Changeset 266 for trunk/VUT/doc/SciReport/online.tex

Timestamp:

09/13/05 18:44:54 (19 years ago)

Author:

bittner

Message:

structural changes

File:

• trunk/VUT/doc/SciReport/online.tex (modified) (5 diffs)

trunk/VUT/doc/SciReport/online.tex

@@ -44 +44 @@
 \begin{figure}%[htb]
   %\centerline
-        \centering \footnotesize
-        \begin{tabular}{c}
-        \includegraphics[width=0.6\textwidth, draft=\DRAFTFIGS]{images/ogre_terrain} \\
-        %\hline 
-        \includegraphics[width=0.3\textwidth, draft=\DRAFTFIGS]{images/vis_viewfrustum} \hfill \includegraphics[width=0.3\textwidth, draft=\DRAFTFIGS]{images/vis_chc} \\
-        \end{tabular}
+  \centering \footnotesize
+  \begin{tabular}{c}
+  \includegraphics[width=0.6\textwidth, draft=\DRAFTFIGS]{images/ogre_terrain} \\
+  %\hline 
+  \includegraphics[width=0.3\textwidth, draft=\DRAFTFIGS]{images/vis_viewfrustum} \hfill \includegraphics[width=0.3\textwidth, draft=\DRAFTFIGS]{images/vis_chc} \\
+  \end{tabular}
 %\label{tab:online_culling_example}
   \caption{(top) The rendered terrain scene. (bottom) Visualizion of the rendered / culled objects.
     Using view frustum culling (left image) vs. occlusion queries (right image).
     The yellow boxes show the actually rendered scene objects. The
-        red boxes depict the view frustum culled hierarchy nodes, the blue boxes depict the
-        occlusion query culled hierarchy nodes.}
+    red boxes depict the view frustum culled hierarchy nodes, the blue boxes depict the
+    occlusion query culled hierarchy nodes.}
   \label{fig:online_culling_example}
 \end{figure}
 
 Recent graphics hardware natively supports an \emph{occlusion query}
-to detect the visibility of an object against the current contents of the
-z-buffer.  Although the query itself is processed quickly using the
-raw power of the graphics processing unit (GPU), its result is not
+to detect the visibility of an object against the current contents of
+the z-buffer.  Although the query itself is processed quickly using
+the raw power of the graphics processing unit (GPU), its result is not
 available immediately due to the delay between issuing the query and
 its actual processing in the graphics pipeline. As a result, a naive
@@ -74 +74 @@
 simplicity and versatility: the method can be easily integrated in
 existing real-time rendering packages on architectures supporting the
-underlying occlusion query.
-In figure~\ref{fig:online_culling_example}, the same scene (top row) is rendered using view frustum
-culling (visualization in the bottom left image) versus online culling using occlusion queries (visualization 
-in the bottom right image). It can be seen that with view frustum culling only many objects are still rendered.
+underlying occlusion query.  In
+figure~\ref{fig:online_culling_example}, the same scene (top row) is
+rendered using view frustum culling (visualization in the bottom left
+image) versus online culling using occlusion queries (visualization
+in the bottom right image). It can be seen that with view frustum
+culling only many objects are still rendered.
 %Using spatial and assuming temporal coherence
 
@@ -105 +107 @@
 z-buffer allows to quickly determine if the geometry in question is
 occluded. To a certain extent this idea is used in the current
-generation of graphics hardware by applying early z-tests of
-fragments in the graphics pipeline (e.g., Hyper-Z technology of ATI or
-Z-cull of NVIDIA). However, the geometry still needs to be sent to the
-GPU, transformed, and coarsely rasterized even if it is later
-determined invisible.
+generation of graphics hardware by applying early z-tests of fragments
+in the graphics pipeline (e.g., Hyper-Z technology of ATI or Z-cull of
+NVIDIA). However, the geometry still needs to be sent to the GPU,
+transformed, and coarsely rasterized even if it is later determined
+invisible.
 
  Zhang~\cite{EVL-1997-163} proposed hierarchical occlusion maps, which
@@ -774 +776 @@
 %shown in the accompanying video.
 
-The complete power plant model is quite challenging even to load into memory,
-but on the other hand it offers good
-occlusion. This scene is an interesting candidate for testing not only
-due to its size, but also due to significant changes in visibility and depth complexity in
+The complete power plant model is quite challenging even to load into
+memory, but on the other hand it offers good occlusion. This scene is
+an interesting candidate for testing not only due to its size, but
+also due to significant changes in visibility and depth complexity in
 its different parts.
 
@@ -915 +917 @@
 \caption{Statistics for the three test scenes. VFC is rendering with only view-frustum culling, S\&W is the
   hierarchical stop and wait method, CHC is our new method, and Ideal
-is a perfect method with respect to the given hierarchy. All values are averages over
-all frames (including the speedup).}
+is a perfect method with respect to the given hierarchy. All values
+are averages over all frames (including the speedup).}
 \label{tab:averages}
 \end{table*}