Draw 2D Physics Shapes in Unity3D
This tutorial project provides an example of how to draw shapes with the cursor in Unity similar to IncrediBots or Phun (now Algodoo).
The core logic of this project uses vertices specified from the cursor's coordinates to dynamically generate and configure a mesh, outline, and 2D collider.
- Go to the Tutorial to read about how it works in greater detail.
- Play it in your browser
- Unity Asset Store Bundle
Project Overview
Requires Unity3D (tested with 2017.x, but should also work with 5.x)
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βββ _Scenes
| βββ Main.unity - The project's main scene
βββ Prefab
| βββ Circle.prefab - Circle physics shape
| βββ Platform.prefab - Stationary rectangular physics platform
| βββ Rectangle.prefab - Rectangle physics shape
| βββ RotatingPlatform.prefab - Rotating rectangular physics platform
| βββ Triangle.prefab - Triangle physics shape
βββ Scripts
βββ DrawCircle.cs - Creates circle meshes and colliders
βββ DrawController.cs - Captures mouse input and creates shapes
βββ DrawRectangle.cs - Creates rectangle meshes and colliders
βββ DrawShape.cs - Base class for all shapes
βββ DrawTriangle.cs - Creates triangle meshes and colliders
βββ ExplosionController.cs - Generates explosion forces at the cursor
βββ TestPolygon.cs - Demonstrates how to draw polygon meshes
βββ Triangulator.cs - Generates triangles from polygon vertices
βββ Util.cs - Provides handy operations on vectors
Running the Project
To run the project, open _Scenes/Main.unity and click on the play button.
In the main scene there will be three buttons: square, circle, and triangle. Click on one of the buttons and then click 2-3 points in the game view to draw and release a physics shape. The shape will react to gravity and interact with other objects in the scene.