would I create a shader like the one used in there?
(The smooth colour transitions that look like some kind of plasma)
I’m guessing this might be some kind of additive blending, but can
someone tell me more?
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It looks like the streaks are written to a texture as the ball passes
over it, using a linear gradient perpendicular to the ball vector. The
blue and green channels gradually fade out over time. The green channel
fades out quicker than the blue, which causes the cyan colour trailing
the balls to disappear leaving only the blue channel that fades out much
Hmm, thanks for the hints. So I could just write the colours away to a
buffer as the objects pass over it, and fade those colours out over
Cool, but what about the spread effect?
The easiest way to create that sort of effect is, instead of clearing
the screen, draw a fullscreen alpha blended quad over the top.
Or to make the effect more exciting, grab the backbuffer, run a blur
filter over it, then alpha blend that over the top instead of clearing
You can even make different colours fade at different rates by changing
the draw colour.
The spreading is likely a Gaussian blur pass being run on the background
texture each frame.