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source: GTP-Internal/trunk/Webpage/NOF/gtp_webpage/gtp_webpage_html/html/body_visibility.html @ 1393

Revision 1393, 6.0 KB checked in by giegl, 18 years ago (diff)
GTP webpage - Jungle Rumble page ready (apart from download links)

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2	<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
3	<HTML>
4	<HEAD>
5	<TITLE>Visibility</TITLE>
6	<META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=ISO-8859-1">
7	<META NAME="Generator" CONTENT="NetObjects Fusion 8 für Windows">
8	<BASE TARGET="_parent">
9	<LINK REL=STYLESHEET TYPE="text/css" HREF="../html/style.css">
10	<LINK REL=STYLESHEET TYPE="text/css" HREF="../html/site.css">
11	<STYLE>
12	</STYLE>
13	</HEAD>
14	<BODY NOF="(MB=(DefaultMasterBorder, 121, 61, 171, 0), L=(VisibilityLayout, 860, 700))" TOPMARGIN=0 LEFTMARGIN=0 MARGINWIDTH=0 MARGINHEIGHT=0>
15	<TABLE BORDER=0 CELLSPACING=0 CELLPADDING=0 WIDTH=860 NOF=LY>
16	<TR VALIGN=TOP ALIGN=LEFT>
17	<TD WIDTH=19 HEIGHT=54><IMG SRC="../assets/images/autogen/clearpixel.gif" WIDTH=19 HEIGHT=1 BORDER=0 ALT=""></TD>
18	<TD WIDTH=7><IMG SRC="../assets/images/autogen/clearpixel.gif" WIDTH=7 HEIGHT=1 BORDER=0 ALT=""></TD>
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21	</TR>
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23	<TD COLSPAN=2></TD>
24	<TD COLSPAN=2 WIDTH=834 CLASS="TextObject" STYLE="background-color: rgb(255,255,255);">
25	<P>In computer graphics, <B>Visibility</B> deals with the problem of rendering faster by rendering only the objects of the scene that can be seen.<BR>Existing solutions along that line employed in modern day 3D/game-engines are mostly based either on <B>Portals</B> or on <B>Quake style PVS</B> (potentially visible set). While these approaches have been successfully employed in commercial products for years, they nonetheless have considerable drawbacks: </P>
26	<OL>
27	<LI>Both approaches are <I>not suited for outdoor scenes</I> (except scenes which are technically indoor-scenes).</LI>
28	<LI>It is <I>hard to automatically place portals efficiently</I>, so it normally has to be done by hand.</LI>
29	<LI><I>Portals</I> are by nature a very <I>conservative visibility approximation</I>.</LI>
30	<LI><I>Portals</I> are <I>not suited for dynamic occluders</I>.</LI>
31	<LI>For maximum efficiency <I>Quake style PVS </I>is usually done on a scene<I> stored in a BSP tree</I>, which, amongst other drawbacks, is a scene data structure <I>not well suited for dynamically changing scenes</I>.</LI>
32	<LI><I>Quake style PVS</I> precalculation can take prohibitively long.</LI>
33	</OL>
34	<P STYLE="margin-top: 6pt;">The <B>GTP VisibilityLib</B> will overcome these problems with a 2-phase strategy: </P>
35	<OL>
36	<LI>A solution which supplies <B>precalculated visibility</B> based on <B>modern visibility research</B>, also suited for <B>outdoor scenes</B>.</LI>
37	<LI>A solution which efficiently employs <B>modern day graphic hardware</B> to deliver <B>on-the-fly visibility</B> with <B>minimal overhead</B>.</LI>
38	</OL>
39	<P> Both solutions work best when used together, but can also be employed independently from one another, as to best suit the 3D/game engine in use.</P>
40	<P> </P>
41	<P>
42	<TABLE WIDTH=834 BORDER=0 CELLSPACING=0 CELLPADDING=0 ALIGN=LEFT NOF=TE>
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45	<TABLE ID="Tabelle1" BORDER=0 CELLSPACING=2 CELLPADDING=2 WIDTH="100%">
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48	<P><IMG ID="Bild2" HEIGHT=200 WIDTH=266 SRC="../assets/images/autogen/a_city_highestres_noseam.gif" VSPACE=0 HSPACE=0 ALIGN="TOP" BORDER=1 STYLE="border-left-color: rgb(0,102,204); border-left-style: solid; border-top-color: rgb(0,102,204); border-top-style: solid; border-right-color: rgb(0,102,204); border-right-style: solid; border-bottom-color: rgb(0,102,204); border-bottom-style: solid;" ALT="city_highestres_noseam" TITLE="city_highestres_noseam"></P>
49	</TD>
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51	<P><IMG ID="Bild3" HEIGHT=200 WIDTH=266 SRC="../assets/images/autogen/a_overview_highestres.gif" VSPACE=0 HSPACE=0 ALIGN="TOP" BORDER=1 STYLE="border-left-color: rgb(0,102,204); border-left-style: solid; border-top-color: rgb(0,102,204); border-top-style: solid; border-right-color: rgb(0,102,204); border-right-style: solid; border-bottom-color: rgb(0,102,204); border-bottom-style: solid;" ALT="overview_highestres" TITLE="overview_highestres"></P>
52	</TD>
53	<TD>
54	<P><IMG ID="Bild4" HEIGHT=200 WIDTH=276 SRC="../assets/images/autogen/a_city_vis_highestres_aa.gif" VSPACE=0 HSPACE=0 ALIGN="TOP" BORDER=1 STYLE="border-left-color: rgb(0,102,204); border-left-style: solid; border-top-color: rgb(0,102,204); border-top-style: solid; border-right-color: rgb(0,102,204); border-right-style: solid; border-bottom-color: rgb(0,102,204); border-bottom-style: solid;" ALT="city_vis_highestres_aa" TITLE="city_vis_highestres_aa"></P>
55	</TD>
56	</TR>
57	</TABLE>
58	</TD>
59	</TR>
60	</TABLE>
61	</P>
62	<P> </P>
63	</TD>
64	</TR>
65	<TR VALIGN=TOP ALIGN=LEFT>
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67	</TR>
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70	<TD COLSPAN=2 WIDTH=25 CLASS="TextObject">
71	<P><BR> </P>
72	<P> </P>
73	</TD>
74	<TD></TD>
75	</TR>
76	</TABLE>
77	</BODY>
78	</HTML>
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