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    <blockquote> <p>It seems like all you'd need to do is write an animation loop that draws the models and updates repeatedly rather than actually program the code to draw every little thing.</p> </blockquote> <p>Everything that happens in a computer does so because a program of some form tells it <em>exactly what to do</em>. The letters that this message is composed of only appear because your web-browser of choice downloaded this file via TCP/IP over an HTTP protocol, decoded its UTF-8-encoded text, interpreted that text as defined by the XML, HTML, JavaScript, and so forth standards, and then displayed the visible portion as defined by the Unicode standard for text layout and in accord with HTML et al, using the displaying and windowing abilities of your OS or window manager or whatever.</p> <p>Every single part of that operation, from the downloading of the file to its display, is governed by a piece of code. Every pixel you are looking at on the screen is where it is because <em>some code</em> put it there.</p> <p>HTML <em>alone</em> doesn't mean anything. You cannot just take an HTML file and blast it to the screen. Some code must <em>interpret</em> it. You can interpret HTML as a text file, but if you do, it loses all formatting, and you get to see all of the tags. A web browsers can interpret it as proper HTML, in which case you get to see the formatting. But in every case, the meaning of the HTML file is determined by <em>how it is used</em>.</p> <p>The "draws the model" part of your proposed algorithm must be done by <em>someone</em>. If you don't write that code, then you must be using a library or some other system that will cause the model to appear. And what does that library do? How does it cause the model to appear?</p> <p>A model, like an HTML web page, is <em>meaningless by itself</em>. Or to put it another way, your algorithm can be boiled down to this:</p> <ol> <li>Animate the model.</li> <li>????</li> <li>Profit!</li> </ol> <p>You're missing a key component: how to actually interpret the model and cause it to appear on the screen. OpenGL/D3D/a software rasterizer/etc is vital for that task.</p>
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    1. POWhat is the purpose of a graphics library such as OpenGL?
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    1. COI appreciate the answer. So is it accurate to say a graphics library is just a collection of functions/methods that let you choose how and where to draw things to the screen? I think the source of my confusion is that the very first programming I did was some Java stuff, and Java includes methods like paint() with Swing and AWT. It didn't occur to me that the GUI toolkits included in Java actually had graphics libraries in them so I was taking those methods for granted.
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    2. COYes. Something, somewhere, has to actually draw the things. OpenGL is a portable, relatively low-level API to the code that does that for 3D graphics.
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