Halftone Grid effect creates a matrix of images. The image was originally made to mimic the halftone grid patterns, hence the name.
Basically the effect takes very small image as input (scroll image), and for each pixel in that image it display another image (dot image). The color and opacity in the scroll image can be used to control the size and color of each dot rendered. Finally the scroll image is scrolled horizontally over time.
The produced dot pattern can be masked using a mask image. The mask image is the same size as the displayed matrix. The mask image is not scrolled, but the values in the scoll image are multiplied by the values in the mask image. Which means, that the mask image dims or fades the scrolled image.
To allow more complex display, the matrix or grid can be twisted using control points. The control points defines a curve and the matrix is shaped along that.
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