Fuse Help Patch Optical Flow - Bug?

[vincent.now]

Hello,

I have been working with the Fuse help patch “Use Optical Flow for Emission” and changed the video input. It seems to me that the coordinates are not mapping correctly. This is what I get:

You can clearly see the silhouette of the church, and from the screenshot you can also see that there are motion vectors around the building. However, the resulting image doesn’t seem to apply the optical flow texture in the correct position.

It looks as if there is some kind of mismatch between the optical flow coordinates and the image coordinates.

Is there something I need to change or remap to make them align correctly?

Thanks a lot!

[vincent.now]

ah, uh … found it!

… well done me !

[SuperflysiNZ]

Something else I found with this, if you flip the green the optical flow goes the correct direction when movement in the y axis, left right works, but up down movement was pushing the particles in the opposite direction.