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p2or / blender-loom

image sequence rendering, encoding and playback
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Slow motion speed change #3

Closed AndreaMonzini closed 1 year ago

AndreaMonzini commented 6 years ago

Would be possible to animate the speed change for the slow motion?

Example: 1.0, 1.1, 1.3, 1.6, 2.0, 2.5, 3.1, 3.8, 4.6, 5.5, 6.5 ... To create a ramp for the speed.

Using the graph editor would be ideal like: https://github.com/hxxr/time-remapper

Thank you.

p2or commented 6 years ago

Hi Andrea,

I really like the idea using the graph editor to draw a curve and use that information for rendering. Theoretically that's also easy to implement based on the existent Render Selected Keyframes operator and by resampling the curve.

However the problem is, even No Auto Snap is selected in the Graph Editor there is currently no way setting the timeline cursor to the actual frame as well as no way snapping the points to an even (rounded) number right? If so, I think aligning the curve properly can be time consuming and in especially frustrating at the end.

Any ideas how to deal with that issue?

Cheers, Christian

AndreaMonzini commented 6 years ago

Hello, i do not know if it can help but i see that there is an option in graph editor "Jump to Keyframe" "CRL+G" that correspond to bpy.ops.graph.frame jump(). I just started to learn Python...

Here you can find more info about graph editor and time remapping by @Garrett-R: https://blender.stackexchange.com/questions/1053/how-do-i-animate-time/7799#7799

where @ideasman42 suggested to use fcurve to animate time for bpy.context.scene.frame_set()

so @Garrett-R developed: https://github.com/Garrett-R/time-remapper and then it was forked more recently by @hxxr: https://github.com/hxxr/time-remapper

Create the speed ramp directly with 3D rendering would be ideal, otherwise using the VSE or optical flow alternative like slowmoVideo ( great GPL software ) can create artifacts.

https://github.com/slowmoVideo/slowmoVideo