Particles Flip / Cross when Follow a Curve Guide #38621

Closed
opened 9 years ago by FilipMond · 8 comments

System Information
OSX 10.8.5, NVIDIA GeForce GTX 780M 4096 MB

Blender Version
Broken: 2.69.0 r60991

Short description of error
Particles - flips over a curve when they gets into a control point with the same axis as first control point of curve.

See .blend file
Problem visible with 3D type of curve only - 2D works OK. 3D curve works since some control point gets "Z" value (curve become real 3D). Seems like it depending on a first control point orientation (I'm not sure what is the rule).

Layer 1

  • First control point in X axis - Particles Fliping - Top/Bottom
    Layer 2
  • First control point in Y axis - Particles Crossing - Left/Right
    test-Particles-Flip-Cross.blend

(Another example…test-Particles-FieldCurve-3x.blend)

I found some reported bugs or todo with rotation problem, but no one was related to "Curve Guide".
If there is any sorry I didn't found it.

Is there a energy to fix it? Thank you

**System Information** OSX 10.8.5, NVIDIA GeForce GTX 780M 4096 MB **Blender Version** Broken: 2.69.0 r60991 **Short description of error** Particles - flips over a curve when they gets into a control point with the same axis as first control point of curve. **See .blend file** Problem visible with 3D type of curve only - 2D works OK. 3D curve works since some control point gets "Z" value (curve become real 3D). Seems like it depending on a first control point orientation (I'm not sure what is the rule). Layer 1 - First control point in X axis - Particles Fliping - Top/Bottom Layer 2 - First control point in Y axis - Particles Crossing - Left/Right [test-Particles-Flip-Cross.blend](https://archive.blender.org/developer/F77132/test-Particles-Flip-Cross.blend) (Another example…[test-Particles-FieldCurve-3x.blend](https://archive.blender.org/developer/F77134/test-Particles-FieldCurve-3x.blend)) I found some reported bugs or todo with rotation problem, but no one was related to "Curve Guide". If there is any sorry I didn't found it. Is there a energy to fix it? Thank you
Poster

Changed status to: 'Open'

Changed status to: 'Open'
Poster

Added subscriber: @FilipMond

Added subscriber: @FilipMond
Collaborator

Added subscriber: @LukasTonne

Added subscriber: @LukasTonne
Collaborator

Yet another case of particle rotation issues ...

It looks like this problem is caused by extra offset treatment in the particle do_guides function:
https://developer.blender.org/diffusion/B/browse/master/source/blender/blenkernel/intern/particle.c;e1d9308616b00ebe350056258f56fe2775a085ed$2173

This code is supposed to rotate the initial offset of particles or so, but ends up influencing the rotation as well (without that the rotation correctly follows the curve, but then the offset doesn't rotate with it).

Yet another case of particle rotation issues ... It looks like this problem is caused by extra offset treatment in the particle do_guides function: https://developer.blender.org/diffusion/B/browse/master/source/blender/blenkernel/intern/particle.c;e1d9308616b00ebe350056258f56fe2775a085ed$2173 This code is supposed to rotate the initial offset of particles or so, but ends up influencing the rotation as well (without that the rotation correctly follows the curve, but then the offset doesn't rotate with it).
Sergey commented 9 years ago
Owner

Changed status from 'Open' to: 'Duplicate'

Changed status from 'Open' to: 'Duplicate'
Sergey closed this issue 9 years ago
Sergey commented 9 years ago
Owner

✘ Merged into #32340.

✘ Merged into #32340.
Sergey commented 9 years ago
Owner

Added subscriber: @Sergey

Added subscriber: @Sergey
Sergey commented 9 years ago
Owner

This is an old TODO with particle rotation. Area needs love really and it's kinda orphaned atm..

Moving to our TODO list so it'll be handles as soon as some cool guy starts working in that area. Thanks for the report anyway! :)

This is an old TODO with particle rotation. Area needs love really and it's kinda orphaned atm.. Moving to our TODO list so it'll be handles as soon as some cool guy starts working in that area. Thanks for the report anyway! :)
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Reference: blender/blender#38621
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