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Broken shading with mirror modifier and auto smooth normals while hiding verts.
Closed, ResolvedPublic

Description

System Information
Linux Mint 16 Petra x64, NVIDIA GeForce GTS 450

Blender Version
blender-2.70-863352d-linux-glibc211-x86_64

Short description of error
Shading of faces look as if they had inverted normals, while:

  1. you hide some faces or vertices in edit mode, but only
  2. if there is mirror modifier
  3. and and auto smooth normals on.

i'ts not a big problem. I'ts only in edit mode. It does not cause problems when rendering.
I can turn off auto smooth while modeling, but it is inconvenient.

Exact steps for others to reproduce the error

  1. subdivide cube
  2. delete half
  3. subdivide everything (to have more faces to observe shading issue)
  4. add mirror modifier
  5. shade cube smooth
  6. turn on auto smooth normals
  7. hide something in edit mode

Event Timeline

Tomasz Jurczyk (ikkiz) set Type to Bug.
Tomasz Jurczyk (ikkiz) created this task.
Tomasz Jurczyk (ikkiz) raised the priority of this task from to Needs Triage by Developer.

Confirmed on Win7/64.

blender-2.70-9de24c8-win64: works
blender-2.70-6e9c2d0-win64: crashes when opening the file
blender-2.70-b179647-win64: broken (artifacts)

Hmm… works OK with VBO, not with legacy mode, this is a bit unexpected… :/