Usability – "follow path" with nonsensical path-parameters not caught, and I was utterly lost. #55933

New Issue

Mike Robinson · 2018-07-12T01:58:40+02:00

Mike Robinson commented

2018-07-12 01:58:40 +02:00

System Information
OS/X High Sierra, MacBook Pro current

Blender Version
2.79b

Short description of error
Usability – obvious-in-retrospect "follow path" mistake not caught

Exact steps for others to reproduce the error
Create an object and a path, then set a "follow path" constraint. Click on the path, and in "Object Data" specify the Evaluation Time but ("I plead n00b1e innocence!") fail to realize the importance of also specifying a non-zero value for Frames

Well, the resulting system behaviors are "genuinely 'WTF?!?!'" (Try it .. you'll see what I mean..)

When I clicked on "Animate Path," Blender sort-of correctly told me that "the path was already animated," but actually it wasn't – because it is nonsensical for either or both of these parameters to be zero. (Oops.) This would have been a stupendous time to alert me to this.

If there are no keyframes, and if the present set of parameters is nonsensical (frames=0), then I think that the software should stop and throw a meaningful exception.

**System Information** OS/X High Sierra, MacBook Pro current **Blender Version** 2.79b **Short description of error** Usability – obvious-in-retrospect "follow path" mistake not caught **Exact steps for others to reproduce the error** Create an object and a path, then set a "follow path" constraint. Click on the path, and in "Object Data" specify the *Evaluation Time* but ("I plead n00b1e innocence!") fail to realize the importance of also specifying a non-zero value for *Frames* Well, the resulting system behaviors are "genuinely 'WTF?!?!'" *(Try it .. you'll see what I mean..)* When I clicked on "Animate Path," Blender sort-of correctly told me that "the path was already animated," but actually it wasn't – because it is nonsensical for either or both of these parameters to be zero. *(Oops.)* This would have been a stupendous time to alert me to this. If there are no keyframes, and if the present set of parameters is nonsensical *(frames=0),* then I think that the software should **stop** and throw a meaningful exception.

Mike Robinson commented

2018-07-12 01:58:40 +02:00

Added subscriber: @sundialservices

Philipp Oeser commented

2018-07-12 13:10:32 +02:00

Added subscriber: @lichtwerk

Philipp Oeser commented

2018-07-12 13:10:32 +02:00

Not sure I can follow:

How are you actually setting a value of zero for Frames (curve.path_duration)? This should be clamped to 1?
This should be set to 100 Frames by default?
at a value of one for Frames (which should be the minimum), or above one, the system should behave as expected? Also see the manual

Marking as incomplete until we know how it actually happened that Frames can be zero...

Not sure I can follow: - How are you actually setting a value of zero for `Frames` (`curve.path_duration`)? This should be clamped to 1? - This should be set to 100 Frames by default? - at a value of one for `Frames` (which should be the minimum), or above one, the system should behave as expected? Also see [the manual ](https://docs.blender.org/manual/en/dev/rigging/constraints/relationship/follow_path.html) Marking as incomplete until we know how it actually happened that `Frames` can be zero...

Vuk Gardašević commented

2018-07-20 13:31:21 +02:00

Added subscriber: @VukGardasevic

Vuk Gardašević commented

2018-07-20 13:31:21 +02:00

Changed status from 'Open' to: 'Archived'

Vuk Gardašević closed this issue

2018-07-20 13:31:21 +02:00

Vuk Gardašević self-assigned this 2018-07-20 13:31:21 +02:00

Vuk Gardašević commented

2018-07-20 13:31:21 +02:00

More than a week passed without a reply.

Due to the tracker policy, archiving until the required additional information / data is provided.

More than a week passed without a reply. Due to the tracker policy, archiving until the required additional information / data is provided.

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Usability – "follow path" with nonsensical path-parameters not caught, and I was utterly lost. #55933