1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
|
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<!-- Created by texi2html 1.64 -->
<!--
Written by: Lionel Cons <Lionel.Cons@cern.ch> (original author)
Karl Berry <karl@freefriends.org>
Olaf Bachmann <obachman@mathematik.uni-kl.de>
and many others.
Maintained by: Olaf Bachmann <obachman@mathematik.uni-kl.de>
Send bugs and suggestions to <texi2html@mathematik.uni-kl.de>
-->
<HTML>
<HEAD>
<TITLE>Crystal Space: Texture Mapping Animations</TITLE>
<META NAME="description" CONTENT="Crystal Space: Texture Mapping Animations">
<META NAME="keywords" CONTENT="Crystal Space: Texture Mapping Animations">
<META NAME="resource-type" CONTENT="document">
<META NAME="distribution" CONTENT="global">
<META NAME="Generator" CONTENT="texi2html 1.64">
</HEAD>
<BODY LANG="" BGCOLOR="#FFFFFF" TEXT="#000000" LINK="#0000FF" VLINK="#800080" ALINK="#FF0000">
<A NAME="SEC386"></A>
<TABLE CELLPADDING=1 CELLSPACING=1 BORDER=0>
<TR><TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="cs_179.html#SEC385"> < </A>]</TD>
<TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="cs_181.html#SEC390"> > </A>]</TD>
<TD VALIGN="MIDDLE" ALIGN="LEFT"> <TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="cs_173.html#SEC376"> << </A>]</TD>
<TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="cs_174.html#SEC377"> Up </A>]</TD>
<TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="cs_181.html#SEC390"> >> </A>]</TD>
<TD VALIGN="MIDDLE" ALIGN="LEFT"> <TD VALIGN="MIDDLE" ALIGN="LEFT"> <TD VALIGN="MIDDLE" ALIGN="LEFT"> <TD VALIGN="MIDDLE" ALIGN="LEFT"> <TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="index.html#SEC_Top">Top</A>]</TD>
<TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="cs_toc.html#SEC_Contents">Contents</A>]</TD>
<TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="cs_285.html#SEC711">Index</A>]</TD>
<TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="cs_abt.html#SEC_About"> ? </A>]</TD>
</TR></TABLE>
<HR SIZE=1>
<H4> 7.6.6.6 Procedural, Dynamic and Animated Textures </H4>
<!--docid::SEC386::-->
<P>
OK so we have the texture mapped onto the polygon, now the fun stuff starts.
There are several ways to introduce movement into textures. Here is the terminology
used in crystal space to describe these methods and brief explanations of what they
entail:
</P><P>
<A NAME="SEC387"></A>
<H4> Animated Textures </H4>
<!--docid::SEC387::-->
Lets say we have several precomputed texture images, which when taken in
sequence form an animation. An Animated texture is simply when you swap
the texture image mapped on to the polygon between the precomputed texture images.
This is the simplest, cheapest and most common method.
<P>
<A NAME="SEC388"></A>
<H4> Dynamic Textures </H4>
<!--docid::SEC388::-->
<P>
Dynamic textures are when you manipulate the texture mapping transformation, or
the texture co-ordinates directly. This way you can rotate/scroll for example the
texture on the polygon while it remains static.
</P><P>
<A NAME="SEC389"></A>
<H4> Procedural Textures </H4>
<!--docid::SEC389::-->
<P>
If you still can't produce the effect you want with animated and or dynamic
textures then you can resort to procedural textures. Be warned this method is quite
expensive compared to the previous two, and should be used sparingly and only when
absolutely necessary. Another less common name for procedural textures is
programmatic textures. This is when you write the texture on the fly. The texture
is typically a buffer you render to in the same way as you would render to the
main screen. Good procedural texture implementations gives you full blown 3d
capable facilities to render to the texture. Fortunately Crystal Space has this :)
Typical uses for procedural textures is when the content of the texture responds
uniquely to user input or behaviour. A good example is having a computer terminal
within the virtual world which the user can type on and can see what they type
come up on the virtual screen.
<A NAME="Visibility Culling"></A>
<HR SIZE=1>
<TABLE CELLPADDING=1 CELLSPACING=1 BORDER=0>
<TR><TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="cs_179.html#SEC385"> < </A>]</TD>
<TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="cs_181.html#SEC390"> > </A>]</TD>
<TD VALIGN="MIDDLE" ALIGN="LEFT"> <TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="cs_173.html#SEC376"> << </A>]</TD>
<TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="cs_174.html#SEC377"> Up </A>]</TD>
<TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="cs_181.html#SEC390"> >> </A>]</TD>
<TD VALIGN="MIDDLE" ALIGN="LEFT"> <TD VALIGN="MIDDLE" ALIGN="LEFT"> <TD VALIGN="MIDDLE" ALIGN="LEFT"> <TD VALIGN="MIDDLE" ALIGN="LEFT"> <TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="index.html#SEC_Top">Top</A>]</TD>
<TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="cs_toc.html#SEC_Contents">Contents</A>]</TD>
<TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="cs_285.html#SEC711">Index</A>]</TD>
<TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="cs_abt.html#SEC_About"> ? </A>]</TD>
</TR></TABLE>
<BR>
<FONT SIZE="-1">
This document was generated
using <A HREF="http://www.mathematik.uni-kl.de/~obachman/Texi2html
"><I>texi2html</I></A>
</BODY>
</HTML>
|
