Missing Reflections in Snapshots with Screen Space Reflections Enabled

[canny]

When taking a snapshot with Screen Space Reflections (SSR) enabled in the viewer, reflections visible on reflective surfaces in the viewer window are not captured in the resulting snapshot. This results in a discrepancy between what the user sees in the viewer and the final saved image.

Steps to Reproduce:

Enable Screen Space Reflections in the viewer settings (Graphics -> Advanced Lighting Model -> Reflections -> Screen Space Reflections).

Position your avatar in a location with reflective surfaces (e.g., near water, mirrors, or shiny objects).

Ensure that reflections are clearly visible in the viewer window on those surfaces.

Take a snapshot using the in-viewer snapshot functionality.

Observe that the saved snapshot does not include the reflections that were visible in the viewer.

Expected Result:

The saved snapshot should accurately capture all visual elements present in the viewer window, including screen space reflections.

Actual Result:

The saved snapshot is missing the screen space reflections, resulting in a visually inconsistent image.

Workaround:

None known.

Affected Versions: [Specify affected viewer versions]

Attachments:

Snapshot_001.png - Result of the snapshot showing the missing reflections.

Viewer_Screen_Snip_Capture.JPG - Screenshot of the scene as seen from the viewer in-world, with reflections clearly visible.

https://secondlife.canny.io/admin/board/bug-reports/p/missing-reflections-in-snapshots-with-screen-space-reflections-enabled

[canny]

This issue has been linked to a Canny post: Missing Reflections in Snapshots with Screen Space Reflections Enabled 🎉

[AtlasLinden]

Note that this appears to occur when the Interface checkbox is unchecked in the Snapshot floater.

[AtlasLinden]

Similar issue that no longer appears to repro: https://github.com/secondlife/viewer-private/issues/185

[Hecklezz]

Investigating this issue a bit, I found that the first time gViewerWindow->rawSnapshot gets called, SSR is not being applied to the image it outputs, and this first call is what creates the mPreviewImage that is used to save to disk. Any subsequent call, such as the thumbnail picture or if you manually call it again even immediately after providing mPreviewImage as the output once again, SSR appears in the saved image (obviously this isn't ideal calling the same function twice twice in a row, so a more root-cause needs to be found).

So something going on inside gViewerWindow->rawSnapshot fixes the SSR not appearing, but only on subsequent calls to the function do you see the SSR in the output image.

There is a follow up issue as well, in that if you set the resolution beyond the window size, even with a subsequent call to gViewerWindow->rawSnapshot, SSR is always missing.