Image Based Rendering -- Chap 1
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Introduction
One of the primary goals in computer graphics is photorealistic rendering. Much
progress has been made over the years in graphics in a bid to attain this goal, with
significant advancements in 3D representations and model acquisition, measurement
and modeling of object surface properties such as the bidirectional reflectance dis-
tribution function (BRDF) and surface subscattering, illumination modeling, nat-
ural objects such as plants, and natural phenomena such as water, fog, smoke,
snow, and fire. More sophisticated graphics hardware that permit very fast render-
ing, programmable vertex and pixel shading, larger caches and memory footprints,
and floating-point pixel formats also help in the cause. In other words, a variety of
well-established approaches and systems are available for rendering models. See the
surveys on physically-based rendering [232J, global illumination methods [691, and
photon mapping (an extension of ray tracing)
[130].
Despite all the advancements in the more classical areas of computer graphics,
it is still hard to compete with images of real scenes. The rendering quality of envi-
ronments in animated movies such as Shrek 2 and even games such as Ghost Recon
for Xbox 360^*^ is excellent, but there are hints that these environments are syn-
thetic. Websites such as http://www.ignorancia.org/ showcase highly photorealistic
images that were generated through raytracing, which is computationally expensive.
The special effects in high-budget movies blend seamlessly in real environments, but
they typically involved many man-hours to create and refine. The observation that
full photorealism is really hard to achieve with conventional 3D and model-based
graphics has led researchers to take a "short-cut" by working directly with real im-
ages.
This approach is called image-based modeling and rendering. Some of the
special effects used in the movie industry were created using image-based rendering
techniques described in this book.
Image-based modeling and rendering techniques have received a lot of attention
as a powerful alternative to traditional geometry-based techniques for image syn-
thesis.
These techniques use images rather than geometry as the main primitives
for rendering novel views. Previous surveys related to image-based rendering (IBR)
have suggested characterizing a technique based on how image-centric or geometry-
资源评论
cg_master2012-05-02东西不错，可以通过这本书了解一下基于图像空间的渲染。
imak472012-11-20真心不错的东西，谢谢分享了
