![]() Instead of a glass of water, here we use a Fresnel prism, consisting of thousands of tiny facets. Everywhere else, the background is seen by total internal reflection (TIR). Light Strokes uses an optical effect you may have noticed when looking down through a glass of water and seeing just your fingertips against the side of the glass. You can see it in action on prototype hardware in the first video. The hardware works in combination with the Light Strokes app, available for free from the App Store. It shows how to build the Light Strokes hardware that enables digital painting on the iPad using actual brushes, sponges, rags, or almost anything you'd care to paint with. ![]() Digital painting apps provide some amazing simulated brushes, but if you miss the expressiveness of painting with real brushes and other physical tools, then this Instructable is for you.
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