Mirror Modifier not showing "Shadow" mesh in wireframe view #33217

New Issue

Pablo Vazquez · 2012-11-18T00:00:51+01:00

Pablo Vazquez commented

2012-11-18 00:00:51 +01:00

%%%Hi,

The Mirror modifier, when in wireframe view, shows the "shadow" mesh on the mirrored side, but only after you enter/exit object mode at least once.

Attached a .blend to follow the simple steps below, and an image showing the same 3 step process.

Open the attached .blend. It has a mesh object from which I deleted all the vertices, and it is in edit mode. Wireframe view.
Add something to it while in Edit mode, for example: Shift+A > Cube
The mirrored side doesn't show anything. Until you enter and exit Object mode, then it will show a "shadow" of the mirrored mesh.

Current SVN (r52310)
Ubuntu 12.10, NVIDIA 460 GTX (with propietary drivers up-to-date)

Cheers!%%%

%%%Hi, The Mirror modifier, when in wireframe view, shows the "shadow" mesh on the mirrored side, but only after you enter/exit object mode at least once. Attached a .blend to follow the simple steps below, and an image showing the same 3 step process. 1. Open the attached .blend. It has a mesh object from which I deleted all the vertices, and it is in edit mode. Wireframe view. 2. Add something to it while in Edit mode, for example: Shift+A > Cube 3. The mirrored side doesn't show anything. Until you enter and exit Object mode, then it will show a "shadow" of the mirrored mesh. Current SVN (r52310) Ubuntu 12.10, NVIDIA 460 GTX (with propietary drivers up-to-date) Cheers!%%%

Pablo Vazquez commented

2012-11-18 00:00:51 +01:00

Changed status to: 'Open'

Prashant Sohani commented

2012-11-19 16:35:50 +01:00

%%%I am trying to reproduce the bug, but the shadow does show up fine. Could you try again with another scene?%%%

Pablo Vazquez commented

2012-11-19 17:03:10 +01:00

%%%Just noticed it doesn't happen on 2.63. But it does happen on 2.64a, and current SVN.

Attached a video showing the error. The shadow mesh doesn't appear until going in/out edit mode.

Using latest SVN (as shown in splash)%%%

%%%Just noticed it doesn't happen on 2.63. But it does happen on 2.64a, and current SVN. Attached a video showing the error. The shadow mesh doesn't appear until going in/out edit mode. Using latest SVN (as shown in splash)%%%

Prashant Sohani commented

2012-11-19 17:35:49 +01:00

%%%Yes, now I see the problem. Even the array modifier gives the same problem. Seems to be an issue with the 3D view drawing/update, rather than the modifier itself.%%%

Prashant Sohani commented

2012-11-19 17:40:45 +01:00

%%%It seems that the only primitive for which the shadow does get displayed immediately in the wireframe mode, is the plane. All others (cube, cone, icosphere, individual vertices) have this issue.%%%

Sergey Sharybin commented

2012-11-20 10:01:06 +01:00

%%%Assigning to Antony, he's currently looking into familiar issue.

Antony, feel free to unassign it from you if its not causes by the same issue :)%%%

%%%Assigning to Antony, he's currently looking into familiar issue. Antony, feel free to unassign it from you if its not causes by the same issue :)%%%

Antonis Ryakiotakis commented

2012-11-20 11:34:06 +01:00

%%%The issue is that newly created edges are not set to draw. I see that only a few places in the code need to explicitly disable edge drawing while many places in the code need to have edge drawing on. Since enforcing this for every modifier will potentially spoil edge drawing of previous modifiers, I think starting with the flag on and disabling for subsequent modifiers is a better solution.
I committed a fix for the mirror modifier but I am not closing yet because I think that the other solution will better address the issue. Faulty case, currently subsurf with optimal drawing + mirror after subsurf will draw all edges, spoiling subsurf modifier's output. %%%

%%%The issue is that newly created edges are not set to draw. I see that only a few places in the code need to explicitly disable edge drawing while many places in the code need to have edge drawing on. Since enforcing this for every modifier will potentially spoil edge drawing of previous modifiers, I think starting with the flag on and disabling for subsequent modifiers is a better solution. I committed a fix for the mirror modifier but I am not closing yet because I think that the other solution will better address the issue. Faulty case, currently subsurf with optimal drawing + mirror after subsurf will draw all edges, spoiling subsurf modifier's output. %%%

Campbell Barton commented

2012-11-21 11:59:20 +01:00

%%%made edges default to using the draw flag r52436. closing.%%%

Campbell Barton commented

2012-11-21 11:59:21 +01:00

Changed status from 'Open' to: 'Resolved'

Campbell Barton closed this issue

2012-11-21 11:59:21 +01:00

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Mirror Modifier not showing "Shadow" mesh in wireframe view #33217