This guide will walk you through the process of setting up your development environment for ImpactJS on Mac OSX.
To begin with, if you have not already purchased ImpactJS, do so here. ImpactJS is not free, and costs $99 to buy. It is a really good engine, and comes with many features such as a level editor. Here is a brief introduction video on ImpactJS, so you can learn more about the features if you are unfamiliar with them.
Once you have ImpactJS, you need a local server to run them. For this there are two popular options. OSX comes with an Apache server installed, which you can enable by using the System Preferences > Sharing > Web Sharing. Once you have turned this feature on, placing the files in the Sites folder is all you need to do to run Impact.
Alternatively, download and install MAMP. Once installed, place the ImpactJS files inside the htdocs folder and then simply direct your browser at the files. By default this would be http://localhost:8888/impact/ If set up correctly, you should now see the default ImpactJS ‘It Works’ screen.