Knife tool creates duplicated vertices
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Description

System Information
Windows 8.1 pro Nvidia Geforce Gtx 970{F782457}

Blender 2.79
Broken: (example: 2.69.7 4b206af, see splash screen)
Worked: (optional)

i still have issue with knife tool,i attached my video what is happening to knife tool,when i cut from first edge to another,knife tool duplicates vertices along edges.
i cannot cut my polygonal object,because my knife tool creates duplicated vertices across all edges.

duplicated vertices are created when using knife on certain mesh
Based on a (as simple as possible) attached .blend file with minimum amount of steps

Details

Type
Bug

i have problem with knife tool,when i try to cut polygonal object from one edge to vertex or face of polygon.Knife tool creates duplicated vertices and it does not always create new edge.

Campbell Barton (campbellbarton) triaged this task as Incomplete priority.EditedSep 11 2017, 9:46 AM

The report has no steps to redo the error, this is needed to investigate.
The file with the problem is not enough.

Note that I tried making some cuts in the mesh and it worked without any problems.

Campbell Barton - what can i do in this case? - What did you do that blender was working without any issues,when you used knife tool.I used and it was creating duplicated vertexes.

I opened your file and used the knife to cut across faces on the mesh with/without snapping to corner vertices.
Please give an exact list of steps that fail - even if those steps seem obvious to you.

Szymon Warunek (szymi) raised the priority of this task from Incomplete to High.Sep 13 2017, 12:38 AM
Szymon Warunek (szymi) updated the task description. (Show Details)

please see my video,about this issue,i recorded my work by cam studio,to make it easy for you to see what happens when i cut along polygon edge.

It looks like it is relative to View Clipping.
Start value is at 0.001. If you increase it to 0.1 or switch to an orthographic view, knife is working correctly.

thank you very much! - this setting which is to do with viewport clipping solved my issue with knife tool.

please tell other people about this workaround and let other people know about it.

While this could be made to work better in the knife tool, documenting this as a known limitation:

rBM3766 - https://docs.blender.org/manual/en/dev/modeling/meshes/editing/subdividing/knife_subdivide.html#known-limitations