Update SLM Display SDK (4.2.1)
July 21, 2026

Update SLM Display SDK (4.2.1)

An updated version of the HOLOEYE SLM Display SDK is available now. Updates can be downloaded through https://customers.holoeye.com. This minor update mainly includes some bug fixes.

One of the main fixes relates to the CGH computation which used a non-deterministic initial random phase field.  Repeated computations of the same input image could produce different results which could effect some visible noise if the CGHs are displayed in a sequence.

Bug Fixes:

  • Fixed that the CGH computation used a non-deterministic initial random phase field, so that repeated computations of the same input image could produce different results. The initial random phase field is now fixed, so computing the same input image multiple times with the same settings produces exactly the same result, also across other HOLOEYE applications like SLM Slideshow Player and SLM Pattern Generator. In a future release, we may extend the API to optionally allow a different initial random phase field, and therefore different outputs. For now, the behavior is made consistent without any API changes.
  • Fixed that the maximum tile size setting from the API was sometimes ignored by the internal CGH computation.
  • Improved CGH computation performance.
  • Improved GPU detection to avoid crashes caused by faulty graphics drivers.
  • Updated the device images shown in the EDID Device Detection dialog for HOLOEYE TITAN and LETO-720 SLMs.
  • Reimplemented the HOLOEYE update check in a new, more secure way. This removes the dependency on the OpenSSL and Qt Network DLLs.
  • Removed the Intel TBB runtime DLLs from the installation, since the SDK binaries do not depend on them anymore.
  • Updated the installer for security reasons.
  • Minor fixes in the Python Library API bindings to make the Linux version of the library accessible.

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