Method GetHeightmapAt

src/Generating/DistortedHeightmap.cpp:541–566

int cDistortedHeightmap::GetHeightmapAt(NOISE_DATATYPE a_X, NOISE_DATATYPE a_Z)
{
	int ChunkX = (int)floor(a_X / (NOISE_DATATYPE)16);
	int ChunkZ = (int)floor(a_Z / (NOISE_DATATYPE)16);
	int RelX = (int)(a_X - (NOISE_DATATYPE)ChunkX * cChunkDef::Width);
	int RelZ = (int)(a_Z - (NOISE_DATATYPE)ChunkZ * cChunkDef::Width);

	// If we're withing the same chunk, return the pre-cached heightmap:
	if ((ChunkX == m_CurChunkX) && (ChunkZ == m_CurChunkZ))
	{
		return cChunkDef::GetHeight(m_CurChunkHeights, RelX, RelZ);
	}

	// Ask the cache:
	HEIGHTTYPE res = 0;
	if (m_HeightGen.GetHeightAt(ChunkX, ChunkZ, RelX, RelZ, res))
	{
		// The height was in the cache
		return res;
	}

	// The height is not in the cache, generate full heightmap and get it there:
	cChunkDef::HeightMap Heightmap;
	m_HeightGen.GenHeightMap(ChunkX, ChunkZ, Heightmap);
	return cChunkDef::GetHeight(Heightmap, RelX, RelZ);
}