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Graphics effect is a video effect which requires non-trivial usage of standard graphics library calls, or custom graphics processing algorithms like shaders to achieve the required result.
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In Unity3D, how do I create an efficient scratch card effect?
I have done something similar to this in the past.
My solution to this would be to make use of Unity's new UI Mask and a Render Texture.
When the player touches the screen you would draw a circular …