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Here's a tutorial that may be helpful to you<br />
<a href="http://www.actionscript.org/resources/articles/21/1/Continuously-Looping-Background/Page1.html" rel="ugc">http://www.actionscript.org/resources/articles/21/1/Continuously-Looping-Background/Page1.html</a><br />
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I suspect that your image will go from top to bottom rather than left to right, but the idea is similar.
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Here's a tutorial that may be helpful to you
http://www.actionscript.org/resources/articles/21/1/Continuously-Looping-Background/Page1.html [http://www.actionscript.org/resources/articles/21/1/Continuously-Looping-Background/Page1.html]

I suspect that your image will go from top to bottom rather than left to right, but the idea is similar.

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I asked for 3D so that means the road will go into the screen.<br />
I can already do 2D scrolling
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I asked for 3D so that means the road will go into the screen.
I can already do 2D scrolling

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In 3D how do you do repeating backgrounds?<br />
The issues of displaying a road for example in a car race (just straight head track with a few curves. NOt a loop. 
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In 3D how do you do repeating backgrounds?
The issues of displaying a road for example in a car race (just straight head track with a few curves. NOt a loop. 

repeating background

Adobe Flash (formerly Macromedia Flash) is a cross-platform multimedia and software platform used to embed animations, video, and interactive applications into web pages and desktop and mobile applications and games. Flash displays text, vector and raster graphics to provide animations, video games and applications. It allows streaming of audio and video, and can capture mouse, keyboard, microphone and camera input. The ActionScript programming language allows creation of interactive animations, video games, web applications, desktop applications and mobile applications.

Adobe Flash

A scripting language is a programming language that supports scripts, programs written for a special run-time environment that automate the execution of tasks that could alternatively be executed one-by-one by a human operator. Scripting languages are often interpreted (rather than compiled). Primitives are usually the elementary tasks or API calls, and the language allows them to be combined into more complex programs. Environments that can be automated through scripting include software applications, web pages within a web browser, the shells of operating systems (OS), embedded systems, as well as numerous games. A scripting language can be viewed as a domain-specific language for a particular environment; in the case of scripting an application, this is also known as an extension language.

Scripting Languages

Web development can range from developing the simplest static single page of plain text to the most complex web-based internet applications, electronic businesses, and social network services using a wide variety of languages and standards, including the familiar HTML, JavaScript and jQuery, ASP and ASP.NET, PHP, ColdFusion, CSS, PHP, Flex and Flash, but also the implementation of a broad list of standards including XML, WSDL, SSDL, VoiceXML and many more.