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Panorama Rotation Node gives output not equal input even with no changes

New Here ,
Jul 23, 2022 Jul 23, 2022

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I have Substance Designer 12.1.1 build 5825

 

When I use such scheme

input bitmap is in .exr format (32bit float or 16bit half-float) 

panorama Rotation (all parameters are at default values)

blend node with subtract option - there are differences, but the images must be the same!

 

1.png

Under differences I mean histogram Used Range values (see below)

2022-07-23 13-22-54.png

They are quite big (maybe with this current image), but this is math: if no changes - there must be no difference.

If I connect input bitmap to both blend node inputs that range is 0;0, and that is correct.

2022-07-23 13-30-59.png

The same error persists in any different resolution and with .hdr format images.

 

Only one thing I've found so far - when inserting exposure node just after the image and make exposure lowering - the error gets smaller too, but it is not 0 in any way.

 

Bug Unresolved
TOPICS
Bugs & Crashes , Substance Graph

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1 Comment
Adobe Employee ,
Jul 27, 2022 Jul 27, 2022

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Hello,

 

Thank you for the detailed report!

 

The differences are caused by the cumulated imprecisions in the way rotation is computed. A big part of these imprecisions are related to the limitations inherent to floating point arithmetic.

 

We are assessing this internally, I appreciate your patience in the meantime.

 

Best regards.

 

Luca Giarrizzo | QA Analyst, 3D & Immersive | Adobe

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