Table of Contents

• Pixel Perfect
• Physics 2D
• Sprites
  • Packer
• Use Transform.up in 2D as forward
• Collider 2D

Pixel Perfect discussion

So on a screen height of 1080 with orthographic size of 5, each world space unit will take up 108 pixels (1080 / (5*2)). It's 5 * 2 because orthographic size specifies the size going from the center of the screen to the top.

Therefore if your Sprite’s Pixels Per Unit (PPU) settings is 108, it will be rendered nicely.

Orthographic size = ((Vert Resolution)/(PPUScale * PPU)) * 0.5

Physics 2D reference

• A Kinematic Rigidbody 2D does not collide with other Kinematic Rigidbody 2Ds or with Static Rigidbody 2Ds; it only collides with Dynamic Rigidbody 2Ds.

Sprites reference

Packer

• file:///Applications/Unity/Unity.app/Contents/Documentation/en/Manual/SpritePacker.html
• Edit -> Project Settings -> Editor
• Window -> Sprite Packer
• Required to specify a Packing Tag in the Texture Importer to enable packing for Sprites of that Texture.

Use Transform.up in 2D as forward howto

In 2D, you want to do your rotation in the Z-axis, and instead of .forward use .up or .right

Collider 2D reference

void OnTriggerEnter2D(Collider2D other) {
          if (other.CompareTag ("Bullet")) {
        Destroy (other.gameObject);
          }
}