Auto Execution "Always" gives flickering on Subdivide modifier

[enzyme69]

I am using "Auto Execution" as Always. All I have in the scene is a Box with

• Skin Modifier
• Subdiv Modifier
• Using Object Attribute Output, I am changing >> modifiers["Subsurf"].levels

I am getting Flickering mesh with Auto Execution.
When I use Property Changed tick box, the flicker disappear.

Now, I am curious on New Trigger. I will have to check that.

But I think even with "Always", it should not flickering.

[JacquesLucke]

Hm, I guess you don't change the vertices all the time? This looks a bit like a bug in the Skin Modifier. Will check in more detail when I'm at home.

[JacquesLucke]

https://developer.blender.org/T48937

[og76]

fwiw
this is not the only place you'll encounter "different outputs for same input" behavior, more like a random choice between equivalent solutions, eventually leading to flicker in Animation Nodes or other repeated execution case.

However, do notice that auto execution just repeats the exec every x seconds.
Evwn if without it things seam ok, well, they are not if u are animating. On each frame the solution will be random, so it will flicker ...

Another example that comes to mind is bvh closest where if the closest point is on an edge, the returned polygon index will.. flicker, being sort of a random choice between those 2 poly.
(one of the reasons for the extra normal check I was doin on the "is inside volume - normal based" version. extra checks that eventually made it sloow.. )

There are other cases for this, (marginal or weird or not), but do not remember now
and, sorry, time is not on my side these days. :(

ps.
solutions? hm, it so depends on the specific case. in some cases a certain tolerance (or on the contrary, precision) may help "fix" the result ... or more "fixed"

[enzyme69]

​Yes, I guess it can be a bit tidier. In fact, I still wonder why the Mesh output from AN still cannot be "Shade Smoothed". It's always goes back to non smooth.

[og76]

w do you mean "goes back"?

also..

[enzyme69]

Ok, I think that might have been fixed at some point I probably was using
older version. I recalled having this "issue":

1. Original Suzanne
2. Instance Copy Suzanne, Shade Smooth, and it goes to smooth and playback,
   it goes back to Shade Flat.

I tried it just now, the copy when smoothed, it affects the original
Suzanne. Which is weird too. But I tested again and it is not affecting
original Suzanne. I tested with this switches on and off: Deep Copy, Copy
Full Objects, Copy from Source.

But, probably has been fixed. And thanks for pointing that "Shade Object
Smooth" node. I didn't know.

Anyhow, the flickering thing happens sometimes when I subdivide mesh
outputted from AN. It is unexpected behaviour, I reckoned.

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On 24 July 2016 at 11:11, og76 notifications@github.com wrote:

w do you mean "goes back"?

also..
[image: smooth]
https://cloud.githubusercontent.com/assets/11709974/17081121/99e0e198-5154-11e6-985b-1fe50429a525.PNG

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[JacquesLucke]

Close it because it is a bug in Blender.