AR Foundation – Image Tracking Offset / Drift for Large-Scale Models

[sidAurainteract1901]

I am using AR Foundation with Runtime Image Tracking to place a 3D model aligned with a real-world object.

• When I scan the image target, the model is placed correctly and initial alignment looks accurate.
• However, when I move around and test from different angles, I start facing alignment issues.

Issue

• Small drifting/jitter even when tracking state is TrackingState.Tracking
• Around 4–6 inches offset between real object and 3D model
• From some angles alignment looks correct, but from other angles it does not match

What I Tried

• Using high-quality image targets with good feature points
• Tracking state is always TrackingState.Tracking
• Added AR Anchor to stabilize the model

Environment

• Unity Version: 6.0 (6000.0.58f2)
• AR Foundation Version: 6.0.6
• Current Observation

The tracked image position seems stable, but the 3D model alignment is not consistent, especially because the model is large in scale. Small tracking differences become very noticeable.

Question

• Is this expected behavior due to AR Foundation / ARCore / ARKit limitations?
• Is there any recommended way to improve alignment accuracy for large-scale models?