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Dupliverts don't work when a modifier is added to duplicator object
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Description

System Information
Operating system: Ubuntu 18.04
Graphics card: Nvidia 1080 Ti

Blender Version
Broken: Blender 2.80 (6d89337257b6 from December 25)

Short description of error
The cycles viewport won't stop udpating itself when a dupliverts parent object has a mirror modifier (or some other modifiers) applied to it. By "won't stop updating," I mean that it continuously renders sample 1 out of n. In my experience, this also stops the dupliverts from rendering in F12 cycles render.

Exact steps for others to reproduce the error

  1. Create a plane
  2. Enter edit mode on the plain
  3. Select all vertices
  4. Drag all vertices down, away from the origin
  5. Add but do not apply a mirror modifier in the Z direction
  6. Create a cube (as a separate object, so enter object mode first)
  7. Make the cube a child object of the plane
  8. Enable dupliverts on the plane
  9. Enter cycles render mode
  10. Enter rendered mode in viewport

Workaround

  1. Apply the mirror modifier

Details

Type
Bug