Viewport Shading vs Scene World differences, why?

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Trying to replicate the behavior of the HDRI environments used internally to illuminate and create the reflections in our 3D viewport, to obtain the same result in the final render, I found something that caught my attention:

To use the same environment in the render and have it look exactly the same it is necessary to rotate it -90º in Z, scale it up to 100,000 in XYZ (this I could understand… to create a giant sphere that surrounds us) but also negate the scale value in X, to -100,000.

Does anyone have any idea why it is necessary to make these modifications? I would expect to be able to leave all the default values in the mapping, really.

Or is there something fundamental I’m missing?

THANKS!

01_Internal_HDRI
01_Internal_HDRI2458×2214 393 KB

02_External_HDRI_BAD
02_External_HDRI_BAD2458×2214 413 KB

03_External_HDRI_OK
03_External_HDRI_OK2458×2214 430 KB

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Ohh, wow, thank you so much for your response! :grinning:

Now I understand where my mistake was: dragging the “forest.exr” image to the Node Graph from Desktop automatically generated an “Image Texture” node that only has Flat, Box, SPHERE & Tube Projections. But the correct thing is to use an “Environment Texture” node, with EQUIRECTANGULAR projection.

And also, thanks to your answer now I also discover that there is an addon that automatically generates a Scene World from the Internal World.

BIG THANKS!

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Yeah i was confused for quire some time about the whole subject myself