Efficient View-Dependent Image-Based Rendering with
This paper presents how the image-based rendering technique of
view-dependent texture-mapping (VDTM) can be efficiently implemented
using projective texture mapping, a feature commonly available in
polygon graphics hardware. VDTM is a technique for generating novel
views of a scene with approximately known geometry making maximal use
of a sparse set of original views. The original presentation of VDTM
by Debevec, Taylor, and Malik required significant per-pixel
computation and did not scale well with the number of original images.
In our technique, we precompute for each polygon the set of original
images in which it is visible and create a ``view map'' data structure
that encodes the best texture map to use for a regularly sampled set
of possible viewing directions. To generate a novel view, the view
map for each polygon is queried to determine a set of no more than
three original images to blend together to render the polygon.
Invisible triangles are shaded using an object-space hole-filling
method. We show how the rendering process can be streamlined for
implementation on standard polygon graphics hardware, and present
results of using the method to render a large-scale model of the
Berkeley bell tower and its surrounding campus environment.