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Instanced Meshes incorrectly rendered in Cycles (Sample 1 renders over and over again)
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Description

System Information
Operating system: Windows 10 Home 64 bit
Graphics card: NVIDIA GeForce GTX 1080

Blender Version
Broken: 2.80 Beta c6cbcf83d015

Short description of error

  • a mesh object consisting of a single vertex (in my example named "Vertex") has an array modifier (3 instances) on it
  • it has another object (in my example a UV sphere named "Sphere") as its only child object
  • instancing (per vert) is activated on the "Vertex" object
  • as expected, the sphere is instanced three times
  • as soon as render mode "Rendered" is activated (in Cycles), rendering seems to be stuck in a loop, rendering sample 1 over and over again
  • also, only the first and last instance show up in the render, the "middle" instance(s) is/are missing
  • happens for CPU and GPU alike, but only in Cycles, not in Eevee
  • when the array modifier is applied, the error goes away

Exact steps for others to reproduce the error

  • please open the attached file and switch display method to "Rendered"

Details

Type
Bug