# TileGenerator: Skipping empty cluster

**URL:** https://community.pix4d.com/t/tilegenerator-skipping-empty-cluster/34694
**Category:** PIX4D International
**Created:** [September 11, 2026, 3:08pm UTC](https://community.pix4d.com/t/tilegenerator-skipping-empty-cluster/34694 "2026-09-11T15:08:53Z")
**Posts on this page:** 1
**Page:** 1

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### Author: ![naziha.rmiqi](https://avatars.discourse-cdn.com/v4/letter/n/e5b9ba/32.png) [@naziha.rmiqi](https://community.pix4d.com/u/naziha.rmiqi)
#### Post date: [September 11, 2026, 3:08pm UTC](https://community.pix4d.com/t/tilegenerator-skipping-empty-cluster/34694/1 "2026-09-11T15:08:54Z")

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Hello,

I am working in PIX4Dmapper with images captured from a camera mounted at the rear of a vehicle and pointing downward toward the road.

My dataset does not contain EXIF metadata. For each image, I only have:

- X, Y, Z coordinates
- Roll
- Pitch
- Heading

I manually defined the camera model using the internal calibration parameters of my camera/lens system.

Camera information:

- Camera: Matrix Vision mvBlueCOUGAR-X-1012bC
- Lens: Computar LM8JC10MV0828-MPY2
- Focal length: 8.5 mm
- Image size: 4096 x 3008
- Sensor size: 14.1312 mm x 10.3776 mm

Internal calibration used:

- Ck: -8.31463
- XH: 0.02678
- YH: -0.00295
- A1: -1.45518E-003
- A2: 1.77331E-005
- A3: 0
- B1: 0
- B2: 0
- C1: 0
- C2: 0

In the Quality Report:

- 22 out of 24 images are calibrated
- 2 images are disabled
- Matching is yellow with a median of 911.422 matches per calibrated image
- Overlap appears low in some areas
- Absolute camera position and orientation uncertainties: “Uncertainty computation failed”

The processing fails during dense processing with these errors:

- [Warning]: TileGenerator: Skipping empty cluster
- [Error]: Dense matching failed
- [Error]: Dense Processing failed
- [Error]: Generating tiles failed

My questions are:

1. How can I verify that my imported roll pitch heiding, orientations are correct in PIX4Dmapper?
2. Does this failure mainly indicate insufficient longitudinal overlap between images?
3. For a vehicle-mounted downward-looking road camera, are there recommended settings for dense matching or calibration?
4. Is there a recommended workflow for projects without EXIF but with external position and orientation data?