Python Scripting for the Blender Game Engine

Last updated 13 days ago by Chris Plush

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*This tutorial is up to date with the latest version of Blender. If you come across any errors please leave a comment below.*

In this beginner’s BGE Python tutorial you’ll learn how to use Python scripting in Blender to make a car move, increase in speed, and stop. Keep in mind the boxcar is simply used as an example of working with Python, not car physics. This tutorial will teach you the basics of Python scripting for the Blender game engine, including accessing and changing logic brick information through scripting. Before getting started, if you’re new to Python and for more general information on Python including formatting, statements, functions, blah blah, check out Beginner’s Guide To Python. None of the guides here take long to go through, and you’ll learn everything you need to know to get started in a day. The rest is learning through experience and necessity through your own projects. But even if you don’t know a single thing about Python, this tutorial is easy to follow.

Setting Things Up

I have 3 windows set up in Blender, top left is the 3d View, top right is the Text Editor, and spanning the bottom is Game Logic. Your blender should look the same for this tutorial. Once you have these windows in view we can start creating our little game. You should already have a basic understanding of how logic bricks work before reading this tutorial on using python, but it’s simple enough to follow along either way. The logic bricks are in the Game Logic window, with sensors on the left, controllers in the middle, and actuators on the right. Sensors act as triggers so that when something happens such as a key being pressed or a property value changes, an action can be performed. Controllers give you a set of options that determine how sensors are interpreted or used. Actuators make things happen when certain parameters are met.

Creating a New Python Script

In the Text Editor, create a new text file by pressing the “New” button in the header, and rename it to “cubeMove”. Before we write anything we want to check out some of our visual options. There are 3 icons next to the script name field where you just renamed your script. The first is line numbers. Click on this to enable it. This simply shows you numbers next to every line so you know what line of the script you’re typing on. This is essential for debugging because when there’s an error in your script, the System Console will tell you what line number the error is on. The other two icons are for word wrap, and syntax highlighting(which highlights python key words and such, I would enable this). One last thing we need to enable is the System Console. In older versions of Blender this was visible by default, but it’s not anymore. This is where all the script data and script errors will print out. To enable this in Windows, go into the top Window menu and select “Toggle System Console” if you don’t already have that window visible. For instructions on opening the console on Linux and Mac, click here.

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