# Smooth View-Dependent Rendering in Animations

**Axel Friedrich - Konrad Polthier - Markus Schmies**

### Abstract

View-dependent rendering allows interactive visualization of larger scenes. A
well-known artifact is the popping problem in animations resulting from temporal
differences in the level of detail between the view-dependent representations
used in subsequent frames.

We solve the popping problem by computing view-dependent representations of a
scene only at every $n$-th frame, and smoothly interpolate adjacent keyframe
sections to obtain the representations for all in-between frames. Additionally,
we accelerate rendering at only minor accuracy costs since interpolation is much
faster than computing a view-dependent for each displayed frame.

We use scenes represented as triangle hierarchies and fulfilling a special
constraint allowing for fast interpolation without remeshing. In contrast to
other approaches our method naturally extends to animated scenes whose geometry
and mesh may adaptively change in time.

**CR Categories: **I.3.5 [Computer Graphics]: Computational Geometry and
Object Modeling - Surface and object representations; I.3.5 [Computer Graphics]:
Computational Geometry and Object Modeling - Hierarchy and geometric
transformations; I.3.6 [Computer Graphics]: Methodology and Techniques -
Graphics data structures and data types I.3.7 [Computer Graphics]:
Three-dimensional graphics and realism - animation

**Keywords: **animation, shape interpolation, adaptive refinement,
level-of-detail, multiresolutional representation

**Full Preprint:** Smooth View-Dependent Rendering
in Animations (.pdf 337 KB)