After a lot of testing between Twinmotion 2025.1 and 2025.1.1, I have confirmed multiple export-related problems that appeared only in 2025.1.1.
Here’s a detailed breakdown:
1. Video Material Speedup during Export
In Twinmotion 2025.1.1, video textures (MP4s) used as video materials are sped up during final video exports.
Viewport playback is fine, but when rendering (especially at 60 FPS), the video texture plays too fast.
Strangely, creating a fresh new project in 2025.1.1 and reimporting the same video material exports correctly — suggesting it’s a file/project-specific bug, not a universal engine issue.
Conclusion:
➔ Older or upgraded project files (from previous versions) seem to carry hidden broken timing settings.
➔ Clean projects behave normally in 2025.1.1.
2. Fire/Particle Animation Speedup during Export
Particle systems (such as fire) also appear sped up during final video export.
Just like video materials, viewport playback is normal, but export speeds them up.
No adjustment options for particle timing are exposed in Twinmotion’s UI currently.
May be related to the same hidden project timebase problems.
3. Missing Sound in Final Video Exports
In Twinmotion 2025.1.1, sounds from Twinmotion’s built-in Sound Library (ambience, effects, etc.) do not export with final rendered videos.
Viewport preview plays sounds normally, but rendered videos are completely silent.
This worked fine in 2025.1.
4. Various Crashes (Especially After Exporting)
Frequent crashes have been observed, particularly immediately after finishing video exports.
Sometimes the export finishes successfully, but Twinmotion crashes to desktop right after.
Happens more often with larger projects or complex sequences.
Not observed during simple test scenes or very short exports.
This instability was not present in 2025.1 to the same degree.
Feature Wishlist (for Future Twinmotion Updates)
Based on the problems described above, and general workflow experience, here are some feature improvements that would seriously improve Twinmotion’s reliability and flexibility:
1. Video Material Playback Rate Adjustment
Allow manual control of video playback speed (0.5x, 1x, 2x, etc.) inside Twinmotion for video textures.
Would help fix cases where Twinmotion misinterprets frame rates or internal timings.
2. Particle Animation Timing Control
Provide a simple option to slow down or speed up particle systems (fire, smoke, etc.).
Right now particles always play at a fixed “real time” speed with no user control during animations or exports.
3. Export Sound Debug Options
Add an option to force-enable/disable audio export in the video export panel.
Optional “audio preview” checkbox to verify if sound will render correctly before starting the export.
4. Better Project Version Compatibility / Auto-Fix
When opening older projects, automatically scan for known issues (like broken timing settings) and offer to “Clean Project” or “Reset Timelines.”
Would prevent project corruption during upgrades.
5. Stability Improvements After Export
Focus on fixing crashes that happen immediately after successful video exports.
Improve memory handling and cleanup during large sequence renders.
6. Export Log or Error Report
After each export, generate a simple log file listing warnings or problems (missing sounds, dropped frames, export errors).
Would help users and developers troubleshoot much faster.
7. Video Material with Alpha or Mask Support
Add true support for video materials with alpha transparency (or at least black/white mask channels).
Allow users to use animated effects like fire, smoke, water splashes, etc., properly composited into the scene without needing workaround hacks.
8. More Realistic Fire/Particle Systems with Full Controls
Add more detailed settings to particle effects like fire and smoke:
Scale (independent in XYZ)
Shape (custom emitter shape)
Burn speed or lifetime
Opacity/fade control
Color gradient over time (e.g., orange to black for fire)
Current fire effects are too simple and unrealistic for high-end cinematic work.
Basic timeline animation support for particle systems would also be extremely useful.