Automatic Speed Graph Generation for Predefined Camera Paths
Predefined camera paths are a valuable tool for the exploration of complex virtual environments. The speed at which the virtual camera travels along different path segments is key for allowing users to perceive and understand the scene while maintaining their attention. Current tools for speed adjustment of camera motion along predefinedpaths, such as keyframing, interpolation types and speed curve editors provide the animators with a great deal of exibility but other little support for the animator to decide which speed is better for each point along the path. In this paper we address the problem of computing a suitable speed curve for a predefined camera path through an arbitrary scene. We strive at adapting speed along the path to provide non-fatiguing, informative, interestingness and concise animations. Key elements of our approach include a new metric based on optical flow for quantifying the amount of change between two consecutive frames, the use of perceptual metrics to disregard optical flow in areas with low image saliency, and the incorporation of habituation metrics to keep the user attention. We also present the results of a preliminary user-study comparing user response with alternative approaches for computing speed curves.
MoviesThese movies show the different speed graphs computed for our tests models (oil tanker and office building). (XviD codec required)
Source codeGLSL fragment shader used for combine the different maps (saliency, motion and habituation). (Download)
Ferran Argelaguet, Carlos Andujar, 2009.