AnimEngine

AnimEngine is a lightweight C++ runtime focused on real-time animation systems.

See AnimEngineDemo for runnable examples.

Features

Implemented

• Easing Functions (StepStart, StepEnd, Linear, EaseIn, EaseOut, EaseInOut)
• Value types & interpolation: Vec3, Color, Quat, with a generic lerp<T> (quaternions interpolate via slerp)
• Keyframe Curve<T> (sorted keyframes, per-segment easing, range clamping)
• Tween<T> (value from→to over a duration, with easing)
• Spring<T> (physics-based, interruptible / re-targetable with velocity continuity; scalars & vectors)

All of Tween / Curve / Spring are templated over the value type — they drive float, Vec3, Color, and (Tween/Curve) Quat, with float as the CTAD default plus aliases like TweenFloat / SpringVec3.

Planned

• Scene Graph
• Transform Hierarchy
• Timeline
• Animation Clip
• Blend Tree
• Animation Layers
• State Machine
• Constraints
• Skeletal Animation

API Proposal

Simplified animation API for common use cases:

// Current: manually add keyframes
curve.addKeyframe(0.0f, 0.0f, Easing::EaseIn);
curve.addKeyframe(2.0f, 100.0f, Easing::EaseIn);

// Proposed: convenience method
curve.animate(0.0f, 100.0f, Easing::EaseIn, 2.0f);  // from, to, easing, duration

Building

Requirements

• CMake 3.16 or higher
• C++17 compiler

Standalone Build

mkdir build
cd build
cmake ..
cmake --build .

Running Tests

cmake .. -DANIMENGINE_BUILD_TESTS=ON
cmake --build .
ctest

Integration

Add to your CMake project via add_subdirectory:

add_subdirectory(external/AnimEngine)
target_link_libraries(your_target PRIVATE AnimEngine::animengine)