Question Fade previous frames over time

Hi there,

I'm using URP and a Scriptable Render Feature.
I'm rendering some objects with a specific layer but I can't achieve to make them fade over time.
You can think of some kind of ghosting effect or this example where thje previous frames are accumulated and slowly disappear over time.


Any idea about how to achieve this kind of effect ?
Thanks a lot !

 

is it a 2D or a 3D effect that you are looking for?
I mean if you rotate the camera, you expect the trail to show a volume or the effect is on the camera itself?

 

This is a 3D effect but for the moment I focus on a fixed camera position and wonder how I need to organize all RenderTargetHandle, Blits, etc. in the Configure and Execute functions.

 

If it's a 3d effect learning the 2d version won't help, they work differently. The 2d is done through accumulation buffer, that's old school motion blur. The 3d is done by duplicating mesh and have a transparent trail of them, done in shenmue, it allow you to turn around the effect, but is fillrate intensive.

 

Indeed @neoshaman is right, a 2d effect will be some kind of a motion blur and will not translate into 3d.

if you want to simply do a ball bounce, i would suggest you to use a trail.
Or duplicate other instances of the object and fade it with transparency or dithering

if you want to go further, you can always check what Keijiro is doing:
https://github.com/keijiro?tab=repositories
https://github.com/keijiro/Smrvfx