PMREMGenerator.fromScene does not render Scene Background correctly

Description of the problem

Hi there,

Currently when using an image background (in this case generated with PMREMGenerator) it seems that producing a PMREM using PREMGenerator’s fromScene will result in a mirroring of the scene’s background in the resulting Envmap.

It’s easier to show than explain, so here’s an example: https://jsfiddle.net/BruOps/e9obh3np/9/

Click the “Update PMREM” button so see what I mean. You’ll see the sky flip on the models.

Three.js version

• Dev
• r115
• Since r112?? That’s what I suspect at least.

Browser

• All of them
• Chrome
• Firefox
• Internet Explorer

OS

• All of them
• Windows
• macOS
• Linux
• Android
• iOS

Hardware Requirements (graphics card, VR Device, …)

N/A

[sciecode]

Just to confirm: https://jsfiddle.net/rvbwna14/ 😄

[sciecode]

I think this has to do with the fact that scene.scale.z *= - 1 doesn’t affect the way the background is rendered, so the expected behavior fails. The objects in the scene are rendered correctly, but not the scene background.