Updated "Size of a chunk" section of design docs
This commit is contained in:
Andrew Brown
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Before Width: | Height: | Size: 21 KiB After Width: | Height: | Size: 19 KiB |
@@ -307,52 +307,40 @@ directions of the offsets are changed, but the amounts are the same.
|
|||||||
The size of a chunk
|
The size of a chunk
|
||||||
-------------------
|
-------------------
|
||||||
Now that we know how to place blocks relative to each other, we can begin to
|
Now that we know how to place blocks relative to each other, we can begin to
|
||||||
construct a chunk section.
|
construct an entire chunk section.
|
||||||
|
|
||||||
Since the block sprites are 24 by 24 pixels, and the diagonal of the 16 by 16
|
Since the block sprites are 24 by 24 pixels, and the diagonal of the 16 by 16
|
||||||
grid is 16 squares, the width of one rendered chunk will be 384 pixels. Just
|
grid is 16 squares, the width of one rendered chunk section will be 384 pixels.
|
||||||
considering the top layer of the blocks:
|
Just considering the top layer of blocks within a section:
|
||||||
|
|
||||||
.. image:: cuberenderimgs/chunk_width.png
|
.. image:: cuberenderimgs/chunk_width.png
|
||||||
:alt: Illustrating the width of a single chunk
|
:alt: Illustrating the width of a single chunk
|
||||||
|
|
||||||
Since cubes next to each other in the same "diagonal row" are offset by 24
|
Since blocks next to each other in the same "diagonal row" are offset by 24
|
||||||
pixels, this is trivially calculated.
|
pixels, this is trivially calculated.
|
||||||
|
|
||||||
The height is a bit more tricky to calculate. Let's start by calculating the
|
The height is a bit more tricky to calculate. Let's start by calculating the
|
||||||
height of a single stack of 128 cubes.
|
height of a single stack of 16 blocks.
|
||||||
|
|
||||||
If the top of a stack of cubes is at Y value 0, the 128th cube down must be
|
The non-overlapping edge of each block sprite is 12 pixels high. Since there are
|
||||||
drawn (128-1)*12=1524 pixels below. However, that's not the end of the story.
|
16 blocks in this stack, that's 192 pixels high. There are also 6 additional
|
||||||
The bottom cube has a height of 24 pixels, so the height of a rendered stack of
|
pixels at the top and bottom of the stack as shown, giving a total height of 204
|
||||||
128 cube is 1548 pixels.
|
pixels.
|
||||||
|
|
||||||
.. image:: cuberenderimgs/cube_stack128.png
|
.. image:: cuberenderimgs/cube_stack16.png
|
||||||
:alt: A stack of 128 cubes takes 1560 vertical pixels to draw.
|
:alt: A stack of 16 cubes takes 204 vertical pixels to draw.
|
||||||
|
|
||||||
You can also calculate this by looking at the sides of the cubes, which don't
|
But that's just for one column of blocks. What about the entire chunk section?
|
||||||
overlap at all. They are 12 pixels each, times 128 cubes in the stack, gives
|
Take a look at this diagram:
|
||||||
1536 pixels. Add in the 6 pixels for the top cube and the 6 pixels for the
|
|
||||||
bottom cube to get the total height of 1548 pixels.
|
|
||||||
|
|
||||||
So what about the entire chunk? Let's take a look at the top and bottom few
|
|
||||||
layers of a chunk.
|
|
||||||
|
|
||||||
.. image:: cuberenderimgs/chunk_height.png
|
.. image:: cuberenderimgs/chunk_height.png
|
||||||
:alt: The highest and lowest positioned cubes in a chunk
|
:alt: The highest and lowest positioned cubes in a chunk
|
||||||
|
|
||||||
Let's let the red cubes represent the stack from above. The one on the top we'll
|
The green highlighted blocks are the stack we calculated just above and have a
|
||||||
define as position 0, with our vertical axis running positively downward (as is
|
height of 204 pixels. The red highlighted blocks each take 12 pixels of vertical
|
||||||
the case in a lot of imaging library coordinate systems) Therefore, the bottom
|
space on the image, and there are 15 of them. So 204 + 12*15 is 384 pixels.
|
||||||
red cube is at vertical offset 1524 below.
|
|
||||||
|
|
||||||
The green cube at the bottom most tip is the cube with the lowest vertical
|
So the total size of a chunk section in pixels is 384 wide by 384 tall.
|
||||||
placement on the image, so its offset plus 24 pixels for its height will be the
|
|
||||||
chunk height. Since the green cubes each have an offset of 12 pixels, add 15*12
|
|
||||||
pixels to get the offset of the lowest green cube: 1704.
|
|
||||||
|
|
||||||
So the total size of a chunk in pixels is 384 wide by 1728 tall. That's pretty
|
|
||||||
tall!
|
|
||||||
|
|
||||||
Assembling a Chunk
|
Assembling a Chunk
|
||||||
------------------
|
------------------
|
||||||
|
|||||||
Reference in New Issue
Block a user