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enter image description hereI have been trying my hand at animating with grease pencils, but found that keyframes do not behave with grease pencils as they do with standard meshes. When you put a keyframe for the clouds in this picture for changing positions, it doesn't gradually calculate the position change from keyframe to the next keyframe like you would expect. Instead, it just jumps to the next position only when it hits the frame where you made the next keyframe. Kinda complicated, but here is a snapshot. enter image description here

enter image description here

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So a youtube suggested video showed how there is an interpolate button in the Grease Pencil Left Panel. This allows blender to calculate frames between keyframes. Here is a link to the video. https://www.youtube.com/watch?v=jULE3Gohi9I

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Under the dope sheet or graph editor "key" tab, make sure that the interpolation mode is set to either "linear" or "bezier". It might be that the default interpolation mode for grease pencil objects is constant. Constant is what makes the animation jumpy. (If you want to be able to change the acceleration at different times for the objects, choose bezier because then in the graph editor you can grab the little handles and rotate them, changing the acceleration/deceleration speeds)

Hope this works!!

Here's a picture
(source: blender.org)

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  • $\begingroup$ K, I see the point, but for some reason. The dope sheet shows key frames, but the F-Curve does not. I will add a photo up above in order to help you understand what I try to explain. $\endgroup$ – jake_314 Feb 10 '18 at 3:17
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    $\begingroup$ Hmm yeah I see what your saying. I'll see if I can find why that is $\endgroup$ – Linguini Feb 10 '18 at 3:49
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    $\begingroup$ I tried just converting grease drawings to meshes that have easing enabled, but that just isn't practical. Maybe Blender isn't meant for 2d animation. Thanks for the help. $\endgroup$ – jake_314 Feb 10 '18 at 15:15
  • $\begingroup$ No problem! I didn't end up finding out what u were asking about, but I did stumble across an add-on called COA Tools, and that might help. I haven't personally tried it, but it might suit your needs. blendernation.com/2016/03/10/cut-animation-tools-overview $\endgroup$ – Linguini Feb 12 '18 at 2:42
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    $\begingroup$ Thx, I think the link you sent me is not intended for grease pencil, but I think I found a way to import images in as plane meshes. Even though blender claims now that their grease pencil animation tool is amazing, it seems to lack basics like interpolation. I'll just have to use meshes. Thx for helping out though. $\endgroup$ – jake_314 Feb 12 '18 at 2:46
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You need to move you timing mark between the two keyframes you want to smooth in your "Grease Pencil" dopesheet - then select strokes-> interpolate ->sequence in "draw" mode up top. It will

After doing so - it will add weird little blue markers on the dopesheet.

enter image description here

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I'm trying to make a video, with the help of some tutorials so far I have overcome almost all obstacles but now I have a problem with the use of keyframes: for example I move clouds of smoke coming out of the chimney of a train, the clouds get bigger and bigger and move to the opposite side to the direction of the train ...... OK, but I can't make the last clouds disappear because if I decrease the opacity of the last drawn cloud, the effect applies it to all keyframes. Can you help me? Thank you.....

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  • $\begingroup$ Through the Keyframes I am able to make the drawing move and to vary the size of the objects designed, but I cannot convey the opacity, that is, something that becomes gradually invisible. $\endgroup$ – Salvo Pirrello Feb 13 at 15:36
  • $\begingroup$ You you are fading away by keyframing opacity on the material, since all objects share the same material all get the same simultaneous transparency. $\endgroup$ – Duarte Farrajota Ramos Feb 13 at 16:40

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