public override void LoadPage(PageInfo page)
{
//Calculate x/z indexes for the grid array
page.XIndex -= (int)System.Math.Floor(mGridBounds.Left / mPageSize);
page.ZIndex -= (int)System.Math.Floor(mGridBounds.Top / mPageSize);
//Check if the requested page is in bounds
if (page.XIndex < 0 || page.ZIndex < 0 || page.XIndex >= mPageGridX || page.ZIndex >= mPageGridZ)
{
return;
}
//For each tree type...
foreach (KeyValuePair <Entity, List <List <TreeDef> > > it in mPageGridList)
{
//Get the appropriate tree list for the specified page
List <List <TreeDef> > pageGrid = it.Value;
List <TreeDef> treeList = GetGridPage(pageGrid, page.XIndex, page.ZIndex);
Entity entity = it.Key;
//Load the listed trees into the page
foreach (TreeDef o in treeList)
{
//Get position
Vector3 pos = Vector3.Zero;
pos.x = page.Bounds.Left + ((float)o.XPos / 65535) * mPageSize;
pos.z = page.Bounds.Top + ((float)o.ZPos / 65535) * mPageSize;
//Calculate terrain height at pos.x / pos.z to get pos.y
if (mHeightFunction != null)
{
pos.y = mHeightFunction.GetHeightAt(pos.x, pos.z, mHeightFunctionUserData);
}
else
{
pos.y = 0.0f;
}
//Get rotation
Degree angle = new Degree((Real)o.Rotation * (360.0f / 255));
Quaternion rot = Quaternion.FromAngleAxis((float)angle.InRadians, Vector3.UnitY);
//Get scale
Vector3 scale = Vector3.Zero;
scale.y = (float)(o.Scale * (mMaximumScale / 255) + mMinimumScale);
scale.x = scale.y;
scale.z = scale.y;
//Get color
ColorEx col = ColorEx.White;
if (mColorMap != null)
{
col = mColorMap.GetColorAtUnpacked(pos.x, pos.z);
}
AddEntity(entity, pos, rot, scale, col);
}
}
}
/// <summary>
///
/// </summary>
/// <param name="page"></param>
/// <param name="layer"></param>
/// <param name="grassPostions"></param>
/// <param name="grassCount"></param>
/// <returns></returns>
private Mesh GenerateGrassQuad(PageInfo page, GrassLayer layer, IntPtr grassPostions, int grassCount)
{
//Calculate the number of quads to be added
int quadCount = grassCount;
//Create manual mesh to store grass quads
Mesh mesh = (Mesh)MeshManager.Instance.CreateManual(GetUniqueID(), ResourceGroupManager.DefaultResourceGroupName, null);
SubMesh subMesh = mesh.CreateSubMesh();
subMesh.useSharedVertices = false;
//Setup vertex format information
subMesh.vertexData = new VertexData();
subMesh.vertexData.vertexStart = 0;
subMesh.vertexData.vertexCount = 4 * quadCount;
VertexDeclaration dcl = subMesh.vertexData.vertexDeclaration;
int offset = 0;
dcl.AddElement(0, offset, VertexElementType.Float3, VertexElementSemantic.Position);
offset += VertexElement.GetTypeSize(VertexElementType.Float3);
dcl.AddElement(0, offset, VertexElementType.Color, VertexElementSemantic.Diffuse);
offset += VertexElement.GetTypeSize(VertexElementType.Color);
dcl.AddElement(0, offset, VertexElementType.Float2, VertexElementSemantic.TexCoords);
offset += VertexElement.GetTypeSize(VertexElementType.Float2);
//Populate a new vertex buffer with grass
HardwareVertexBuffer vbuf = HardwareBufferManager.Instance.CreateVertexBuffer(
/*offset*/ dcl, subMesh.vertexData.vertexCount, BufferUsage.DynamicWriteOnly, false);
unsafe
{
float *pReal = (float *)vbuf.Lock(BufferLocking.Discard);
//Calculate size variance
float rndWidth = layer.mMaxWidth - layer.mMinWidth;
float rndHeight = layer.mMaxHeight - layer.mMinHeight;
float minY = float.PositiveInfinity, maxY = float.NegativeInfinity;
float *posPtr = (float *)grassPostions; //Position array "iterator"
for (int i = 0; i < grassCount; i++)
{
//Get the x and z positions from the position array
float x = *posPtr++;
float z = *posPtr++;
//Get the color at the grass position
uint color = 0;
if (layer.ColorMap != null)
{
color = layer.ColorMap.GetColorAt(x, z);
}
else
{
color = 0xFFFFFFFF;
}
//Calculate size
float rnd = MogreLibMath.Utility.UnitRandom();//The same rnd value is used for width and height to maintain aspect ratio
float halfScaleX = (layer.mMinWidth + rndWidth * rnd) * 0.5f;
float scaleY = (layer.mMinWidth + rndHeight * rnd);
//Calculate rotation
float angle = MogreLibMath.Utility.RangeRandom(0, MogreLibMath.Utility.TWO_PI);
float xTrans = MogreLibMath.Utility.Cos(angle) * halfScaleX;
float zTrans = MogreLibMath.Utility.Sin(angle) * halfScaleX;
//Calculate heights and edge positions
float x1 = x - xTrans, z1 = z - zTrans;
float x2 = x + xTrans, z2 = z + zTrans;
float y1, y2;
if (mHeightFunction != null)
{
y1 = mHeightFunction.GetHeightAt(x1, z1, mHeightFunctionUserData);
y2 = mHeightFunction.GetHeightAt(x2, z2, mHeightFunctionUserData);
}
else
{
y1 = 0;
y2 = 0;
}
//Add vertices
*pReal++ = (x1 - page.CenterPoint.x); *pReal++ = (y1 + scaleY); *pReal++ = (z1 - page.CenterPoint.z); //pos
*((uint *)pReal++) = color; //color
*pReal++ = 0; *pReal++ = 0; //uv
*pReal++ = (x2 - page.CenterPoint.x); *pReal++ = (y2 + scaleY); *pReal++ = (z2 - page.CenterPoint.z); //pos
*((uint *)pReal++) = color; //color
*pReal++ = 1; *pReal++ = 0; //uv
*pReal++ = (x1 - page.CenterPoint.x); *pReal++ = (y1); *pReal++ = (z1 - page.CenterPoint.z); //pos
*((uint *)pReal++) = color; //color
*pReal++ = 0; *pReal++ = 1; //uv
*pReal++ = (x2 - page.CenterPoint.x); *pReal++ = (y2); *pReal++ = (z2 - page.CenterPoint.z); //pos
*((uint *)pReal++) = color; //color
*pReal++ = 1; *pReal++ = 1; //uv
//Update bounds
if (y1 < minY)
{
minY = y1;
}
if (y2 < minY)
{
minY = y2;
}
if (y1 + scaleY > maxY)
{
maxY = y1 + scaleY;
}
if (y2 + scaleY > maxY)
{
maxY = y2 + scaleY;
}
}
vbuf.Unlock();
subMesh.vertexData.vertexBufferBinding.SetBinding(0, vbuf);
//Populate index buffer
subMesh.indexData.indexStart = 0;
subMesh.indexData.indexCount = 6 * quadCount;
subMesh.indexData.indexBuffer = HardwareBufferManager.Instance.CreateIndexBuffer(
IndexType.Size16, subMesh.indexData.indexCount, BufferUsage.DynamicWriteOnly);
ushort *pI = (ushort *)subMesh.indexData.indexBuffer.Lock(BufferLocking.Discard);
for (ushort i = 0; i < quadCount; i++)
{
ushort ofset = (ushort)(i * 4);
* pI++ = (ushort)(0 + ofset);
* pI++ = (ushort)(2 + ofset);
* pI++ = (ushort)(1 + ofset);
*pI++ = (ushort)(1 + ofset);
*pI++ = (ushort)(2 + ofset);
*pI++ = (ushort)(3 + ofset);
}
subMesh.indexData.indexBuffer.Unlock();
//Finish up mesh
AxisAlignedBox bounds = new AxisAlignedBox(
new Vector3(page.Bounds.Left - page.CenterPoint.x, minY, page.Bounds.Top - page.CenterPoint.z),
new Vector3(page.Bounds.Right - page.CenterPoint.x, maxY, page.Bounds.Bottom - page.CenterPoint.z));
mesh.BoundingBox = bounds;
Vector3 tmp = bounds.Maximum - bounds.Minimum;
mesh.BoundingSphereRadius = tmp.Length * 0.5f;
mesh.Load();
//Apply grass material to mesh
subMesh.MaterialName = layer.Material.Name;
//Return the mesh
return(mesh);
}
}