Peter Nyboer

I've managed to alter "twine ball" recipe to a nice sort of "ribbon" drawer, using the mouse. However, I'm getting some animated artifacts that I don't quite understand - I'm hoping for some illumination...

As I draw the ribbon, it jerks and vibrates on occasion. It appears that it's getting confused as to the orientation on the bends and turns, and will seem to flip the entire ribbon along it's "spine".

Is there a way to avoid this or it is just an oddity of trying to animate this stroke drawing?

I've managed to alter "twine ball" recipe to a nice sort of "ribbon" drawer, using the mouse. However, I'm getting some animated artifacts that I don't quite understand - I'm hoping for some illumination...
As I draw the ribbon, it jerks and vibrates on occasion.  It appears that it's getting confused as to the orientation on the bends and turns, and will seem to flip the entire ribbon along it's "spine".
Is there a way to avoid this or it is just an oddity of trying to animate this stroke drawing?

draw-with-gl-stroke-in-sketch-issue

> I've managed to alter "twine ball" recipe to a nice sort of "ribbon" drawer, using the mouse. However, I'm getting some animated artifacts that I don't quite understand - I'm hoping for some illumination...

> As I draw the ribbon, it jerks and vibrates on occasion. It appears that it's getting confused as to the orientation on the bends and turns, and will seem to flip the entire ribbon along it's "spine".

> Is there a way to avoid this or it is just an oddity of trying to animate this stroke drawing?

I've had a good look at your patch and couldn't find the problem, but it 

does remind me an awful lot about a a problem I had in a different patch 

What I was drawing quad-based lines in 3d, also using jit.gl.sketch. The 

patch was designed to auto-delete early entries in the cmdlist, 

essentially doing the same thing as in the splines example - what 

happened whenever part of the cmdlist was deleted looked *exactly* like 

the jerkiness of the splines in your patch - the path of the "string" 

Don't know if this helps, just wanted to show my support, really. Looks 

pnyboer skrev:
> I've managed to alter "twine ball" recipe to a nice sort of "ribbon" drawer, using the mouse. However, I'm getting some animated artifacts that I don't quite understand - I'm hoping for some illumination...
> As I draw the ribbon, it jerks and vibrates on occasion.  It appears that it's getting confused as to the orientation on the bends and turns, and will seem to flip the entire ribbon along it's "spine".
> Is there a way to avoid this or it is just an oddity of trying to animate this stroke drawing?
Hi Peter,
I've had a good look at your patch and couldn't find the problem, but it 
does remind me an awful lot about a a problem I had in a different patch 
of mine:

What I was drawing quad-based lines in 3d, also using jit.gl.sketch. The 
patch was designed to auto-delete early entries in the cmdlist, 
essentially doing the same thing as in the splines example - what 
happened whenever part of the cmdlist was deleted looked *exactly* like 
the jerkiness of the splines in your patch - the path of the "string" 
would be recalculated differently.

Don't know if this helps, just wanted to show my support, really. Looks 
like a really promising patch!

draw with GL stroke in sketch issue...