Method GenerateSingleTree

src/Generating/StructGen.cpp:127–185

void cStructGenTrees::GenerateSingleTree(
	int a_ChunkX, int a_ChunkZ, int a_Seq,
	cChunkDesc & a_ChunkDesc,
	sSetBlockVector & a_OutsideLogs,
	sSetBlockVector & a_OutsideOther
)
{
	int x = (m_Noise.IntNoise3DInt(a_ChunkX + a_ChunkZ, a_ChunkZ, a_Seq) / 19) % cChunkDef::Width;
	int z = (m_Noise.IntNoise3DInt(a_ChunkX - a_ChunkZ, a_Seq, a_ChunkZ) / 19) % cChunkDef::Width;
	
	int Height = a_ChunkDesc.GetHeight(x, z);
	
	if ((Height <= 0) || (Height > 240))
	{
		return;
	}

	// Check the block underneath the tree:
	BLOCKTYPE TopBlock = a_ChunkDesc.GetBlockType(x, Height, z);
	if ((TopBlock != E_BLOCK_DIRT) && (TopBlock != E_BLOCK_GRASS) && (TopBlock != E_BLOCK_FARMLAND))
	{
		return;
	}
	
	sSetBlockVector TreeLogs, TreeOther;
	GetTreeImageByBiome(
		a_ChunkX * cChunkDef::Width + x, Height + 1, a_ChunkZ * cChunkDef::Width + z,
		m_Noise, a_Seq, 
		a_ChunkDesc.GetBiome(x, z),
		TreeLogs, TreeOther
	);

	// Check if the generated image fits the terrain. Only the logs are checked:
	for (sSetBlockVector::const_iterator itr = TreeLogs.begin(); itr != TreeLogs.end(); ++itr)
	{
		if ((itr->ChunkX != a_ChunkX) || (itr->ChunkZ != a_ChunkZ))
		{
			// Outside the chunk
			continue;
		}

		BLOCKTYPE Block = a_ChunkDesc.GetBlockType(itr->x, itr->y, itr->z);
		switch (Block)
		{
			CASE_TREE_ALLOWED_BLOCKS:
			{
				break;
			}
			default:
			{
				// There's something in the way, abort this tree altogether
				return;
			}
		}
	}
	
	ApplyTreeImage(a_ChunkX, a_ChunkZ, a_ChunkDesc, TreeOther, a_OutsideOther);
	ApplyTreeImage(a_ChunkX, a_ChunkZ, a_ChunkDesc, TreeLogs,  a_OutsideLogs);