subdivide bug #47936

New Issue

Gabriel · 2016-03-25T19:39:46+01:00

Gabriel commented

2016-03-25 19:39:46 +01:00

System Information
amd, Windows 7 64bit, nvidia Geforce 7100 GS

Blender Version
Broken: 2.77, other users say also 2.76 and bellow...i did not test it myself
Worked: did not test in other versions

Short description of error
subdivide not working

Exact steps for others to reproduce the error

start blender
enter edit mode (for the cube)
pick a vertex of the cube und move it up a little
select one face, than subdivide
select another face and than subdivide: it will not work.

bug1.blend

**System Information** amd, Windows 7 64bit, nvidia Geforce 7100 GS **Blender Version** Broken: 2.77, other users say also 2.76 and bellow...i did not test it myself Worked: did not test in other versions **Short description of error** subdivide not working **Exact steps for others to reproduce the error** 1. start blender 2. enter edit mode (for the cube) 3. pick a vertex of the cube und move it up a little 4. select one face, than subdivide 5. select another face and than subdivide: it will not work. [bug1.blend](https://archive.blender.org/developer/F298290/bug1.blend)

Gabriel commented

2016-03-25 19:39:46 +01:00

Changed status to: 'Open'

Gabriel self-assigned this 2016-03-25 19:39:46 +01:00

Gabriel commented

2016-03-25 19:39:46 +01:00

Added subscriber: @taxishop

Ignatz commented

2016-03-25 19:57:47 +01:00

Added subscriber: @ignatz

Ignatz commented

2016-03-25 19:57:47 +01:00

Windows 7 Pro 64-bit
Nvidia GeForce GTX 760
8 gig ram

Broken: 2.75a, 2.76, 2.77

I tested using the steps described above and the subdivide is not working in all of the listed Blender releases.

I also tested using the attached file "bug1;blend". Again, no success in the various Blender releases.

Windows 7 Pro 64-bit Nvidia GeForce GTX 760 8 gig ram Broken: 2.75a, 2.76, 2.77 I tested using the steps described above and the subdivide is not working in all of the listed Blender releases. I also tested using the attached file "bug1;blend". Again, no success in the various Blender releases.

Gabriel commented

2016-03-25 20:07:13 +01:00

hello Ignatz, that could be, i use to test releases of blender that way, with simple steps, it could be that also other releases have the bug.

Gabriel commented

2016-03-25 21:09:48 +01:00

i see now, the bug is even easier to reproduce, without moving the vertex:

enter edit mode (for the cube)
select one face, than subdivide
select another face and than subdivide: it will not work.

i see now, the bug is even easier to reproduce, without moving the vertex: 1. enter edit mode (for the cube) 2. select one face, than subdivide 3. select another face and than subdivide: it will not work.

Alex commented

2016-03-25 22:01:10 +01:00

Added subscriber: @SpectreFirst

Alex commented

2016-03-25 22:01:10 +01:00

It looks like Subdivide tool cannot properly subdivide ngons. For example, if you'll try to subdivide ngon cap of a cylinder, you won't be able to do it, instead it will only subdivide edges of that ngon. I've tested this in 2.76 and 2.77 and it looks like this behavior is identical in both versions.

I'm not sure, but it's possible that such behavior have a reason: Subdivide tool have specific rules on how to subdivide triangles and quads, but maybe there are no rules on how to subdivide a random ngon (especially with multiple iterations) so it only subdivide surrounding edges. If this is the case, maybe it would be useful to make Subdivision tool act like a Poke Faces tool in case of ngons (or something like that). Subdivision Surface modifier can subdivide ngons in multiple iterations into quads so maybe it would also be possible to have an option between "Poke Face" behavior and "Subdivide into quads" behavior. These are just my speculations, but still.

It looks like Subdivide tool cannot properly subdivide ngons. For example, if you'll try to subdivide ngon cap of a cylinder, you won't be able to do it, instead it will only subdivide edges of that ngon. I've tested this in 2.76 and 2.77 and it looks like this behavior is identical in both versions. I'm not sure, but it's possible that such behavior have a reason: Subdivide tool have specific rules on how to subdivide triangles and quads, but maybe there are no rules on how to subdivide a random ngon (especially with multiple iterations) so it only subdivide surrounding edges. If this is the case, maybe it would be useful to make Subdivision tool act like a Poke Faces tool in case of ngons (or something like that). Subdivision Surface modifier can subdivide ngons in multiple iterations into quads so maybe it would also be possible to have an option between "Poke Face" behavior and "Subdivide into quads" behavior. These are just my speculations, but still.

Bastien Montagne commented

2016-03-26 13:06:29 +01:00

Added subscriber: @mont29

Bastien Montagne commented

2016-03-26 13:06:29 +01:00

Changed status from 'Open' to: 'Archived'

Bastien Montagne closed this issue

2016-03-26 13:06:29 +01:00

Bastien Montagne commented

2016-03-26 13:06:29 +01:00

The ngon face is 'subdivided' (see how more verts are added to its edges), if you want actual face 'multiplication' you'll first have to triangulate ngons first… No bug here.

Sign in to join this conversation.

No Label

Download

What's New

Blender Studio

Manual

Developers Blog

Documentation

Benchmark

Blender Conference

Development Fund

One-time Donations

subdivide bug #47936