GDTF Builder Release August 2026

Posted August 18, 2026  ‐ 3 min read  ‐ Categories: GDTF, GDTF Builder

This GDTF Builder update adds keyboard shortcuts, improved file management, additional RDM validation and several bug fixes.

GDTF Builder, the editor for creating and editing GDTF files, has received an update with new features and fixes.

New Features

DMX channels can now be moved up or down with the Alt+Up and Alt+Down keys, in addition to being moved via drag and drop.

Improved mesh file management

Mesh file management has been improved, particularly for uploading and renaming Default, High and Low Level of Detail (LOD) mesh files.

Low- and High-Level-of-Detail meshes can only be uploaded after the Default mesh exists
Low- and High-Level-of-Detail meshes can only be uploaded after the Default mesh exists
Mesh file management
Mesh file management
The model size can be reset to the dimensions of the 3D model.

WheelSlotIndex validation

When opening a file with a ChannelSet whose WheelSlotIndex does not exist in the Wheel, the Builder now reports an error. A ChannelSet can also be explicitly set to have no WheelSlot link.

No WheelSlot link
No WheelSlot link

Faster custom attribute creation

When creating a Custom Attribute, the PrettyName is now pre-filled from its name.

Creating a Custom Attribute
Creating a Custom Attribute
Pre-filled PrettyName
Pre-filled PrettyName

Automatic channel resolution addresses

When a DMX Channel is extended to a higher resolution, for example from 8-bit to 16-bit, the fine, ultra or uber address is automatically set to the base address plus one.

RDM and fixture data improvements

After the Fixture Name is changed, the RDM UID is deleted and a message is shown at the bottom of the window. This prevents RDM UID duplication when fixture files are copied.

The Builder also reports additional errors when RDM information is incomplete, such as when a Manufacturer ID is present but the Device Model ID is missing, or when a DMX Mode is missing its software version.

Device Model ID missing indication
Device Model ID missing indication

The Builder now allows CRI (TM30-18) definitions to be specified for a device.

CRI (TM30-18) definitions
CRI (TM30-18) definitions

Wheel slot color previews

Wheel slot previews now show a color when the slot color is defined through a filter link.

Wheel slot color
Wheel slot color

Bug fixes

The following issues have been fixed:

  • After deleting a DMX Mode, its SoftwareVersionID no longer remains in the XML.
  • Copy and paste now work correctly on DMX channels with a NoFeature or Dummy attribute.
  • Moving 3D geometries no longer causes a spike in browser memory usage.
  • ChannelSet values saved as percentages are now rounded correctly in the XML.
  • Long floating-point values are no longer trimmed when they are edited or displayed.
  • The top header bar is now correctly visible on smaller screens.
Top header bar
Top header bar
  • The initial revision text is now correct when creating a GDTF file based on another file. It shows the original device name instead of the new device name.
Initial revision text
Initial revision text
  • Duplicating a geometry with a Break now preserves the Break value.
  • The color value of a Custom Attribute is now preserved.
  • Opening a GDTF file with many Channels or Channel Functions is now much faster after improvements to the library and loading process.
  • Several SubPhysicalUnits now have the correct default PhysicalFrom and PhysicalTo values.
  • The Snap option in the Geometry preview did not work as expected and has been removed for now.
Previous: GDTF Builder Release January 2026