Blender Foundation: Blender 2.x BF release: Detail: 32254 Knife tool cut through option doesn't always work

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[#32254] Knife tool cut through option doesn't always work

Date:
2012-08-03 21:27 Priority:
3

State:
Closed

Submitted by:
Paul R (intracube) Assigned to:
Howard Trickey (howardt)

Category:
Mesh Modeling Status:
Fixed / Closed

Relates to: Duplicates:

Patches:

Summary:
Knife tool cut through option doesn't always work

Detailed description

Description:
'z' (cut through) option doesn't work if the user enables it after a cut line has been defined and if the user doesn't move the cursor again before confirming the line.

Steps:
1. add cube
2. edit mode
3. select all vertices
4. k, left mouseclick + drag to define cut line across the cube
5. z (enable cut through) - shows as enabled in UI
6. without moving cursor, leftclick again to confirm line
7. [enter] to make cut

Result:
z option is ignored - even though the viewport header displays "cut through (On)". *If the mouse is moved between steps 5 and 6, changes to the z option are updated*.

Repeatable:
Always

Blender versions (linux, x86_64):
2.63a (official) r46461
2.64 (testbuild1) r48802

Followup

Message

Date: 2012-09-18 16:32
Sender: Antony Riakiotakis
Hi, you should really press z -before- cutting.

Date: 2012-09-18 16:34
Sender: Antony Riakiotakis
Maybe Howardt can give an opinion too?

Date: 2012-09-18 17:14
Sender: Howard Trickey
This seems like a pretty minor bug, since it easily worked around by making sure to hit z before reaching the final position for the cut line. But it is probably pretty easy to recalculate the current state (and, therefore, different cuts) as soon as z is hit. Not sure we should try to do this in current bcon4 state though.

Date: 2012-09-20 18:47
Sender: Paul R
Once the 'correct' order is figured out it's a non-issue, but it's something that could confuse a new user.

"But it is probably pretty easy to recalculate the current state (and, therefore, different cuts) as soon as z is hit."
That sounds the best solution.

An alternative fix might be to only allow the knife options to be modified (and only display them in the header) before the line starts to be defined. A downside to this would be a user wouldn't be able to make multiple cuts and change the settings as they go for different lines.

Date: 2012-09-20 23:50
Sender: Serj Maiorov
It's not a bug and quite predictable:
The knife will cut everything if you'll start the line outside the mesh, and not at snapping it to an edge.
By beginning it with an edge-snap it will cut through the mesh precisely *after* the beginning edge.

Date: 2012-09-26 11:52
Sender: Paul R
Serj Maiorov;
What you're describing sounds unrelated to this bug. In my tests I did start the line outside the mesh (and also finished outside the mesh).

Date: 2012-10-22 20:53
Sender: Howard Trickey
Campbell fixed this in rev 51106 (Oct 6, 2012).

Attached Files:

No Files Currently Attached

Changes:

Field	Old Value	Date	By

status_id	Open	2012-10-22 20:53	howardt
close_date	None	2012-10-22 20:53	howardt
Status	New	2012-10-22 20:53	howardt
assigned_to	none	2012-09-18 16:34	psy-fi