Unity3d Hacks

Tutorial to make Circular Timer without any " shaders and masking " in unity3d .

Step 1  : Requirements

• semi circular texture 1
• semi circular texture 2 (should be same as texture 1).
• semi circular masking texture (Should be of different color).
• background image  (should be same as masking texture ).

Step 2  :  Settings that needs to be done in unity3d

• Camera settings : 

1. camera should be orthographic
2. local z position  = -10 units.
3. Rotation = Zero in all axis

• Import all these textures in unity asset folder.
• Apply each one of them on separate game objects of  "Sprite" type .
• Adjust the pivot points of texture 2 and masking texture for proper rotation.
• Adjust the textures in proper layers by setting the "z" value of their transform's local position in the inspector window .
• Background should be kept in the last layer.
• Texture 1 and 2 in same layer.
• Masking texture should be kept in the layer above texture 1 and 2.

Step 3 : The Hack

The masking texture is rotated along its pivot in the xy plane with an rotationAngle , where,

                                    rotationAngle  = 360 / Time (sec) .

As soon as the masking texture has rotated 180 degrees , the mask rotation is stopped and the masking texture is sent back of the background texture , thereby making it invisible ( you can also make it 's renderer off to get same result ) .Simultaneously , texture 2 is set to rotation for another 180 degrees .

And finally , what you see is a clocked timer .

The unity package consists of  timer prefab , ProgressManager script (in C #) and dummy textures .

The script has bool variable named  " StartTimer  " . Check to start the timer .

The needed files and complete Unity package can be downloaded from  HERE  .

Note :  This is just a small hack for those who don't want to get into the intense and complex unity shaders and masking for their 2D games .Using this , one can also make semi - circular progress bar ( use your wits and you can achieve this too) .