SXRadialBlurFilter

membersheep

http://wiki.sparrow-framework.org/extensions/sxradialblurfilter

I created a radial blur filter (useful for fast zooming effects and similar). It's far from perfect because it's based on a simple but fast (only 1 pass) algorithm, but it's alright, as long as it's used while zooming no one will notice its imperfections.
Everyone is welcome to improve it!

EDIT: ...and to tell me if I did something wrong, I'm noob about shader programming.

Daniel

Awesome! Great work, Alessandro!

I took the liberty of adding a screenshot to the wiki, and two add to notes on the usage. BTW: you might want to make use of the "marginX/Y" properties of the base filter class to make sure the effect is not cut at the sides. On the other hand, users can always manually update those properties.

Thanks a lot for sharing that filter! 🙂

membersheep

Thanks for the notes!
I will update it asap.
I noticed that if I apply the filter to a sprite composed with many images the rendering stops, is it normal?
Also, if I scale the display object the fps rate goes down and the app quickly crashes. The shader program seems fine but maybe I'm doing something wrong with the configuration. I have to try again with the built in blur filter that seemed to ha e the same problems.

In my current app I solved it by rendering the screen in a texture, apply the filter, cache it and finally zoom in. This way seems to work fine and quick but I can't apply it to a sprite with moving images. Maybe it's also due to ipad2 limitations.

Daniel

Could you explain a little more what you mean when you say "the rendering stops"? That shouldn't happen, actually. :-/

Filters are not cheap, performance-wise, because they always require one (or more) additional render steps and require the GPU memory for the render steps.

Have you tried the "cache" method of the filter? That would render the filter only once and then keep the result. When the object changes, you can call "cache" again to refresh it.