mlakewood / roll-a-ball

An Arcadia port of the Unity3D Roll a Ball tutorial

Roll_a_Ball

The Unity3D initial tutorial done in Arcadia.

Background

Unity3D is a game engine with a freely downloadable editor and IDE. The first tutorial is here https://unity3d.com/learn/tutorials/projects/roll-ball-tutorial and is a game where you roll a ball around an environment and pickup squares.

Arcadia is an extension to Unity3D that allows you to write your game in Clojure on the CLR.

This repo is the Roll a Ball tutorial in Unity written in Arcadia, with as much a one to one mapping so you can follow it along.

How to get running

1. Download and install Unity -> https://store.unity.com/
2. Clone this repo -> git clone https://github.com/mlakewood/roll-a-ball roll-a-ball
3. Install Arcadia -> $ cd roll-a-ball; ./install_arcadia.sh
4. Start Unity3D and open the roll-a-ball project.
5. Navigate to the project view and open the Roll a Ball scene. You should see a number of game objects including a StartObject
6. Once Arcadia has started connect the Arcadia Repl.
7. Import the rollball.core namespace and evaluate.
8. Run the following code:

rollball.core=> (require '[arcadia.core :refer [hook+]])
nil
rollball.core=> (def start-object (first (objects-named "StartObject")))
#'rollball.core/start-object
rollball.core=> (hook+ start-object :start #'start)
#unity/Object 9812
rollball.core=> 

9. Press the Play button in Unity and you should get the playfield up and be able to move the ball around with the arrows.

roll-a-ball's Issues

Unity 5.6.1f ArgumentException

Unity 5.6.1f reports an error when evaluating (hook+ start-object :start #'start) in the repl:

System.ArgumentException: No implementation of method: :gobj of protocol: #'arcadia.core/ISceneGraph found for class: nil