Show HN: Vector Video • Hacker News Board

Re: Show HN: Vector Video

#21

Post by anoother » Fri, Oct 07, 2016, 7:44 PM UTC

SuperPaintMan wrote: post #17

anoother wrote: post #8

If the OP is reading this... Try animating a large cube moving into the logo, and using the boolean subtract modifier between each mesh and this cube. Place the cube on another (invisible) layer, et voila. You can leave your camera fixed in the same place, too. EDIT to add: I should have mentioned, I think this is a very cool idea! I might just steal it one day ;)

Need to run off to work at the moment but I'll give it a shot. Wouldn't you need to move two cubes through the mesh leaving a small space to be drawn? Steal it by all means!

Don't think so, unless I'm misunderstanding what you have.

I basically mean replacing your animated camera with the cube, but still using a [fixed] orthographic camera to look at the face of the solid as the cube cuts it away.

I tried using your scripts but Meshlab on my system really doesn't like the data and refuses to produce any output :(

Re: Show HN: Vector Video

#22

Post by semi-extrinsic » Fri, Oct 07, 2016, 8:52 PM UTC

dandelany wrote: post #20

bhouston wrote: post #13

Usually people motion interpolation: https://en.wikipedia.org/wiki/Motion_interpolation There are some really perfect algorithms out there for this. And they also do upscaling via a high quality sinc filter: https://en.wikipedia.org/wiki/Whittaker%E2%80%93Shannon_inte... The main issue you have is gif artifacts from the extreme color quantization. Something like this might help: http://citeseerx.ist.psu.edu/viewdoc/d…

Yes - OpenCV is a good resource for experimenting with motion interpolation as they implement a few different algorithms: http://docs.opencv.org/2.4/modules/video/doc/motion_analysis... I've had the most success with the Farneback algorithm. There's even a nice CLI utility called Butterflow which wraps ffmpeg+OpenCV Farneback, and allows you to interpolate video with a one-liner on the command line: https://github.co…

That looks amazing, Butterflow goes straight in my toolbox.

Re: Show HN: Vector Video

#23

Post by SuperPaintMan » Fri, Oct 07, 2016, 9:19 PM UTC

anoother wrote: post #21

SuperPaintMan wrote: post #17

Earlier quoted context omitted.

Need to run off to work at the moment but I'll give it a shot. Wouldn't you need to move two cubes through the mesh leaving a small space to be drawn? Steal it by all means!

Don't think so, unless I'm misunderstanding what you have. I basically mean replacing your animated camera with the cube, but still using a [fixed] orthographic camera to look at the face of the solid as the cube cuts it away. I tried using your scripts but Meshlab on my system really doesn't like the data and refuses to produce any output :(

MeshLab is finicky, when it can't apply a filter it simply crashes. Best to import the points manually and tweak your filters in the main app. Then you can export the filter script through the filter menu. Launching from a terminal allows tracing of what exactly failed.