Re: [Algorithms] FPS Questions

[Jim O. <j.o...@in...>]

> you can use a accumulation buffer (or t buffer) to do proper motion
blur...
> there's nothing that prevents you from using it to do the averaging of the
> multiple frames for each displayed frame, and that's probibly the best way
> to go about it.

To simulate motion blur, rather than average a few frames, shouldn't we have
a function like:

P(1) = R(1) - C * P(0)

Where P(0) and P(1) are the color values of some pixel in the (accumulation)
buffer at t = 0 and t = 1 and R(1) is the color value for the same pixel,
resulting from the rendering of a frame at t = 1. C is a constant, which
controls the decay of light / the amount of motion blur.

Note that P(2) = R(2) - C * P(1) = R(2) - C * (R(1) - C * P(0)) and so forth
for P(3) to P(n).

Probably (and I am guessing here), C shouldn't be a constant at all, but
rather dependent on the velocity (both linear and radial) of the viewer, as
I think that motion blur increases with velocity.

Jim Offerman

Innovade
- designing the designer