public SubGrid(int numRows, int numCols)
{
children = new SubGrid[4];
mesh = null;
box = null;
mNumRows = numRows;
mNumCols = numCols;
mNumTris = (mNumRows - 1) * (mNumCols - 1) * 2;
mNumVerts = mNumRows * mNumCols;
totalIndices = mNumVerts;
}
private void buildSubGridMesh(Rectangle R, WaterDMapVertex[] gridVerts, bool buildMesh, SubGrid subGrid)
{
VertexElement[] elems = WaterDMapVertex.CreateVertexElements();
//Mesh subMesh = new Mesh( subGrid.NumTris, subGrid.NumVerts, MeshFlags.Managed | MeshFlags.Use32Bit, elems, mGDevice );
Mesh subMesh = new Mesh(game, subGrid.NumTris, subGrid.NumVerts, WaterDMapVertex.StrideSize
, Graphics.AttributeSystem.CreateVertexDeclaration(game.GraphicsDevice, typeof(WaterDMapVertex)));
#region set subgrid verts & generate the bounding box
WaterDMapVertex[] v = new WaterDMapVertex[subMesh.NumberVertices];
Vector3[] positions = new Vector3[subMesh.NumberVertices];
//use a stream so we can pass it to computeBoundingBox
//GraphicsStream vertexStream = subMesh.LockVertexBuffer( LockFlags.None );
int k = 0;
for (int i = R.Top; i <= R.Bottom; i++)
{
for (int j = R.Left; j <= R.Right; j++)
{
v[k] = gridVerts[i * mInfo.vertCols + j];
positions[k] = gridVerts[i * mInfo.vertCols + j].pos;
k++;
}
}
//vertexStream.Write( v );
Utils.BoundingBox bndBox = new Utils.BoundingBox();
subMesh.SetVertexBufferData(v);
BoundingBox bb = BoundingBox.CreateFromPoints(positions);
bndBox.min = bb.Min;
bndBox.max = bb.Max;
//Geometry.ComputeBoundingBox( vertexStream, subMesh.NumberVertices, subMesh.VertexFormat, out bndBox.min, out bndBox.max );
//subMesh.UnlockVertexBuffer();
subGrid.box = bndBox;
if (buildMesh == false)
{
subMesh.Dispose();
subMesh = null;
return;
}
#endregion
#region generate Indices for the subgrid and Optimize
Vector3[] tempVerts;
int[] tempIndices;
Utils.GenTriGrid(subGrid.NumRows, subGrid.NumCols, mInfo.dx, mInfo.dz,
new Vector3(0, 0, 0), out tempVerts, out tempIndices);
/*int[] attributes = subMesh.LockAttributeBufferArray( LockFlags.None );
* for ( int i = 0; i < subGrid.NumTris; i++ )
* {
* attributes[ i ] = 0; // All in subset 0.
* }
*
* subMesh.UnlockAttributeBuffer();*/
subMesh.SetIndexBufferData(tempIndices);
int[] adjacency = new int[subMesh.NumberFaces * 3];
subMesh.GenerateAdjacency(.001f, adjacency);
//subMesh.OptimizeInPlace( MeshFlags.OptimizeVertexCache | MeshFlags.OptimizeAttributeSort, adjacency );
subMesh.OptimizeInPlace(0, adjacency);
#endregion
subGrid.mesh = subMesh;
}
