// Correct normal calculations
//http://www.gamedev.net/reference/articles/article2264.asp
public unsafe void Build( TerrainPatchBuilder builder )
{
using ( IVertexBufferLock vbLock = m_VbRange.Lock( ) )
{
m_IndexBuffer = BuildIndexBuffer( );
TerrainVertex* firstVertex = ( TerrainVertex* )vbLock.Bytes;
TerrainVertex* curVertex = firstVertex;
Vector3 xInc = m_PatchXDir * ( m_PatchWidth / ( m_Size - 1 ) );
Vector3 zInc = m_PatchZDir * ( m_PatchHeight / ( m_Size - 1 ) );
Point3 rowStart = m_TopLeft;
for ( int row = 0; row < m_Size; ++row )
{
Point3 curPt = rowStart;
for ( int col = 0; col < m_Size; ++col )
{
Vector3 rlVec = ( curPt - Point3.Origin ).MakeNormal( );
Point3 rlPt = Point3.Origin + rlVec * 2;
float ptHeight = ( TestNoisePlanetTerrainGenerator.TerrainHeight( rlPt.X, rlPt.Y, rlPt.Z ) - 0.5f ) * 16.0f;
rlPt = Point3.Origin + rlVec * ( PlanetRadius + ptHeight );
curVertex->SetPosition( rlPt.X, rlPt.Y, rlPt.Z );
++curVertex;
curPt += xInc;
}
rowStart += zInc;
}
for ( int row = 0; row < m_Size - 1; ++row )
{
curVertex = firstVertex + ( row * m_Size );
for ( int col = 0; col < m_Size - 1; ++col )
{
Point3 pt0 = curVertex->Position;
Point3 pt1 = ( curVertex + m_Size )->Position;
Point3 pt2 = ( curVertex + 1 )->Position;
Vector3 vec = Vector3.Cross( pt1 - pt0, pt2 - pt0 ).MakeNormal( );
// TODO: Make correct normal calculation
curVertex->SetNormal( vec.X, vec.Y, vec.Z );
++curVertex;
}
}
}
}
public void PreBuild( TerrainPatchBuilder builder )
{
DestroyIndexBuffer( );
m_VbRange = builder.AllocatePatchVertices( m_Lod );
m_Size = TerrainPatchBuilder.GetLevelSize( m_Lod );
m_Offset = m_VbRange.FirstVertexOffset;
}
/// <summary>
/// Pre-builds all terrain patches in this side
/// </summary>
public void PreBuild( TerrainPatchBuilder builder )
{
foreach ( TerrainPatch patch in TerrainPatches )
{
patch.PreBuild( builder );
}
}