1. Creating & Using Sprites Adding Colliders
Including RigidBody Components
Customizing Physics 2D Materials

2. PowerPoint or OpenOffice Impress
can be used to model sprites
Most tools of this type have bitmap
textures such as brick, stone, and grass
set borders to zero

3. Paint Shop Pro
Copy and Paste objects from PowerPoint to PaintShopPro and save them as .png images
be careful not to use smoothing or sharpening filters on the images
make magenta (255,0,255) the background color and then set
the transparency to the background color

4. Adding Images to the Assets in a Unity Project
just click-and-drag the images from the desktop
to the Assets Panel (or in a folder in the Panel)

5. Making the Images into Game Sprites
now you can click-and-drag copies of these images into your game

6. Adding Colliders to Sprites
bases and walls get edge colliders
platform bricks get box colliders
circular objects get circle colliders
complex shapes get polygon colliders
1. highlight sprite
2. click on add component
3. select Physics 2D
4. then choose collider

7. Edge Colliders Can Span Multiple Sprites
you can click-and-drag collider points (green) to reshape the boundary
you can click on a different spot to create a new point on a collider boundary
you can control-click (red) points to delete them

8. Polygon Colliders
when polygon colliders are added to complex shapes they often need to be edited

9. Editing a Polygon Collider
You can click-and-drag articulation points on the collider
You can add articulation points by clicking on the collider border
You can delete articulation points by control-clicking them

10. RigidBody Components
For two object to interact at least one of them must also have a rigidbody component. RigidBody components are typically attached to moving objects only.

11. RigidBody 2D Components have a Gravity Property

12. RigidBody 2D Components have a Gravity Property

13. Physics Material 2D
we can create custom properties such as friction and bounciness to objects by adding
Physics Materal 2D components

14. the Physics Material 2D component is added to the Material field of the collider of the sprite
whose material properties we are modifying