Method getHeight

src/main/java/net/minecraft/world/World.java:679–700

Returns the position at this x, z coordinate in the chunk with y set to the value from the height map.

(BlockPos pos)

     * Returns the position at this x, z coordinate in the chunk with y set to the value from the height map.
     */
    public BlockPos getHeight(BlockPos pos)
    {
        int i;

        if (pos.getX() >= -30000000 && pos.getZ() >= -30000000 && pos.getX() < 30000000 && pos.getZ() < 30000000)
        {
            if (this.isChunkLoaded(pos.getX() >> 4, pos.getZ() >> 4, true))
            {
                i = this.getChunkFromChunkCoords(pos.getX() >> 4, pos.getZ() >> 4).getHeightValue(pos.getX() & 15, pos.getZ() & 15);
            }
            else
            {
                i = 0;
            }
        }
        else
        {
            i = this.func_181545_F() + 1;
        }

        return new BlockPos(pos.getX(), i, pos.getZ());
    }

    /**
     * Gets the lowest height of the chunk where sunlight directly reaches