RiftLibrary
RiftLibrary is a Forge library for 1.12.2 that adds animation, rendering and networking tools for other mods to build on.
What it does
RiftLibrary is a fork of GeckoLib that keeps GeckoLib's existing features and adds several more. Its additions cover dynamic hitboxes, dynamic rider positions, animation blending, a GUI API, a packet API and custom particles made with Snowstorm. Support for custom projectile models and for holding the last animation frame is included, along with rendering improvements.
Prehistoric Rift requires RiftLibrary, so the library must be installed for that mod to run. A server running it needs every connecting player to have it too. Files are published for Forge only, and the latest build, 2.0.0, targets 1.12.2. The first release arrived on 2025-11-25, and the last update on 2026-10-04.
The code is open source under the MIT License and is available as public source code. Snapshot builds are not part of the release history listed here, so only the 1.12.2 Forge line applies.
Key features
Dynamic hitboxes
Entity hitboxes can change with the animation playing, so collision follows the model as it moves.
Dynamic rider positions
Passengers can be placed at positions that update with the animated mount.
Animation blending
Transitions between animations are blended, so movement changes look smoother instead of snapping.
GUI and packet APIs
Mods can build screens and send network packets through the library's own API layers.
Snowstorm particles
Custom particles built with Snowstorm can be used in animated models, and projectile models can be customized.
Compatibility
Latest build for each game version and loader.
Only full game releases are shown. This mod publishes no snapshot builds.
Required by 1 mod
Use cases
Animated mob models
Mod authors can animate entities with blended transitions and dynamic hitboxes instead of writing those systems themselves.
Mounts and vehicles
Riders can sit at positions that follow an animated body, which suits creatures and vehicles with moving parts.
Who it’s for: Mod developers building animated entities on Forge 1.12.2, and players who install Prehistoric Rift.
Questions
Does Prehistoric Rift need RiftLibrary?
Does RiftLibrary have to be installed on the server?
Which game version does RiftLibrary support?
More from ANightDazingZoroark
What the author says
Some more ideas down the line include: Custom particles made with snowstorm Support for hold on last frame * Improvements to the mod's rendering in general
Official listing
- Modrinth page
- modrinth.com/mod/riftlibrary
- Owner
- ANightDazingZoroark
- Published
- 2025-11-25
- Updated on Modrinth
- 2026-10-04
- Facts verified
- 2026-10-15