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Tech

Updating F-Curves

16th August 2017

info License: CC-BY
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Published by

Sybren A. Stüvel

This is the first video in a series of "tech videos" in which Sybren discusses concrete problems seen on Stack Exchange. This video is all about modifying animation data from Python scripts.

  • Use ctrl+space to find actions and F-curves
  • Evaluate F-curves for a frame without going to that frame
  • Adjust existing keyframes
  • Calling fcurve.update() after making changes

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8 Comments

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<deleted>

13th September 2020 - 10:37

for lazy ones as me:

import bpy
reset_to = 1.0
for object in bpy.context.selected_objects:
    # in case the object is not animated, we should also change its y-coordinate
    object.location.y = reset_to
    if not object.animation_data or not object.animation_data.action:
        # no action so nothing to do
        continue
    action = object.animation_data.action
    fcurve = action.fcurves.find('location', index=1)
    if not fcurve:
         # y location not animated so nothing left do
         continue
    for keypoint in fcurve.keyframe_points:
        keypoint.co.y = reset_to
    fcurve.update()

Sybren very nice video,

I am missing only how to insert a new keyframe at say time 60 in the timeline ...

As the title says: existing ke;yframes , so my wish is something new ;-)

oh oh the triple ` does not as im MD.

Possible here? If so, please tell me Greets Peter

delete Delete

Henk Kok

7th February 2021 - 15:03

@Peter K.H. Gragert ah yes, lazy indeed, thanks :-)

Henk Kok

7th February 2021 - 16:09

@Peter K.H. Gragert From what I found,  keypoint.co.x  represents the frame number

Training ODW

30th August 2017 - 03:25

Very nice explanation! Thank you Dr.

Henk Kok

23rd March 2020 - 17:40

Thank you once again Sybren, this wasn't easy to figure out alone but with this tutorial a n entire array of possilibities is opened up to me.

Julian Darley

5th November 2018 - 22:15

is there a blend file containing the suzanne animation that is being corrected here?

santokio

9th August 2020 - 11:53

still waiting for tech9ne

Henk Kok

2nd January 2023 - 15:11

For the record, from time to time I return to pick a few things again from this. Today I remembered that curves could be evaluated so I went back and behold, its there. Great and helpful tutorial, thank you!