMesh(AllocType.External);
if (!PolyMeshEx.rcpmBuildFromContourSet(context.root
, contours.root
, maxVertsPerPoly
, ref result.root
, ref result.mMaxVerts))
{
return(null);
}
result.mWalkableHeight = walkableHeight * contours.YCellSize;
result.mWalkableRadius = walkableRadius * contours.XZCellSize;
result.mWalkableStep = walkableStep * contours.YCellSize;
return(result);
}
/// <summary>
/// Gets a serialized version of the mesh that can be used to
/// recreate it later.
/// </summary>
/// <param name="includeBuffer">
/// True if serialized data should include the full buffer size. Otherwise the unused
/// portion of the buffers will removed and the smallest possible serialized data returned.
/// </param>
/// <returns>A serialized version of the mesh.</returns>
public byte[] GetSerializedData(bool includeBuffer)
{
if (IsDisposed)
{
return(null);
}
// Design note: This is implemented using an interop call
// rather than local code bacause it is much more easier to
// serialize in C++ than it is in C#.
IntPtr ptr = IntPtr.Zero;
int dataSize = 0;
if (!PolyMeshEx.rcpmGetSerializedData(ref root
, mMaxVerts
, mWalkableHeight
, mWalkableRadius
, mWalkableStep
, includeBuffer
, ref ptr
, ref dataSize))
{
return(null);
}
byte[] result = UtilEx.ExtractArrayByte(ptr, dataSize);
NMGenEx.nmgFreeSerializationData(ref ptr);
return(result);
}
private PolyMesh(SerializationInfo info, StreamingContext context)
: base(AllocType.External)
{
// Note: Version compatability is handled by the interop call;
byte[] rawData = (byte[])info.GetValue(DataKey, typeof(byte[]));
PolyMeshEx.rcpmBuildSerializedData(rawData
, rawData.Length
, ref root
, ref mMaxVerts
, ref mWalkableHeight
, ref mWalkableRadius
, ref mWalkableStep);
}
/// <summary>
/// Creates a polygon mesh from the data generated by the <see cref="GetSerializedData"/>
/// method.
/// </summary>
/// <param name="serializedMesh">The serialized mesh data.</param>
/// <returns>The new polygon mesh, or null on error.</returns>
public static PolyMesh Create(byte[] serializedMesh)
{
PolyMesh result = new PolyMesh(AllocType.External);
if (PolyMeshEx.rcpmBuildSerializedData(serializedMesh
, serializedMesh.Length
, ref result.root
, ref result.mMaxVerts
, ref result.mWalkableHeight
, ref result.mWalkableRadius
, ref result.mWalkableStep))
{
return(result);
}
return(null);
}
/// <summary>
/// Frees all resources and marks the object as disposed.
/// </summary>
public override void RequestDisposal()
{
if (!IsDisposed)
{
if (ResourceType == AllocType.Local)
{
Marshal.FreeHGlobal(root.areas);
Marshal.FreeHGlobal(root.flags);
Marshal.FreeHGlobal(root.polys);
Marshal.FreeHGlobal(root.regions);
Marshal.FreeHGlobal(root.verts);
}
else if (ResourceType == AllocType.External)
{
PolyMeshEx.rcpmFreeMeshData(ref root);
}
root.Reset();
mMaxVerts = 0;
mWalkableHeight = 0;
mWalkableStep = 0;
}
}
