Function GetPineTreeImage

src/Generating/Trees.cpp:555–602

void GetPineTreeImage(int a_BlockX, int a_BlockY, int a_BlockZ, cNoise & a_Noise, int a_Seq, sSetBlockVector & a_LogBlocks, sSetBlockVector & a_OtherBlocks)
{
	// Tall, little leaves on top. The top leaves are arranged in a shape of two cones joined by their bases.
	// There can be one or two layers representing the cone bases (SameSizeMax)
	
	int MyRandom = a_Noise.IntNoise3DInt(a_BlockX + 32 * a_Seq, a_BlockY, a_BlockZ + 32 * a_Seq) / 8;
	int TrunkHeight = 8 + (MyRandom % 3);
	int SameSizeMax = ((MyRandom & 8) == 0) ? 1 : 0;
	MyRandom >>= 3;
	int NumLeavesLayers = 2 + (MyRandom % 3);  // Number of layers that have leaves in them
	if (NumLeavesLayers == 2)
	{
		SameSizeMax = 0;
	}
	
	// Pre-allocate the vector:
	a_LogBlocks.reserve(TrunkHeight);
	a_OtherBlocks.reserve(NumLeavesLayers * 25);

	// The entire trunk, out of logs:
	for (int i = TrunkHeight; i >= 0; --i)
	{
		a_LogBlocks.push_back(sSetBlock(a_BlockX, a_BlockY + i, a_BlockZ, E_BLOCK_LOG, E_META_LOG_CONIFER));
	}
	int h = a_BlockY + TrunkHeight + 2;

	// Top layer - just a single leaves block:	
	a_OtherBlocks.push_back(sSetBlock(a_BlockX, h, a_BlockZ, E_BLOCK_LEAVES, E_META_LEAVES_CONIFER));
	h--;

	// One more layer is above the trunk, push the central leaves:	
	a_OtherBlocks.push_back(sSetBlock(a_BlockX, h, a_BlockZ, E_BLOCK_LEAVES, E_META_LEAVES_CONIFER));

	// Layers expanding in size, then collapsing again:
	// LOGD("Generating %d layers of pine leaves, SameSizeMax = %d", NumLeavesLayers, SameSizeMax);
	for (int i = 0; i < NumLeavesLayers; ++i)
	{
		int LayerSize = std::min(i, NumLeavesLayers - i + SameSizeMax - 1);
		// LOGD("LayerSize %d: %d", i, LayerSize);
		if (LayerSize < 0)
		{
			break;
		}
		ASSERT((size_t)LayerSize < ARRAYCOUNT(BigOs));
		PushCoordBlocks(a_BlockX, h, a_BlockZ, a_OtherBlocks, BigOs[LayerSize].Coords, BigOs[LayerSize].Count, E_BLOCK_LEAVES, E_META_LEAVES_CONIFER);
		h--;
	}
}