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Animating a straight line

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John Epton

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Animating a straight line

PostWed Oct 26, 2016 7:47 am

Can anyone please advise me how to draw a visible straight line and then animate the line's end points?
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multiabhay

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Re: Animating a straight line

PostWed Oct 26, 2016 8:06 am

If it's a 2d line, create a paint node then draw a polyline stroke then go to the properties editor, open stroke control and play with or animate write on sliders

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Adelson Munhoz

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Re: Animating a straight line

PostWed Oct 26, 2016 10:59 am

Hi John,

if you want to animate the position of the end points of a Polyline Stroke, you must publish them first.

Right-click on them and navigate until the option Publish Points.

The Shift-P is also a shortcut for this.
Clipboard01.jpg
Clipboard01.jpg (145.12 KiB) Viewed 8117 times


Then you have access to the points XY position inside the Modifiers Tab. See the published points at the bottom:

Clipboard02.jpg
Clipboard02.jpg (87.52 KiB) Viewed 8117 times


You can now animate or link this points to anything you want.
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Alaz Soytemiz

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Re: Animating a straight line

PostWed Oct 26, 2016 1:09 pm

Best way is in the krokodove toolset: grow
https://vimeo.com/channels/krokodove/56937468


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John Epton

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Re: Animating a straight line

PostSun Oct 30, 2016 8:26 am

Thanks to you all. Very helpful.
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Marek Klucar

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Re: Animating a straight line

PostSat Jun 17, 2017 1:26 pm

multiabhay wrote:If it's a 2d line, create a paint node then draw a polyline stroke then go to the properties editor, open stroke control and play with or animate write on sliders

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How about in 3D? I need to make a visible line attached to two 3D objects.
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Sander de Regt

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Re: Animating a straight line

PostMon Jun 19, 2017 8:46 pm

Then you're probably best off by creating a very thin cylinder stretching from point A to point B.
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Bryan Ray

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Re: Animating a straight line

PostMon Jun 19, 2017 9:28 pm

Ribbon3D might be easier to control, as it lets you set coordinates at both ends instead of having to rotate a cylinder to point at the second object. You can do some cleverness with an opacity ramp to make it look like it's growing, as described here:

https://www.steakunderwater.com/viewtop ... 9406#p9406
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Sander de Regt

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Re: Animating a straight line

PostMon Jun 19, 2017 9:34 pm

I always forget about Ribbon 3D. Good point Bryan. Marek, you should listen to Bryan. ;)
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Marek Klucar

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Re: Animating a straight line

PostTue Jun 20, 2017 2:59 pm

Thank you for suggestions! I ended up using ribbon however it's not ideal solution as I could not have rounded ends. Instead it has these pointy edges.

Also without antialiasing enabled I had some nasty aliasing happening, and with antialiasing enabled I had some dark edges appearing on the green line.

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