Hallo, Nicolas Montgermont hat gesagt: // Nicolas Montgermont wrote:
I've been experimenting pmpd with datastructure for a week now, and I encounter a few problems that are all present in the attached patch:
- Computation speed! The simple model presented here (5 mass, 8 link)
seems to charge all my CPU at a metro period of 100ms. The string patch designed by Frank Barknecht in the datastructure tutorial was much more faster. Does anybody see any "bad" programming in the patch?
I tried various things now but the only thing that really helped is, to hide the data structure display, e.g. by switching GOP off for bonhomme.pd. Then CPU usage drops by a huge amount. So it's definitely the graphical updates, that kill performance here.
Anyway what I tried is this: I removed a lot of traversing inside model-setter.pd so it now just stores the correct pointer once on initialization. For that, I added a $0-INIT receive target, which is bang'd in the structure subpatch after the data structres are created.
Performance-wise it didn't help at all, but this approach might be useful for larger structures.
Another test I did was in the opposite direction: I suspected, that maybe access to the array data is slowing things down. So I added another field to the mass-struct for color. I then colorized the movable mass on the house's roof. ;)
You can find the result in the "evenslower" subdirectory. Now this simple little change is totally exhausting my machine. Pd (0.38) isn't able to render the animation at all anymore when I try to move the now red dot.
- The datastructure displays strangely on my linux system. Some links
are well connected to the mass, but the others present a kind of offset. Even if the same abstraction is use to display all of them. It seems to be a recurrent problem with the datastructure already discuss in the GoP positions thread. Have you any newer explanations and perhaps solutions ;) ?
I moved over the masses' display by 5px to the right, which looks better but still is off for some links. Deeper investigation needed...
Ciao
Frank Barknecht _ ______footils.org__
_ __latest track: "scans" _ http://footils.org/cms/show/41