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wrote more design docs on chunk positioning in tiles

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Andrew Brown
2011-10-30 03:00:28 -04:00
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@@ -336,6 +336,128 @@ Tile Rendering
==============
.. Covers the placement of chunk images on a tile
So now that we know how to draw a single chunk, we can move on to placing them
on an image.
For the diagrams in this section, we are positioning an entire chunk, but
frequently, only the top face of the chunk is drawn (shown in green below).
.. image:: tilerendering/topofchunk.png
:alt: The top of a chunk is highlighted
This makes it easier and less cumbersome to describe chunk positionings. Just
remember that chunks extend down for 1536 more pixels.
Chunk Addressing
----------------
Chunks in Minecraft have an X,Z address, starting at 0,0 and extending to
positive and negative infinity on both axes. Since we're looking at things
diagonally, however, we need a way of addressing these chunks in the final
image. For that, we refer to them in rows and columns. Consider this grid
showing the tops of a five by five region of chunks, labeled with their in-game
addresses.
.. image:: tilerendering/chunkgrid.png
:alt: A grid of 5x5 chunks showing how chunks are addressed.
Now, we want to transform each chunk to a row/column address as shown here:
.. image:: tilerendering/chunkgridwithrowcol.png
:alt: A grid of 5x5 chunks showing how chunks are addressed.
So the chunk at address 0,0 would be at col 0, row 0; while the chunk at address
1,1 would be at col 2, row 0. The intersection of the red and green lines
addresses the chunk in col,row format.
Notice that as a consequence of this addressing scheme, there is no chunk at
e.g. column 1 row 0. There are some col,row addresses that lie between chunks
(as can be seen where the red/green lines intersect at a chunk boundary instead
of the middle of a chunk). Something to keep in mind.
So how does one translate between them? It turns out that a chunk's column
address is simply the sum of the X and the Z coordinate, while the row is the
difference. Try it!
::
col = X + Z
row = Z - X
X = (col - row) / 2
Z = (col + row) / 2
Chunk Positioning
-----------------
Again just looking at the top of a chunk, we can work out how to position them
relative to each other. This is similar to how to position blocks relative to
each other, but this time, for chunks.
A chunk's top face is 384 pixels wide by 192 pixels tall. Similar to the block,
neighboring chunks have these relationships:
.. image:: tilerendering/chunkpositioning.png
:alt: Chunk positioning diagram
But that's all pretty trivial. With this knowledge, we could draw the chunks at
the above offsets in one large image, but for large worlds, that would quickly
become too much to handle. (Early versions of the Overviewer did this, but the
large, unwieldy images quickly motivated the development of rendering to
individual tiles)
Tile Layout
-----------
Instead of rendering to one large image, chunks are rendered to small tiles.
Only a handful of chunks need to be rendered into each tile. The downside is
that chunks must be rendered multiple times for each tile they appear in, but
the upside is that arbitrarily sized maps can be viewed.
The Overviewer uses a tile size of 384 by 384 pixels. This is the same as a
width of a chunk and is no coincidence. Just considering the top face of a
chunk, 8 chunks get rendered into a tile in this configuration:
.. image:: tilerendering/chunksintile.png
:alt: The 8 chunks that get rendered into a tile
So the overall strategy is to convert all chunks into diagonal col,row
coordinates, then for each tile decide which chunks belong in it, then render
them in the appropriate place on the tile.
The rendering routines are actually passed a range of chunks to render, e.g.
rows 4-6, cols 20-24. The lower bound col,row chunk given in the range is
rendered at position 0,0 in the diagram above. That is, at offset -192,-96
pixels.
The rendering routines takes the given range of columns and rows, converts it
back into chunk coordinates, and renders the given 8 chunks plus all chunks from
the 16 rows above the given range (see the note below). The chunks are
positioned correctly with the above positioning rules, so any chunks that are
out of the bounds get rendered off the tile and don't affect the final image.
(There is therefore no penalty for rendering out-of-bounds chunks for a tile
except increased processing)
.. note::
Remember that chunks are actually very tall, so there are actually several
rows above 0 in the above diagram that are rendered into the tile. Since the
chunk outlines in the diagrams are only the top face of the chunk, they most
likely don't contribute to the image since chunks usually don't have
anything to render way up at the top near the sky.
Since every other column of chunks is half-way in two tiles, they must be
rendered twice. Each neighboring tile is therefore only 2 columns over, not 3 as
one may suspect at first. Same goes for the rows: The next tile down is 4 rows
down, not 5.
Quadtrees
=========
.. About the tile output
get_range_by_path
-----------------
.. Explain the quadtree.QuadtreeGen._get_range_by_path method
Reading the Data Files
======================
..

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