Visual Glitching in Speckle Viewer via ACC & Direct Upload

[Gab]

Context

The issue involves visual artifacts occurring when model elements overlap. Specifically, the test case consists of a timber wall containing timber columns modeled within the same volume. While these elements overlap in 3D space, the visual result varies depending on the ingestion method used.

The Problem

There is a inconsistency in how the Speckle Viewer renders overlapping geometry based on how the data was uploaded.

See screen record :
ScreenRec_260109_79740.mp4 - Google Disque

• Test Case 1: Revit Connector (Success)
  • Result: Works perfectly. No visual glitches or very minor. The viewer handles the overlapping geometry cleanly.
• Test Case 2: Autodesk Construction Cloud (ACC) Connector (Bug)
  • Result: Severe visual “flashing” or “flickering” (Z-fighting) where elements overlap. The model becomes nearly unusable due to the intensity of the glitch.
• Test Case 3: Direct Upload (Bug)
  • Result: Identical to the ACC Connector. The same visual glitch/flashing occurs for all overlapping elements.

Technical Observation

Since the Revit model version is identical in all three tests, the issue appears to be related to how the Speckle Revit Connector processes/flattens geometry versus how the ACC/Direct Upload services translate the same Revit file.

Is there a specific setting I should adjust to resolve this flickering?

[Gab]

After further analysis, the issue appears to come from Wall Sweeps in revit. This tool generates multiple geometries within the same element, which leads to 3D conflicts.
Since Wall Sweeps are mainly used to insert profiles into walls (bands, trims, etc.), the 3D volume usually adds little value.
A simple solution could be to exclude Wall Sweeps from solid rendering and rely on outlines only ?

[gokermu (Mucahit Bilal GOKER)]

Hey @Gab,

We’ve been working on the z-fighting issue and have made good progress—the primary z-fighting problem should now be resolved.

We’re still seeing some visual glitching with the sweeps in the walls. My understanding is that this is expected behavior, but I’d like to confirm with you whether this is within acceptable limits or if we need to investigate further.

[Gab]

Thanks! Perfect