In the following table you can see the results of rendering the attached test scene, with and without this PR.
The Test scene is derived from @lorentzo Google Summer of Code PR (#2886, Test Scene 34).
Generic
OSL
Pre
Post
In this scene, the problem does not occur, if you remove the UV map or if you use a UV map which has no effect. In those two cases, the result always looks the same.
I was not able to create a test scene without an UV map, having the same problem.
Fixes #1243.
In this scene, the problem does not occur, if you remove the UV map or if you use a UV map which has no effect. In those two cases, the result always looks the same. I was not able to create a test scene without an UV map, having the same problem.
The Test Scene: Example_Scene.zip