Object Info Random - inconsistent result #64095

New Issue

Serge Lyatin · 2019-05-02T23:39:55+02:00

Serge Lyatin commented

2019-05-02 23:39:55 +02:00

System Information
Operating system: Win10 64
Graphics card: gtx1050ti

Blender Version
Broken: 2.79, 2.8

Short description of error
Random output from Object Info depends on every object in scene, even Empties!
There are two identical scene sets with linked objects, but Empty belongs to Scene.001 only. Cube is instanced via duplifaces and Random produces different result if Empty isn't linked in both scenes.

Exact steps for others to reproduce the error
Open file, viewport render Scene and Scene.001
Obj_info_Random_out.blend

**System Information** Operating system: Win10 64 Graphics card: gtx1050ti **Blender Version** Broken: 2.79, 2.8 **Short description of error** *Random* output from **Object Info** depends on every object in scene, even *Empties*! There are two identical scene sets with linked objects, but *Empty* belongs to *Scene.001* only. *Cube* is instanced via duplifaces and *Random* produces different result if *Empty* isn't linked in both scenes. **Exact steps for others to reproduce the error** Open file, viewport render Scene and Scene.001 [Obj_info_Random_out.blend](https://archive.blender.org/developer/F7002090/Obj_info_Random_out.blend)

Serge Lyatin commented

2019-05-02 23:39:56 +02:00

Added subscriber: @SergeL

Philipp Oeser commented

2019-05-03 12:08:07 +02:00

Added subscribers: @Sergey, @brecht, @lichtwerk

Philipp Oeser commented

2019-05-03 12:08:07 +02:00

Can confirm the behaviour, but not sure this would be considered a bug.

Random is based on cycles internal object id. If scenes differ in regards to their objects, then these ids are just not garuanteed to be the same.

@brecht, @Sergey : mind sharing your thoughts?

Can confirm the behaviour, but not sure this would be considered a bug. Random is based on cycles internal object id. If scenes differ in regards to their objects, then these ids are just not garuanteed to be the same. @brecht, @Sergey : mind sharing your thoughts?

Serge Lyatin commented

2019-05-03 12:26:37 +02:00

I always thought that it takes into account only objects which share same material. If it's a known feature of render engine, then maybe it is worth a note in manual?

Philipp Oeser removed the

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Object Info Random - inconsistent result #64095