public static void LinkLeftAndRightPatches( TerrainPatch leftPatch, TerrainPatch rightPatch )
{
if ( leftPatch != null )
{
leftPatch.RightPatch = rightPatch;
}
if ( rightPatch != null )
{
rightPatch.LeftPatch = leftPatch;
}
}
public static void LinkTopAndBottomPatches( TerrainPatch topPatch, TerrainPatch bottomPatch )
{
if ( topPatch != null )
{
topPatch.BottomPatch = bottomPatch;
}
if ( bottomPatch != null )
{
bottomPatch.TopPatch = topPatch;
}
}
private bool BuildConnectingStripIndexBuffer( TerrainPatch neighbour, Side side, ICollection<int> indices )
{
if ( neighbour == null )
{
return false;
}
if ( LodLevel <= neighbour.LodLevel )
{
// Current patch has higher detail than neighbour patch
return false;
}
int index;
int nextIndexOffset;
int neighbourIndex;
int neighbourNextIndexOffset;
GetSideVars( side, out index, out nextIndexOffset, 1 );
neighbour.GetSideVars( OppositeSide( side ), out neighbourIndex, out neighbourNextIndexOffset, 0 );
int startError = ( int )Functions.Pow( 2, LodLevel - neighbour.LodLevel );
int error = startError;
for ( int count = 1; count < neighbour.m_Size; ++count )
{
if ( error == 0 )
{
indices.Add( neighbourIndex );
indices.Add( index );
indices.Add( index + nextIndexOffset );
index += nextIndexOffset;
error = startError;
}
indices.Add( neighbourIndex );
indices.Add( index );
indices.Add( neighbourIndex + neighbourNextIndexOffset );
neighbourIndex += neighbourNextIndexOffset;
--error;
}
indices.Add( neighbourIndex );
indices.Add( index );
indices.Add( index + nextIndexOffset );
return true;
}
/// <summary>
/// Setup constructor
/// </summary>
public CubeSide( int res, Point3 topLeft, Point3 topRight, Point3 bottomLeft, int defaultPatchLodLevel, bool defaultVisibility )
{
if ( ( res % 2 ) == 0 )
{
throw new ArgumentException( "Cube side resolution must be odd" );
}
m_Resolution = res;
m_Patches = new TerrainPatch[ res, res ];
Point3 rowStart = topLeft;
Vector3 xInc = ( topRight - topLeft ) / res;
Vector3 yInc = ( bottomLeft - topLeft ) / res;
// Create all the terrain patches and set their bounds
for ( int row = 0; row < res; ++row )
{
Point3 curPos = rowStart;
for ( int col = 0; col < res; ++col )
{
TerrainPatch newPatch = new TerrainPatch( );
newPatch.LodLevel = defaultPatchLodLevel;
newPatch.SetBounds( curPos, curPos + xInc, curPos + yInc );
m_Patches[ col, row ] = newPatch;
curPos += xInc;
}
rowStart += yInc;
}
// Link patches (this does not link edge patches to other cube side patches - this is done
// by calling LinkToSide())
int finalCol = res - 1;
int finalRow = res - 1;
for ( int row = 0; row < res; ++row )
{
for ( int col = 0; col < res; ++col )
{
TerrainPatch curPatch = m_Patches[ col, row ];
curPatch.LeftPatch = col == 0 ? null : m_Patches[ col - 1, row ];
curPatch.TopPatch = row == 0 ? null : m_Patches[ col, row - 1 ];
curPatch.RightPatch = col == finalCol ? null : m_Patches[ col + 1, row ];
curPatch.BottomPatch = row == finalRow ? null : m_Patches[ col, row + 1 ];
}
}
Visible = defaultVisibility;
}
