touch-up to the wording and figures in design doc
This commit is contained in:
Andrew Brown
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@@ -6,9 +6,9 @@ to the right place!
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This document's scope does not cover the details of the code. The code is fairly
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well commented and not difficult to understand. Instead, this document is
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intended to give an explanation to how the Overviewer was designed and how all
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the pieces fit together. Think of this document as commenting on how all the
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high level pieces of the code work.
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intended to give an explanation to how the Overviewer was designed, why certain
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decisions were made, and how all the pieces fit together. Think of this document
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as commenting on how all the high level pieces of the code work.
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This document is probably a good read to anyone that wants to get involved in
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Overviewer development.
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@@ -54,15 +54,14 @@ exist.
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About the Rendering
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===================
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Minecraft worlds are rendered in an approximated Isometric projection
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[#isomorphicref]_, or
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what I call the "Sim City projection" [#isomorphicnote]_. In the original design, the projection
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acts as if your eye is infinitely far away looking down at the world at a 45
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degree angle in the South-East direction (now, the world can be rendered at any
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of the 4 oblique directions).
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Minecraft worlds are rendered in an approximated Isometric projection at an
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oblique angle. In the original design, the projection acts as if your eye is
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infinitely far away looking down at the world at a 45 degree angle in the
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South-East direction (now, the world can be rendered at any of the 4 oblique
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directions).
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.. [#isomorphicref] http://en.wikipedia.org/wiki/Isometric_projection
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.. [#isomorphicnote] To be honest, I'm not entirely sure it's technically an isomorphic projection. There are a lot of very similar projections.
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.. image:: screenshot.png
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:alt: A screenshot of Overviewer output
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In order to render a Minecraft world, there are a few steps that need to happen.
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These steps are explained in detail in the next few sections.
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@@ -76,28 +75,27 @@ Block Rendering
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===============
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.. This section shows how each block is pre-rendered
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The first step is rendering the blocks from the textures. Each block is built
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and cached in global variables of the :mod:`textures` module.
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The first step is rendering the blocks from the textures. Each block is "built"
|
||||
from its textures into an image of a cube and cached in global variables of the
|
||||
:mod:`textures` module.
|
||||
|
||||
Textures come in the size 16 by 16 [#f1]_. In order to render a cube out of
|
||||
this, I apply an `affine transformation`_ to the texture in order to skew it to
|
||||
the right shape.
|
||||
Textures come in the size 16 by 16 (higher resolution textures are resized and
|
||||
the process remains the same). In order to render a cube out of this, an `affine
|
||||
transformation`_ is applied to the texture in order to transform it to the top,
|
||||
left, and right faces of the cube.
|
||||
|
||||
.. image:: texturecubing.png
|
||||
:alt: A texture gets rendered into a cube
|
||||
|
||||
.. [#f1]
|
||||
Textures can come in other sizes and are re-sized so this section applies
|
||||
just the same.
|
||||
|
||||
.. _affine transformation: http://en.wikipedia.org/wiki/Affine_transformation
|
||||
|
||||
The result is an image of a cube that is 24 by 24 pixels large. This particular
|
||||
size for the cubes was chosen for an important reason: 24 is divisible by 2 and
|
||||
by 4. This makes placement much easier. E.g. in order to draw two cubes that are
|
||||
next to each other in the world, one are drawn exactly 12 pixels over and 6
|
||||
pixels down from the other. These kind of placement decisions all happen on
|
||||
exact pixel boundaries.
|
||||
The result is an image of a cube that is 24 by 24 pixels in size. This
|
||||
particular size for the cubes was chosen for an important reason: 24 is
|
||||
divisible by 2 and by 4. This makes placement much easier. E.g. in order to draw
|
||||
two cubes that are next to each other in the world, one is drawn exactly 12
|
||||
pixels over and 6 pixels down from the other. All placements of the cubes happen
|
||||
on exact pixel boundaries and no further resolution is lost beyond the initial
|
||||
transformations.
|
||||
|
||||
The transformation happens in two stages. First, the texture is transformed for
|
||||
the top of the cube. Then the texture is transformed for the left side of the
|
||||
@@ -105,11 +103,12 @@ cube, which is mirrored for the right side of the cube.
|
||||
|
||||
Top Transformation
|
||||
------------------
|
||||
The transformation from the top is a simple `affine transformation`_. It is
|
||||
actually several affine transformations: a re-size, a rotation, and a scaling;
|
||||
but since multiple affine transformations can be chained together simply by
|
||||
multiplying the transformation matrices together, only one transformation is
|
||||
actually done.
|
||||
|
||||
The transformation for the top face of the cube is a simple `affine
|
||||
transformation`_ from the original square texture. It is actually several affine
|
||||
transformations: a re-size, a rotation, and a scaling; but since multiple affine
|
||||
transformations can be chained together simply by multiplying the transformation
|
||||
matrices together, only one transformation is actually done.
|
||||
|
||||
This can be seen in the function :func:`textures.transform_image`. It takes
|
||||
these steps:
|
||||
@@ -139,9 +138,11 @@ interpolation to show the pixels.
|
||||
|
||||
Side Transformation
|
||||
-------------------
|
||||
The texture square is transformed for the sides of the cube in
|
||||
:func:`textures.transform_image_side`. This is another `affine transformation`_,
|
||||
but this time only two transformations are done: a re-size and a shear.
|
||||
|
||||
The texture square is transformed for the sides of the cube in the
|
||||
:func:`textures.transform_image_side` function. This is another `affine
|
||||
transformation`_, but this time only two transformations are done: a re-size and
|
||||
a shear.
|
||||
|
||||
1. First the texture is re-sized to 12 by 12 pixels. This is half the width of
|
||||
24 so it will have the correct width after the shear.
|
||||
|
||||
Reference in New Issue
Block a user