Checking Animated checkbox does not do what is documented. #64876

New Issue

alex anguix · 2019-05-20T13:34:40+02:00

alex anguix commented

2019-05-20 13:34:40 +02:00

System Information
Operating system: MacOS 10.13.6
Graphics card: NVIDIA GeForce GT 750M 2048 MB

Blender Version
Broken: (example: 2.80, edbf15d3c0, master, 2018-11-28, as found on the splash screen)
Worked: (optional)

Short description of error
Checking "animated" on RigidBody reverts transforms to the initial value.

Exact steps for others to reproduce the error

Add Rigidbody to an object
Allow it to fall and settle on floor

Add 2 Keyframes to Animated checkbox, going from Unchecked to Checked

The rigidbody goes all the way back to its initial transform up high.

Unable to manually set transform based on simulation because the transform values remain at the original values throughout whole simulation.

System Information Operating system: MacOS 10.13.6 Graphics card: NVIDIA GeForce GT 750M 2048 MB Blender Version Broken: (example: 2.80, edbf15d3c044, master, 2018-11-28, as found on the splash screen) Worked: (optional) **Short description of error** Checking "animated" on RigidBody reverts transforms to the initial value. **Exact steps for others to reproduce the error** - Add Rigidbody to an object - Allow it to fall and settle on floor # Add 2 Keyframes to Animated checkbox, going from Unchecked to Checked The rigidbody goes all the way back to its initial transform up high. Unable to manually set transform based on simulation because the transform values remain at the original values throughout whole simulation.

alex anguix commented

2019-05-20 13:34:40 +02:00

Added subscriber: @alexang

Bastien Montagne commented

2019-05-20 14:40:42 +02:00

Added subscriber: @mont29

Bastien Montagne self-assigned this 2019-05-20 14:40:42 +02:00

Bastien Montagne commented

2019-05-20 14:40:42 +02:00

This should not be animatable at all, it is a key setting of the whole simulation, changing it will reset it completely…

blender-admin commented

2019-05-20 14:47:15 +02:00

This issue was referenced by 49f530c7da

This issue was referenced by 49f530c7da6bd117c4b373307eb646d513538526

Bastien Montagne commented

2019-05-20 14:51:44 +02:00

Changed status from 'Open' to: 'Resolved'

Bastien Montagne closed this issue

2019-05-20 14:51:44 +02:00

alex anguix commented

2019-05-20 15:51:47 +02:00

Please do not close this!

This absolutely is intended to be animateable. See the documentation:
https://docs.blender.org/manual/en/latest/physics/rigid_body/tips.html#animation
https://docs.blender.org/manual/es/dev/physics/rigid_body/tips.html#animation

The most common trick is to keyframe animate the location or rotation of an Active physics object as well as the Animated checkbox.When the curve on the Animated property switches to disabled, the physics engine takes over using the object’s last known location, rotation and velocities.

Imagine a scenario where you want to run a simulation and let a group of items fall. Then you want to take over and animate 1 object from it's simulated position/rotation/scale towards the camera. Then placing it back onto the pile, and letting the physics take over. This is a common animation task for motion-graphics style videos.

Please do not close this! This absolutely is intended to be animateable. See the documentation: https://docs.blender.org/manual/en/latest/physics/rigid_body/tips.html#animation https://docs.blender.org/manual/es/dev/physics/rigid_body/tips.html#animation > The most common trick is to keyframe animate the location or rotation of an Active physics object as well as the Animated checkbox.**When the curve on the Animated property switches to disabled, the physics engine takes over using the object’s last known location, rotation and velocities.** Imagine a scenario where you want to run a simulation and let a group of items fall. Then you want to take over and animate 1 object from it's simulated position/rotation/scale towards the camera. Then placing it back onto the pile, and letting the physics take over. This is a common animation task for motion-graphics style videos.

Bastien Montagne commented

2019-05-20 16:01:44 +02:00

Ah, OK, my mistake… but then what is the issue here? That object goes back to its place when you re-enable the 'animated' setting? that sounds like totally expected to me…

blender-admin commented

2019-05-20 16:02:00 +02:00

This issue was referenced by 9cc795e1df

This issue was referenced by 9cc795e1df0e04d05eea900829511255d96d6f90

alex anguix commented

2019-05-20 16:24:09 +02:00

Actually, the documentation mentions what happens going from Animated on to Animated off.

I assumed keyframing the Animated checkbox from Off to On would have the opposite effect. Meaning that it would set the transform to it's last calculated transform from the physics simulation.
But this isn't the case.

Looks like the only solution is to bake the entire physics simulation and then modify all keyframes.

Actually, the documentation mentions what happens going from Animated on to Animated off. I assumed keyframing the Animated checkbox from Off to On would have the opposite effect. Meaning that it would set the transform to it's last calculated transform from the physics simulation. But this isn't the case. Looks like the only solution is to bake the entire physics simulation and then modify all keyframes.

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Checking Animated checkbox does not do what is documented. #64876

Add 2 Keyframes to Animated checkbox, going from Unchecked to Checked