Antijump

Antijump is a term used in computer graphics, animation, and real-time systems to describe techniques that prevent perceptible jumps or discontinuities when state variables are updated. The goal is to maintain smooth visual or experiential transitions as values change over time, such as character poses, camera positions, or interface elements.

In practice, antijump techniques are applied to several domains. In animation, they help blend between poses or motions so that transitions appear fluid rather than abrupt. In camera control, antijump methods smooth path updates to avoid sudden shifts when following a target or responding to user input. In networked or data-visualization contexts, they mitigate jumping caused by noisy, delayed, or partially received data by stabilizing updates through interpolation or filtering.

Common methods include temporal smoothing using low-pass or exponential filters, easing functions that gradually accelerate or decelerate changes, and constrained interpolation or spline methods that ensure continuity across frames. In interactive environments, clamping or snapping policies may be used to limit how far a value can jump, combined with prediction and correction schemes such as Kalman filtering to balance responsiveness with stability. In game networking, antijump can involve extrapolation with smoothing and rollback techniques to prevent abrupt teleports when reconciling server-authoritative positions.

Implementation considerations include choosing a smoothing factor that balances latency and stability, handling edge cases to avoid overshoot, and ensuring constraints (such as physical boundaries) remain respected. While antijump improves perceived quality, it can introduce a degree of lag or blur, so designers must weigh responsiveness against visual stability.

See also: interpolation, smoothing filter, easing function, motion blending.