v002 OpticalFlow

[franz]

Hi,
I’m trying to connect your OpticalFlow plugin with my own Particle stuff.
So far I understood that R and G code movement on the X axis ( R is X positive, G is X negative).
How about the Y axis ?
thanks.
Great plug. by the way, good performance !

[vade]

B and A 🙂

[franz]

then something must be wrong in my plugin, as i can’t get B working (while A produces expected result)

[vade]

What machine are you on? I did notice a bug on my i7 MBP (NV 330m) where it was not outputting as expected. I need to see whats up 🙁

[franz]

I’m on a MBP core2 + 9600.

I’m using a bufferRep to grab your OFlow image, QCPlugInPixelFormatRGBAf , kCGColorSpaceGenericRGBLinear.

I grab pixels that way:

R = baseAddress[4*x+y*floatsPerRow];
G = baseAddress[4*x+1+y*floatsPerRow];
B = baseAddress[4*x+2+y*floatsPerRow];
A = baseAddress[4*x+3+y*floatsPerRow];

R,G and A works, but not B ….

EDIT:
i’ve logged the values, and B is always negative… (?)
R and G can range beyond 1 , but A always tops at 1.

[franz]

i just released the plugin I’m talking about, so you can see by yourself…
I’ll double check however, to see if it doesn’t come from my side.
(but I’ve no clue where i could have been wrong)

[vade]

I dont doubt you. It may be a bug. I have not had a chance to look at it yet, to be honest.

[bangnoise]

seriously nice particles Franz. One or the other of us will get to it when we can – or the source is included with the plugin if you want to take a look yourself.

[Author]

Posts