New answers tagged normal-mapping
This effect is likely done with blending modes. http://blogs.adobe.com/webplatform/2014/02/24/using-blend-modes-in-html-canvas/ You would create a gradient light texture like: and set the composition/blending mode to either additive or multiply (or some other mode for a different effect) and then draw it on top of the area you want lit up. I'll see if i ...
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