Reinventing Feathering for the Vectorian Era

https://rive.app/blog/how-rive-reinvented-feathering-for-the-vectorian-era

by interpol_p • 1 year ago

70 10 1 year ago

cjbgkagh2• 1 year ago

The 2D Gaussian blur is separable into 2 1D convolutions which is much faster than the 2D version so less of a performance issue.

tczMUFlmoNk• 1 year ago

Not just that, but two 1D iterated box blurs, requiring an amount of work per pixel that is constant with respect to the blur radius—as opposed to quadratic for the naive convolution, or linear for the 2D-to-1D transformation with a full Gaussian kernel.

http://elynxsdk.free.fr/ext-docs/Blur/Fast_box_blur.pdf

cjbgkagh2• 1 year ago

Neat didn’t know that.

ajb• 1 year ago

Not completely buying this. He's claiming that it's better to do vector based feathering, but it's not at all clear that his approach isn't just as computationally expensive, or more. Filters do require a lot of calculations, but they are embarrassingly parallel and also you get help from the Convolution Theorem.

The5thElephant• 1 year ago

Looking at the performance it's quite clearly much faster than equivalent effects done in traditional web browser rendering or in design tools.

zokier• 1 year ago

I'm confused, can't you accomplish the same effect with simple gradient (+ offset)?

tobr2• 1 year ago

What do you mean with a ”simple” gradient? The difficult part is that it has to follow not just the outline of the shape, but also the average color of the shape around a certain point. That must get very tricky with arbitrary shapes.

tobr2• 1 year ago

Right about when I’d expect it to get into the interesting technical details, the article pivots to marketing fluff. Hoping for a follow-up that dives in.

rikroots• 1 year ago

You can achieve a gaussian blur effect using an infinite impulse response thing[1]. Some very clever people at IBM came up with the idea, and some other very clever people translated that code to Javascript and stuck it on GitHub for the rest of the world to use[2].

[1] https://en.wikipedia.org/wiki/Infinite_impulse_response

[2] https://github.com/nodeca/glur

B1FF_PSUVM• 1 year ago

I'm a bad person who read too many old comics - I thought this was a Victorian history snippet about tar-less "tarring & feathering", perhaps with honey for a gourmet twist ...

Reinventing Feathering for the Vectorian Era

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