Misidentification of Edge #67733

New Issue

Yash Pal Goyal · 2019-07-26T14:11:50+02:00

Yash Pal Goyal commented

2019-07-26 14:11:50 +02:00

System Information
Operating system: Windows-10-10.0.17134 64 Bits
Graphics card: Intel(R) UHD Graphics 630 Intel 4.5.0 - Build 23.20.16.5018

Blender Version
Broken: version: 2.80 (sub 74), branch: master, commit date: 2019-07-18 14:52, hash: 38d4483c6a
Worked: (optional)

Short description of error
[Please fill out a short description of the error here]
Edge behaviour shown without the presence of edge

Exact steps for others to reproduce the error
[Please describe the exact steps needed to reproduce the issue]

Start with new file > general.
In edit mode, subdivide the cube once or more in edit mode.
Select the middle vertex/ middle 4 faces.
Press 'G' , then 'X'.

Drag towards the faces (i.e. drag inwards) and take it way inwards.

Notice that two opposite corner faces around this selection are behaving like triangles.
Even when not taken much back, this is shown prominently in Weight paint mode, and when viewing from sides (see the attached file, faces marked '3' and '6'). NOT required.blend

**System Information** Operating system: Windows-10-10.0.17134 64 Bits Graphics card: Intel(R) UHD Graphics 630 Intel 4.5.0 - Build 23.20.16.5018 **Blender Version** Broken: version: 2.80 (sub 74), branch: master, commit date: 2019-07-18 14:52, hash: `38d4483c6a` Worked: (optional) **Short description of error** [Please fill out a short description of the error here] Edge behaviour shown without the presence of edge **Exact steps for others to reproduce the error** [Please describe the exact steps needed to reproduce the issue] - Start with new file > general. - In edit mode, subdivide the cube once or more in edit mode. - Select the middle vertex/ middle 4 faces. - Press 'G' , then 'X'. # Drag towards the faces (i.e. drag inwards) and take it way inwards. - > Notice that two opposite corner faces around this selection are behaving like triangles. Even when not taken much back, this is shown prominently in Weight paint mode, and when viewing from sides (see the attached file, faces marked '3' and '6'). [NOT required.blend](https://archive.blender.org/developer/F7629760/NOT_required.blend)

Yash Pal Goyal commented

2019-07-26 14:11:50 +02:00

Added subscriber: @anonym

Alex commented

2019-07-26 16:07:41 +02:00

Added subscriber: @SpectreFirst

Alex commented

2019-07-26 16:07:41 +02:00

Looks like a pretty standard triangulation issue to me; as far as I know, Blender don't have a tool for manual retriangulation of invisible edges like for example 3DS Max so my guess is that the only way to avoid this is not to make heavily distorted polygons or to manually divide them into triangles.

Germano Cavalcante commented

2019-07-26 17:05:43 +02:00

Added subscriber: @mano-wii

Germano Cavalcante commented

2019-07-26 17:05:43 +02:00

Changed status from 'Open' to: 'Archived'

Germano Cavalcante closed this issue

2019-07-26 17:05:43 +02:00

Germano Cavalcante self-assigned this 2019-07-26 17:05:43 +02:00

Germano Cavalcante commented

2019-07-26 17:05:43 +02:00

This works as intended.
There are those who disagree with you saying that the right is the one that you indicated as wrong.
There are also those who say that both are wrong.
The ideal in these cases is to divide the polygon manually making explicit which edge is preferred.

This works as intended. There are those who disagree with you saying that the right is the one that you indicated as wrong. There are also those who say that both are wrong. The ideal in these cases is to divide the polygon manually making explicit which edge is preferred.

Yash Pal Goyal commented

2019-07-26 20:45:53 +02:00

After trying to re-state my whole point as clearly as possible for almost 2 hours, i somehow found/stumbled upon what u r trying to say by going to sculpt mode in wireframe view, and the tris can be seen across every quad. Holly molly!!

So, ultimately, every "anomaly" I mentioned, exist in other corners too, just that they were difficult to stumble upon when doing normal stuff (as they align with the direction of the grab, anyways, this detail's not important now).

When i was reading about different basics before starting into 3D thing, i had read somewhere that everything in 3d is ultimately made up of tris/triads. But seeing many tutorials, especially about topology, which emphasize hard core on quads, I almost forget that ultimately, binary is the foundation (ohh, and now i am using a stupid metaphor ??). So mano-wii (won't waste ur time by mentioning), yes, that is indeed intended, but at a quite deeper level than I observed.

So, i'm sorry for missing the crucial detail before reporting.

After trying to re-state my whole point as clearly as possible for almost 2 hours, i somehow found/stumbled upon what u r trying to say by going to **sculpt mode in wireframe view, and the tris can be seen across every quad**. Holly molly!! So, ultimately, every "anomaly" I mentioned, exist in other corners too, just that they were difficult to stumble upon when doing normal stuff (as they align with the direction of the grab, anyways, this detail's not important now). When i was reading about different basics before starting into 3D thing, i had read somewhere that **everything in 3d is ultimately made up of tris/triads**. But seeing many tutorials, especially about topology, which emphasize hard core on quads, I almost forget that ultimately, binary is the foundation (ohh, and now i am using a stupid metaphor ??). So mano-wii (won't waste ur time by mentioning), yes, that is indeed intended, but at a quite deeper level than I observed. So, i'm sorry for missing the crucial detail before reporting.

Yash Pal Goyal commented

2019-07-26 20:47:43 +02:00

Removed subscriber: @anonym

Germano Cavalcante commented

2019-07-26 21:29:05 +02:00

Technically it is possible to make polygons fill depending only on the view (without this triangular tessellation).
But that's not how things work today in the world of 3D computer graphics.

Technically it is possible to make polygons fill depending only on the view (without this triangular tessellation). But that's not how things work today in the world of 3D computer graphics.

Yash Pal Goyal commented

2019-07-26 21:49:50 +02:00

This comment was removed by @anonym

*This comment was removed by @anonym*

Yash Pal Goyal commented

2019-07-26 22:55:44 +02:00

Edit: U already said it here:

In #67733#736114, @SpectreFirst wrote:
the way to avoid this is to manually divide them into triangles.

so, this comment is of no use now, and i am removing the file.

Here's the file explaining it (hopefully ?? !)
{F7630321}
Also, try switching between weight paint view and vertex paint view.~~~

Edit: U already said it here: > In #67733#736114, @SpectreFirst wrote: > the way to avoid this is to manually divide them into triangles. so, this comment is of no use now, and i am removing the file. ~~~@SpectreFirst I found a way on how to make it work. Just join the opposite vertices of the face (check the file:-). What this does, is it overrides the underlying invisible tris. Here's the file explaining it (hopefully ?? !) {F7630321} Also, try switching between weight paint view and vertex paint view.~~~

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Misidentification of Edge #67733

Drag towards the faces (i.e. drag inwards) and take it way inwards.