FAQ - Troubleshooting

ProblemPossible ReasonsSolution
Processing time is long

Hardware / Parameters

See Performance Optimization

Large / Many imagesUse –pyr to reduce the resolution of the input images. Level 1 is already 4-8 times faster than the full level, while leading to clouds with quarter size and a precision in depth decreased by factor 2.
Only very few or no points were extracted



Not enough imagesEach point should be present in at least 3 overlapping images. More are better.
No textureTexture on the object is required to enable image matching. Overexposed, underexposed, blurry images or surfaces without texture will lead to low quality, or missing parts in the point cloud. Texture can be projected artificially, but must be stable between the images.
Minimum number of stereo models per point (fold) too highFor low overlapping datasets, the minimum number of stereo models per point (fold) must be small. Check the rejection rate after the triangulation, and decrease the threshold by “-fold <min fold>” if necessary.  similar images should be available – acquired with small angular shift, similar image scale, similar distance to the object
Small intersection angleIn order to remove very distant, noisy points, a minimum intersection angle between the observing cameras is used (default: 4°). For large focal lengths (large zoom, e.g. with tele-lenses), this threshold might remove desired data. Check the rejection rate after the triangulation, and decrease the threshold by “-minangle <angle>” if necessary.
Insufficiently precise orientation

Dense image matching relies on precise orientation data as input. If the orientation does not satisfy the required precision, matching results will degrade.

Resolution on the object is low (point density, depth resolution) or noisy surfaces

Not enough ImagesEach point should be present in at least 3 overlapping images. More are better.
Processing Level too lowUse “–pyr 0” to run the processing on full resolution (default).
Image Orientation Quality too lowThe quality of the image orientation directly impacts the quality of the surface reconstruction. Improve the bundle adjustment outcome with your orientation software (e.g. rejecting outlier points)
Shifts between the point cloudsImage Orientation quality too lowSee above.
Clutter / outlier points are visible

Minimum number of stereo models per point (fold) too lowRedundancy due to highly overlapping imagery can be used to remove outliers. By increasing the minimum number of stereo models (fold) for each point, outliers can be detected better, while improving the precision.
Low textured areasIf insufficient texture is available, image matching becomes unstable. Unsharp or untextured areas, such as sky or defocused background can be removed automatically using the “Differential of Gaussian” filter. It can be activated by “-dog <min. gradient> <min area>”. 0.5 is the default value for the gradient (0.5 grey values change), while 0.2 is the default area (20% of the image). Decrease the latter threshold, to detect & remove smaller areas. 
Large angle between images. (blow-up exceeded)For each image, a couple of similar images should be available – acquired with small angular shift, similar image scale, similar distance to the object.  
Graphics card (GPU) is not in use

ParametersActivate graphics card use in Preferences or in command line with -gpu
HardwareUse Nividia CUDA compatible card with Compute Capability 2.0 or higher and latest drivers
Driver issuesMake sure, that latest Nvidia drivers are installed and that the CUDA Driver Timeout settings have been adjusted
Failed to connect to the license server


No Internet connectionSURE needs to re-validate its activation status periodically. For the validation procedure a connection to the Internet is required. If no Internet connection is available, there will be a grace period of up to two weeks during which SURE can still be used. Afterwards, a re-validation of the software is required.
Invalid proxy settings

If your connection to the Internet goes through a proxy server, SURE will try to read and use the proxy settings which are set for the Internet Explorer. In order to set a custom proxy server, please use SURE's command line interface with one of the following options:

Connection blocked by firewall or anti-virus softwarePlease open a web browser and navigate to https://wyday.com/. Use the Internet Explorer if possible. If there are problems loading this website, this is the source of the problem. Please try to deactivate the firewall, anti-virus, or anti-malware software which is blocking the connection or add the SURE executables (SURE.exe as well as the SURE Module's executables, and potentially the TurboActivate.exe) to their whitelist (or exclude it from whatever filtering that/those program(s) are doing).
Missing SHA-2 CertificateSince the release SURE version 2.0, an SHA-2 certificate is required for the communication with the activation servers. Make sure that this certificate is available on your system and/or the proxy the internet connection goes through.
Found disabled network adapters

For the licensing mechanism, SURE creates a hardware fingerprint. Part of this fingerprint are the properties of network adapters. To enable activation the follwing steps can be undertaken:

  • Activate all network adapters
  • Perform the activation with administrator rights

If this is not successful and you have more network adapters that are activated but not connected to the internet, please deactivate the network adapters from the BIOS.

Activation fails on LinuxElevated rights requiredOn Linux the license activation requires superuser permissions. Try sudo SURE -activate <key>
Activation fails because a virtual machine is detected although none is usedHyper-V activatedIf Hyper-V is activated, Windows runs in a virtual machine. This option can be disabled in Control Panel > Programs > Turn Windows Features on or off.
Image Viewer / Camera Stations / Mesh Editor crashesWindows RDP sessionThe Windows remote desktop session (via RDP) does not support rendering of OpenGL content. Since these modules (Image Viewer, Camera Stations, Mesh Editor) use OpenGL content, running SURE via RDP session can cause timeouts and/or crashes of the software.