Speeding up using VSE effects rotation of particles #48361

New Issue

Mike Futcher · 2016-05-06T17:03:04+02:00

Mike Futcher commented

2016-05-06 17:03:04 +02:00

System Information
I have tried this on multiple machines, running both Windows 7 and Windows 8

Blender Version
2.76b & 2.77
Worked: (optional)

If I use the VSE Speed Control to adjust the speed of a scene it effects the angle of particle objects

Exact steps for others to reproduce the error

I've a few extras so you can see what you're doing better.

bugreport - particles n speed control.blend

Open Blender and delete the cube

Add a plane
Move it up a little so you can see what you're doing better
and add another plane (Plane.001)

On the second plane (Plane.001), create a new particle system
In the Render panel, set the particles to appear as Objects, Set the object to Plane
Turn the size up to 0.2 so that you can see what you're doing better
Bake the particle sequence

When you play the animation, you will see that the particles are planes that are all parallel to the plane that is emitting them.

Create a new scene - myself I like to call this scene "edit"
In the new scene, go to video editing view
Go to the timeline and add the scene "Scene" to the timeline (the first scene, with the particle system of planes in it)
Add a "Time Remap" effect to the scene
Grab the right hand handle of the scene, and drag to the left to speed up the scene

Now play. Or render. You will notice that the rotation of the particles has changed. They now rotate as they fall.

This also works if the particle is set to Group rather than Object.

**System Information** I have tried this on multiple machines, running both Windows 7 and Windows 8 **Blender Version** 2.76b & 2.77 Worked: (optional) If I use the VSE Speed Control to adjust the speed of a scene it effects the angle of particle objects **Exact steps for others to reproduce the error** I've a few extras so you can see what you're doing better. [bugreport - particles n speed control.blend](https://archive.blender.org/developer/F309602/bugreport_-_particles_n_speed_control.blend) Open Blender and delete the cube Add a plane Move it up a little so you can see what you're doing better and add another plane (Plane.001) On the second plane (Plane.001), create a new particle system In the Render panel, set the particles to appear as Objects, Set the object to Plane Turn the size up to 0.2 so that you can see what you're doing better Bake the particle sequence When you play the animation, you will see that the particles are planes that are all parallel to the plane that is emitting them. Create a new scene - myself I like to call this scene "edit" In the new scene, go to video editing view Go to the timeline and add the scene "Scene" to the timeline (the first scene, with the particle system of planes in it) Add a "Time Remap" effect to the scene Grab the right hand handle of the scene, and drag to the left to speed up the scene Now play. Or render. You will notice that the rotation of the particles has changed. They now rotate as they fall. This also works if the particle is set to Group rather than Object.

Mike Futcher commented

2016-05-06 17:03:04 +02:00

Changed status to: 'Open'

Mike Futcher commented

2016-05-06 17:03:04 +02:00

Added subscriber: @MikeFutcher

Sergey Sharybin commented

2016-05-17 11:14:56 +02:00

Added subscriber: @Sergey

Sergey Sharybin commented

2016-05-17 11:14:56 +02:00

Changed status from 'Open' to: 'Archived'

Sergey Sharybin closed this issue

2016-05-17 11:14:56 +02:00

Sergey Sharybin self-assigned this 2016-05-17 11:14:56 +02:00

Sergey Sharybin commented

2016-05-17 11:14:56 +02:00

Particles are really fragile, especially when you're trying to skip frames in their evaluaiton (which is exactly what speed effect does).

We are planning to drop current implementation of particles and rething it all globally for blender 2.8 projects. For until then particles issues are considered a TODO.

Thanks for the report anyway!

Particles are really fragile, especially when you're trying to skip frames in their evaluaiton (which is exactly what speed effect does). We are planning to drop current implementation of particles and rething it all globally for blender 2.8 projects. For until then particles issues are considered a TODO. Thanks for the report anyway!

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Speeding up using VSE effects rotation of particles #48361