Startsida Utforska Hjälp
Logga in
CYBERDEViL
/
irrlicht-code
Bevaka 1
Stjärnmärk 0
Fork 0
Filer Ärenden 0 Pull-förfrågningar 1
Gren: master
Grenar Taggar
irrlicht-code
/
examples
/
23.SMeshHandling
/
tutorial.html

tutorial.html 30 KB
Permalänk Historik Rå

123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187188189190191192193194195196197198199200201202203204205206207208209210 
  1. <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
    2. 

  2. <html>
    3. 

  3. <head>
    4. 

  4. <meta http-equiv="Content-Type" content="text/xhtml;charset=UTF-8"/>
    5. 

  5. <meta http-equiv="X-UA-Compatible" content="IE=9"/>
    6. 

  6. <meta name="generator" content="Doxygen 1.8.13"/>
    7. 

  7. <meta name="viewport" content="width=device-width, initial-scale=1"/>
    8. 

  8. <title>Tutorial 23: SMeshBufferHandling</title>
    9. 

  9. <html xmlns="http://www.w3.org/1999/xhtml">
    10. 

  10. <!-- Wanted to avoid copying .css to each folder, so copied default .css from doxyen in here, kicked out most stuff we don't need for examples and modified some a little bit. 
    11. 

  11.      Target was having a single html in each example folder which is created from the main.cpp files and needs no files besides some images below media folder.
    12. 

  12.      Feel free to improve :)
    13. 

  13. 	 -->
    14. 

  14. <style>
    15. 

  15. body, table, div, p, dl {
    16. 

  16. 	font: 400 14px/22px;
    17. 

  17. }
    18. 

  18. body {
    19. 

  19. 	background-color: #F0F0F0;
    20. 

  20. 	color: black;
    21. 

  21. 	margin-left: 5%;
    22. 

  22. 	margin-right: 5%;
    23. 

  23. }
    24. 

  24. p.reference, p.definition {
    25. 

  25. 	font: 400 14px/22px;
    26. 

  26. }
    27. 

  27. .title {
    28. 

  28. 	font: 400 14px/28px;
    29. 

  29. 	font-size: 150%;
    30. 

  30. 	font-weight: bold;
    31. 

  31. 	margin: 10px 2px;
    32. 

  32. }
    33. 

  33. h1, h2, h3, h4, h5, h6 {
    34. 

  34. 	-webkit-transition: text-shadow 0.5s linear;
    35. 

  35. 	-moz-transition: text-shadow 0.5s linear;
    36. 

  36. 	-ms-transition: text-shadow 0.5s linear;
    37. 

  37. 	-o-transition: text-shadow 0.5s linear;
    38. 

  38. 	transition: text-shadow 0.5s linear;
    39. 

  39. 	margin-right: 15px;
    40. 

  40. }
    41. 

  41. caption {
    42. 

  42. 	font-weight: bold;
    43. 

  43. }
    44. 

  44. h3.version {
    45. 

  45. 	font-size: 90%;
    46. 

  46. 	text-align: center;
    47. 

  47. }
    48. 

  48. a {
    49. 

  49. 	color: #3D578C;
    50. 

  50. 	font-weight: normal;
    51. 

  51. 	text-decoration: none;
    52. 

  52. }
    53. 

  53. .contents a:visited {
    54. 

  54. 	color: #4665A2;
    55. 

  55. }
    56. 

  56. a:hover {
    57. 

  57. 	text-decoration: underline;
    58. 

  58. }
    59. 

  59. a.el {
    60. 

  60. 	font-weight: bold;
    61. 

  61. }
    62. 

  62. a.code, a.code:visited, a.line, a.line:visited {
    63. 

  63. 	color: #4665A2; 
    64. 

  64. }
    65. 

  65. a.codeRef, a.codeRef:visited, a.lineRef, a.lineRef:visited {
    66. 

  66. 	color: #4665A2; 
    67. 

  67. }
    68. 

  68. pre.fragment {
    69. 

  69. 	border: 1px solid #C4CFE5;
    70. 

  70. 	background-color: #FBFCFD;
    71. 

  71. 	padding: 4px 6px;
    72. 

  72. 	margin: 4px 8px 4px 2px;
    73. 

  73. 	overflow: auto;
    74. 

  74. 	word-wrap: break-word;
    75. 

  75. 	font-size:  9pt;
    76. 

  76. 	line-height: 125%;
    77. 

  77. 	font-family: monospace, fixed;
    78. 

  78. 	font-size: 105%;
    79. 

  79. }
    80. 

  80. div.fragment {
    81. 

  81. 	padding: 0px;
    82. 

  82. 	margin: 4px 8px 4px 2px;
    83. 

  83. 	background-color: #FBFCFD;
    84. 

  84. 	border: 1px solid #C4CFE5;
    85. 

  85. }
    86. 

  86. div.line {
    87. 

  87. 	font-family: monospace, fixed;
    88. 

  88. 	font-size: 13px;
    89. 

  89. 	min-height: 13px;
    90. 

  90. 	line-height: 1.0;
    91. 

  91. 	text-wrap: unrestricted;
    92. 

  92. 	white-space: -moz-pre-wrap; /* Moz */
    93. 

  93. 	white-space: -pre-wrap;     /* Opera 4-6 */
    94. 

  94. 	white-space: -o-pre-wrap;   /* Opera 7 */
    95. 

  95. 	white-space: pre-wrap;      /* CSS3  */
    96. 

  96. 	word-wrap: break-word;      /* IE 5.5+ */
    97. 

  97. 	text-indent: -53px;
    98. 

  98. 	padding-left: 53px;
    99. 

  99. 	padding-bottom: 0px;
    100. 

  100. 	margin: 0px;
    101. 

  101. 	-webkit-transition-property: background-color, box-shadow;
    102. 

  102. 	-webkit-transition-duration: 0.5s;
    103. 

  103. 	-moz-transition-property: background-color, box-shadow;
    104. 

  104. 	-moz-transition-duration: 0.5s;
    105. 

  105. 	-ms-transition-property: background-color, box-shadow;
    106. 

  106. 	-ms-transition-duration: 0.5s;
    107. 

  107. 	-o-transition-property: background-color, box-shadow;
    108. 

  108. 	-o-transition-duration: 0.5s;
    109. 

  109. 	transition-property: background-color, box-shadow;
    110. 

  110. 	transition-duration: 0.5s;
    111. 

  111. }
    112. 

  112. div.contents {
    113. 

  113. 	margin-top: 10px;
    114. 

  114. 	margin-left: 12px;
    115. 

  115. 	margin-right: 8px;
    116. 

  116. }
    117. 

  117. div.center {
    118. 

  118. 	text-align: center;
    119. 

  119. 	margin-top: 0px;
    120. 

  120. 	margin-bottom: 0px;
    121. 

  121. 	padding: 0px;
    122. 

  122. }
    123. 

  123. div.center img {
    124. 

  124. 	border: 0px;
    125. 

  125. }
    126. 

  126. span.keyword {
    127. 

  127. 	color: #008000
    128. 

  128. }
    129. 

  129. span.keywordtype {
    130. 

  130. 	color: #604020
    131. 

  131. }
    132. 

  132. span.keywordflow {
    133. 

  133. 	color: #e08000
    134. 

  134. }
    135. 

  135. span.comment {
    136. 

  136. 	color: #800000
    137. 

  137. }
    138. 

  138. span.preprocessor {
    139. 

  139. 	color: #806020
    140. 

  140. }
    141. 

  141. span.stringliteral {
    142. 

  142. 	color: #002080
    143. 

  143. }
    144. 

  144. span.charliteral {
    145. 

  145. 	color: #008080
    146. 

  146. }
    147. 

  147. blockquote {
    148. 

  148. 	background-color: #F7F8FB;
    149. 

  149. 	border-left: 2px solid #9CAFD4;
    150. 

  150. 	margin: 0 24px 0 4px;
    151. 

  151. 	padding: 0 12px 0 16px;
    152. 

  152. }
    153. 

  153. hr {
    154. 

  154. 	height: 0px;
    155. 

  155. 	border: none;
    156. 

  156. 	border-top: 1px solid #4A6AAA;
    157. 

  157. }
    158. 

  158. address {
    159. 

  159. 	font-style: normal;
    160. 

  160. 	color: #2A3D61;
    161. 

  161. }
    162. 

  162. div.header {
    163. 

  163. 	background-image:url('nav_h.png');
    164. 

  164. 	background-repeat:repeat-x;
    165. 

  165. 	background-color: #F9FAFC;
    166. 

  166. 	margin:  0px;
    167. 

  167. 	border-bottom: 1px solid #C4CFE5;
    168. 

  168. }
    169. 

  169. div.headertitle {
    170. 

  170. 	padding: 5px 5px 5px 10px;
    171. 

  171. }
    172. 

  172. .image {
    173. 

  173. 	text-align: center;
    174. 

  174. }
    175. 

  175. .caption {
    176. 

  176. 	font-weight: bold;
    177. 

  177. }
    178. 

  178. div.zoom {
    179. 

  179. 	border: 1px solid #90A5CE;
    180. 

  180. }
    181. 

  181. tr.heading h2 {
    182. 

  182. 	margin-top: 12px;
    183. 

  183. 	margin-bottom: 4px;
    184. 

  184. }
    185. 

  185. </style>
    186. 

  186. </head>
    187. 

  187. <div id="top"><!-- do not remove this div, it is closed by doxygen! -->
    188. 

  188. <!--END TITLEAREA-->
    189. 

  189. <!-- end header part -->
    190. 

  190. <!-- Generated by Doxygen 1.8.13 -->
    191. 

  191. </div><!-- top -->
    192. 

  192. <div class="header">
    193. 

  193.   <div class="headertitle">
    194. 

  194. <div class="title">Tutorial 23: SMeshBufferHandling </div>  </div>
    195. 

  195. </div><!--header-->
    196. 

  196. <div class="contents">
    197. 

  197. <div class="textblock"><div class="image">
    198. 

  198. <img src="../../media/example_screenshots/023shot.jpg" alt="023shot.jpg"/>
    199. 

  199. </div>
    200. 

  200.  <p>A tutorial by geoff.</p>
    201. 

  201. <p>In this tutorial we'll learn how to create custom meshes and deal with them with Irrlicht. We'll create an interesting heightmap with some lighting effects. With keys 1,2,3 you can choose a different mesh layout, which is put into the mesh buffers as desired. All positions, normals, etc. are updated accordingly.</p>
    202. 

  202. <p>Ok, let's start with the headers (I think there's nothing to say about it) </p><div class="fragment"><div class="line"><span class="preprocessor">#include &lt;irrlicht.h&gt;</span></div><div class="line"><span class="preprocessor">#include &quot;driverChoice.h&quot;</span></div><div class="line"></div><div class="line"><span class="preprocessor">#ifdef _MSC_VER</span></div><div class="line"><span class="preprocessor">#pragma comment(lib, &quot;Irrlicht.lib&quot;)</span></div><div class="line"><span class="preprocessor">#endif</span></div><div class="line"></div><div class="line"><span class="comment">//Namespaces for the engine</span></div><div class="line"><span class="keyword">using namespace </span>irr;</div><div class="line"><span class="keyword">using namespace </span>video;</div><div class="line"><span class="keyword">using namespace </span>core;</div><div class="line"><span class="keyword">using namespace </span>scene;</div><div class="line"><span class="keyword">using namespace </span>io;</div><div class="line"><span class="keyword">using namespace </span>gui;</div></div><!-- fragment --><p> This is the type of the functions which work out the colour.</p><div class="fragment"><div class="line"><span class="keyword">typedef</span> SColor colour_func(f32 x, f32 y, f32 z);</div></div><!-- fragment --><p> Here comes a set of functions which can be used for coloring the nodes while creating the mesh.</p><div class="fragment"><div class="line"><span class="comment">// Greyscale, based on the height.</span></div><div class="line">SColor grey(f32, f32, f32 z)</div><div class="line">{</div><div class="line">    u32 n = (u32)(255.f * z);</div><div class="line">    <span class="keywordflow">return</span> SColor(255, n, n, n);</div><div class="line">}</div><div class="line"></div><div class="line"><span class="comment">// Interpolation between blue and white, with red added in one</span></div><div class="line"><span class="comment">// direction and green in the other.</span></div><div class="line">SColor yellow(f32 x, f32 y, f32)</div><div class="line">{</div><div class="line">    <span class="keywordflow">return</span> SColor(255, 128 + (u32)(127.f * x), 128 + (u32)(127.f * y), 255);</div><div class="line">}</div><div class="line"></div><div class="line"><span class="comment">// Pure white.</span></div><div class="line">SColor white(f32, f32, f32) { <span class="keywordflow">return</span> SColor(255, 255, 255, 255); }</div></div><!-- fragment --><p> The type of the functions which generate the heightmap. x and y range between -0.5 and 0.5, and s is the scale of the heightmap.</p><div class="fragment"><div class="line"><span class="keyword">typedef</span> f32 generate_func(s16 x, s16 y, f32 s);</div><div class="line"></div><div class="line"><span class="comment">// An interesting sample function :-)</span></div><div class="line">f32 eggbox(s16 x, s16 y, f32 s)</div><div class="line">{</div><div class="line">    <span class="keyword">const</span> f32 r = 4.f*sqrtf((f32)(x*x + y*y))/s;</div><div class="line">    <span class="keyword">const</span> f32 z = (f32)exp(-r * 2) * (cosf(0.2f * x) + cosf(0.2f * y));</div><div class="line">    <span class="keywordflow">return</span> 0.25f+0.25f*z;</div><div class="line">}</div><div class="line"></div><div class="line"><span class="comment">// A rather dumb sine function :-/</span></div><div class="line">f32 moresine(s16 x, s16 y, f32 s)</div><div class="line">{</div><div class="line">    <span class="keyword">const</span> f32 xx=0.3f*(f32)x/s;</div><div class="line">    <span class="keyword">const</span> f32 yy=12*y/s;</div><div class="line">    <span class="keyword">const</span> f32 z = sinf(xx*xx+yy)*sinf(xx+yy*yy);</div><div class="line">    <span class="keywordflow">return</span> 0.25f + 0.25f * z;</div><div class="line">}</div><div class="line"></div><div class="line"><span class="comment">// A simple function</span></div><div class="line">f32 justexp(s16 x, s16 y, f32 s)</div><div class="line">{</div><div class="line">    <span class="keyword">const</span> f32 xx=6*x/s;</div><div class="line">    <span class="keyword">const</span> f32 yy=6*y/s;</div><div class="line">    <span class="keyword">const</span> f32 z = (xx*xx+yy*yy);</div><div class="line">    <span class="keywordflow">return</span> 0.3f*z*cosf(xx*yy);</div><div class="line">}</div></div><!-- fragment --><p> A simple class for representing heightmaps. Most of this should be obvious.</p><div class="fragment"><div class="line"><span class="keyword">class </span>HeightMap</div><div class="line">{</div><div class="line"><span class="keyword">private</span>:</div><div class="line">    <span class="keyword">const</span> u16 Width;</div><div class="line">    <span class="keyword">const</span> u16 Height;</div><div class="line">    f32 s;</div><div class="line">    core::array&lt;f32&gt; data;</div><div class="line"><span class="keyword">public</span>:</div><div class="line">    HeightMap(u16 _w, u16 _h) : Width(_w), Height(_h), s(0.f), data(0)</div><div class="line">    {</div><div class="line">        s = sqrtf((f32)(Width * Width + Height * Height));</div><div class="line">        data.set_used(Width * Height);</div><div class="line">    }</div><div class="line"></div><div class="line">    <span class="comment">// Fill the heightmap with values generated from f.</span></div><div class="line">    <span class="keywordtype">void</span> generate(generate_func f)</div><div class="line">    {</div><div class="line">        u32 i=0;</div><div class="line">        <span class="keywordflow">for</span>(u16 y = 0; y &lt; Height; ++y)</div><div class="line">            <span class="keywordflow">for</span>(u16 x = 0; x &lt; Width; ++x)</div><div class="line">                <span class="keyword">set</span>(i++, calc(f, x, y));</div><div class="line">    }</div><div class="line"></div><div class="line">    u16 height()<span class="keyword"> const </span>{ <span class="keywordflow">return</span> Height; }</div><div class="line">    u16 width()<span class="keyword"> const </span>{ <span class="keywordflow">return</span> Width; }</div><div class="line"></div><div class="line">    f32 calc(generate_func f, u16 x, u16 y)<span class="keyword"> const</span></div><div class="line"><span class="keyword">    </span>{</div><div class="line">        <span class="keyword">const</span> f32 xx = (f32)x - Width*0.5f;</div><div class="line">        <span class="keyword">const</span> f32 yy = (f32)y - Height*0.5f;</div><div class="line">        <span class="keywordflow">return</span> f((u16)xx, (u16)yy, s);</div><div class="line">    }</div><div class="line"></div><div class="line">    <span class="comment">// The height at (x, y) is at position y * Width + x.</span></div><div class="line"></div><div class="line">    <span class="keywordtype">void</span> <span class="keyword">set</span>(u16 x, u16 y, f32 z) { data[y * Width + x] = z; }</div><div class="line">    <span class="keywordtype">void</span> <span class="keyword">set</span>(u32 i, f32 z) { data[i] = z; }</div><div class="line">    f32 <span class="keyword">get</span>(u16 x, u16 y) <span class="keyword">const</span> { <span class="keywordflow">return</span> data[y * Width + x]; }</div></div><!-- fragment --><p> The only difficult part. This considers the normal at (x, y) to be the cross product of the vectors between the adjacent points in the horizontal and vertical directions.</p>
    203. 

  203. <p>s is a scaling factor, which is necessary if the height units are different from the coordinate units; for example, if your map has heights in meters and the coordinates are in units of a kilometer.</p><div class="fragment"><div class="line">    vector3df getnormal(u16 x, u16 y, f32 s)<span class="keyword"> const</span></div><div class="line"><span class="keyword">    </span>{</div><div class="line">        <span class="keyword">const</span> f32 zc = <span class="keyword">get</span>(x, y);</div><div class="line">        f32 zl, zr, zu, zd;</div><div class="line"></div><div class="line">        <span class="keywordflow">if</span> (x == 0)</div><div class="line">        {</div><div class="line">            zr = <span class="keyword">get</span>(x + 1, y);</div><div class="line">            zl = zc + zc - zr;</div><div class="line">        }</div><div class="line">        <span class="keywordflow">else</span> <span class="keywordflow">if</span> (x == Width - 1)</div><div class="line">        {</div><div class="line">            zl = <span class="keyword">get</span>(x - 1, y);</div><div class="line">            zr = zc + zc - zl;</div><div class="line">        }</div><div class="line">        <span class="keywordflow">else</span></div><div class="line">        {</div><div class="line">            zr = <span class="keyword">get</span>(x + 1, y);</div><div class="line">            zl = <span class="keyword">get</span>(x - 1, y);</div><div class="line">        }</div><div class="line"></div><div class="line">        <span class="keywordflow">if</span> (y == 0)</div><div class="line">        {</div><div class="line">            zd = <span class="keyword">get</span>(x, y + 1);</div><div class="line">            zu = zc + zc - zd;</div><div class="line">        }</div><div class="line">        <span class="keywordflow">else</span> <span class="keywordflow">if</span> (y == Height - 1)</div><div class="line">        {</div><div class="line">            zu = <span class="keyword">get</span>(x, y - 1);</div><div class="line">            zd = zc + zc - zu;</div><div class="line">        }</div><div class="line">        <span class="keywordflow">else</span></div><div class="line">        {</div><div class="line">            zd = <span class="keyword">get</span>(x, y + 1);</div><div class="line">            zu = <span class="keyword">get</span>(x, y - 1);</div><div class="line">        }</div><div class="line"></div><div class="line">        <span class="keywordflow">return</span> vector3df(s * 2 * (zl - zr), 4, s * 2 * (zd - zu)).normalize();</div><div class="line">    }</div><div class="line">};</div></div><!-- fragment --><p> A class which generates a mesh from a heightmap.</p><div class="fragment"><div class="line"><span class="keyword">class </span>TMesh</div><div class="line">{</div><div class="line"><span class="keyword">private</span>:</div><div class="line">    u16 Width;</div><div class="line">    u16 Height;</div><div class="line">    f32 Scale;</div><div class="line"><span class="keyword">public</span>:</div><div class="line">    SMesh* Mesh;</div><div class="line"></div><div class="line">    TMesh() : Width(0), Height(0), Scale(1.f), Mesh(0)</div><div class="line">    {</div><div class="line">        Mesh = <span class="keyword">new</span> SMesh();</div><div class="line">    }</div><div class="line"></div><div class="line">    ~TMesh()</div><div class="line">    {</div><div class="line">        Mesh-&gt;drop();</div><div class="line">    }</div><div class="line"></div><div class="line">    <span class="comment">// Unless the heightmap is small, it won&#39;t all fit into a single</span></div><div class="line">    <span class="comment">// SMeshBuffer. This function chops it into pieces and generates a</span></div><div class="line">    <span class="comment">// buffer from each one.</span></div><div class="line"></div><div class="line">    <span class="keywordtype">void</span> init(<span class="keyword">const</span> HeightMap &amp;hm, f32 scale, colour_func cf, IVideoDriver *driver)</div><div class="line">    {</div><div class="line">        Scale = scale;</div><div class="line"></div><div class="line">        <span class="keyword">const</span> u32 mp = driver -&gt; getMaximalPrimitiveCount();</div><div class="line">        Width = hm.width();</div><div class="line">        Height = hm.height();</div><div class="line"></div><div class="line">        <span class="keyword">const</span> u32 sw = mp / (6 * Height); <span class="comment">// the width of each piece</span></div><div class="line"></div><div class="line">        u32 i=0;</div><div class="line">        <span class="keywordflow">for</span>(u32 y0 = 0; y0 &lt; Height; y0 += sw)</div><div class="line">        {</div><div class="line">            u16 y1 = y0 + sw;</div><div class="line">            <span class="keywordflow">if</span> (y1 &gt;= Height)</div><div class="line">                y1 = Height - 1; <span class="comment">// the last one might be narrower</span></div><div class="line">            addstrip(hm, cf, y0, y1, i);</div><div class="line">            ++i;</div><div class="line">        }</div><div class="line">        <span class="keywordflow">if</span> (i&lt;Mesh-&gt;getMeshBufferCount())</div><div class="line">        {</div><div class="line">            <span class="comment">// clear the rest</span></div><div class="line">            <span class="keywordflow">for</span> (u32 j=i; j&lt;Mesh-&gt;getMeshBufferCount(); ++j)</div><div class="line">            {</div><div class="line">                Mesh-&gt;getMeshBuffer(j)-&gt;drop();</div><div class="line">            }</div><div class="line">            Mesh-&gt;MeshBuffers.erase(i,Mesh-&gt;getMeshBufferCount()-i);</div><div class="line">        }</div><div class="line">        <span class="comment">// set dirty flag to make sure that hardware copies of this</span></div><div class="line">        <span class="comment">// buffer are also updated, see IMesh::setHardwareMappingHint</span></div><div class="line">        Mesh-&gt;setDirty();</div><div class="line">        Mesh-&gt;recalculateBoundingBox();</div><div class="line">    }</div><div class="line"></div><div class="line">    <span class="comment">// Generate a SMeshBuffer which represents all the vertices and</span></div><div class="line">    <span class="comment">// indices for values of y between y0 and y1, and add it to the</span></div><div class="line">    <span class="comment">// mesh.</span></div><div class="line"></div><div class="line">    <span class="keywordtype">void</span> addstrip(<span class="keyword">const</span> HeightMap &amp;hm, colour_func cf, u16 y0, u16 y1, u32 bufNum)</div><div class="line">    {</div><div class="line">        SMeshBuffer *buf = 0;</div><div class="line">        <span class="keywordflow">if</span> (bufNum&lt;Mesh-&gt;getMeshBufferCount())</div><div class="line">        {</div><div class="line">            buf = (SMeshBuffer*)Mesh-&gt;getMeshBuffer(bufNum);</div><div class="line">        }</div><div class="line">        <span class="keywordflow">else</span></div><div class="line">        {</div><div class="line">            <span class="comment">// create new buffer</span></div><div class="line">            buf = <span class="keyword">new</span> SMeshBuffer();</div><div class="line">            Mesh-&gt;addMeshBuffer(buf);</div><div class="line">            <span class="comment">// to simplify things we drop here but continue using buf</span></div><div class="line">            buf-&gt;drop();</div><div class="line">        }</div><div class="line">        buf-&gt;Vertices.set_used((1 + y1 - y0) * Width);</div><div class="line"></div><div class="line">        u32 i=0;</div><div class="line">        <span class="keywordflow">for</span> (u16 y = y0; y &lt;= y1; ++y)</div><div class="line">        {</div><div class="line">            <span class="keywordflow">for</span> (u16 x = 0; x &lt; Width; ++x)</div><div class="line">            {</div><div class="line">                <span class="keyword">const</span> f32 z = hm.get(x, y);</div><div class="line">                <span class="keyword">const</span> f32 xx = (f32)x/(f32)Width;</div><div class="line">                <span class="keyword">const</span> f32 yy = (f32)y/(f32)Height;</div><div class="line"></div><div class="line">                S3DVertex&amp; v = buf-&gt;Vertices[i++];</div><div class="line">                v.Pos.set(x, Scale * z, y);</div><div class="line">                v.Normal.set(hm.getnormal(x, y, Scale));</div><div class="line">                v.Color=cf(xx, yy, z);</div><div class="line">                v.TCoords.set(xx, yy);</div><div class="line">            }</div><div class="line">        }</div><div class="line"></div><div class="line">        buf-&gt;Indices.set_used(6 * (Width - 1) * (y1 - y0));</div><div class="line">        i=0;</div><div class="line">        <span class="keywordflow">for</span>(u16 y = y0; y &lt; y1; ++y)</div><div class="line">        {</div><div class="line">            <span class="keywordflow">for</span>(u16 x = 0; x &lt; Width - 1; ++x)</div><div class="line">            {</div><div class="line">                <span class="keyword">const</span> u16 n = (y-y0) * Width + x;</div><div class="line">                buf-&gt;Indices[i]=n;</div><div class="line">                buf-&gt;Indices[++i]=n + Width;</div><div class="line">                buf-&gt;Indices[++i]=n + Width + 1;</div><div class="line">                buf-&gt;Indices[++i]=n + Width + 1;</div><div class="line">                buf-&gt;Indices[++i]=n + 1;</div><div class="line">                buf-&gt;Indices[++i]=n;</div><div class="line">                ++i;</div><div class="line">            }</div><div class="line">        }</div><div class="line"></div><div class="line">        buf-&gt;recalculateBoundingBox();</div><div class="line">    }</div><div class="line">};</div></div><!-- fragment --><p> Our event receiver implementation, taken from tutorial 4. </p><div class="fragment"><div class="line"><span class="keyword">class </span>MyEventReceiver : <span class="keyword">public</span> IEventReceiver</div><div class="line">{</div><div class="line"><span class="keyword">public</span>:</div><div class="line">    <span class="comment">// This is the one method that we have to implement</span></div><div class="line">    <span class="keyword">virtual</span> <span class="keywordtype">bool</span> OnEvent(<span class="keyword">const</span> SEvent&amp; event)</div><div class="line">    {</div><div class="line">        <span class="comment">// Remember whether each key is down or up</span></div><div class="line">        <span class="keywordflow">if</span> (event.EventType == irr::EET_KEY_INPUT_EVENT)</div><div class="line">            KeyIsDown[<span class="keyword">event</span>.KeyInput.Key] = <span class="keyword">event</span>.KeyInput.PressedDown;</div><div class="line"></div><div class="line">        <span class="keywordflow">return</span> <span class="keyword">false</span>;</div><div class="line">    }</div><div class="line"></div><div class="line">    <span class="comment">// This is used to check whether a key is being held down</span></div><div class="line">    <span class="keyword">virtual</span> <span class="keywordtype">bool</span> IsKeyDown(EKEY_CODE keyCode)<span class="keyword"> const</span></div><div class="line"><span class="keyword">    </span>{</div><div class="line">        <span class="keywordflow">return</span> KeyIsDown[keyCode];</div><div class="line">    }</div><div class="line"></div><div class="line">    MyEventReceiver()</div><div class="line">    {</div><div class="line">        <span class="keywordflow">for</span> (u32 i=0; i&lt;KEY_KEY_CODES_COUNT; ++i)</div><div class="line">            KeyIsDown[i] = <span class="keyword">false</span>;</div><div class="line">    }</div><div class="line"></div><div class="line"><span class="keyword">private</span>:</div><div class="line">    <span class="comment">// We use this array to store the current state of each key</span></div><div class="line">    <span class="keywordtype">bool</span> KeyIsDown[KEY_KEY_CODES_COUNT];</div><div class="line">};</div></div><!-- fragment --><p> Much of this is code taken from some of the examples. We merely set up a mesh from a heightmap, light it with a moving light, and allow the user to navigate around it. </p><div class="fragment"><div class="line"><span class="keywordtype">int</span> main(<span class="keywordtype">int</span> argc, <span class="keywordtype">char</span>* argv[])</div><div class="line">{</div><div class="line">    <span class="comment">// ask user for driver</span></div><div class="line">    video::E_DRIVER_TYPE driverType=driverChoiceConsole();</div><div class="line">    <span class="keywordflow">if</span> (driverType==video::EDT_COUNT)</div><div class="line">        <span class="keywordflow">return</span> 1;</div><div class="line"></div><div class="line">    MyEventReceiver receiver;</div><div class="line">    IrrlichtDevice* device = createDevice(driverType,</div><div class="line">            core::dimension2du(800, 600), 32, <span class="keyword">false</span>, <span class="keyword">false</span>, <span class="keyword">false</span>,</div><div class="line">            &amp;receiver);</div><div class="line"></div><div class="line">    <span class="keywordflow">if</span>(device == 0)</div><div class="line">        <span class="keywordflow">return</span> 1;</div><div class="line"></div><div class="line">    IVideoDriver *driver = device-&gt;getVideoDriver();</div><div class="line">    ISceneManager *smgr = device-&gt;getSceneManager();</div><div class="line">    device-&gt;setWindowCaption(L<span class="stringliteral">&quot;Irrlicht Example for SMesh usage.&quot;</span>);</div></div><!-- fragment --><p> Create the custom mesh and initialize with a heightmap </p><div class="fragment"><div class="line">TMesh mesh;</div><div class="line">HeightMap hm = HeightMap(255, 255);</div><div class="line">hm.generate(eggbox);</div><div class="line">mesh.init(hm, 50.f, grey, driver);</div><div class="line"></div><div class="line"><span class="comment">// Add the mesh to the scene graph</span></div><div class="line">IMeshSceneNode* meshnode = smgr -&gt; addMeshSceneNode(mesh.Mesh);</div><div class="line">meshnode-&gt;setMaterialFlag(video::EMF_BACK_FACE_CULLING, <span class="keyword">false</span>);</div><div class="line"></div><div class="line"><span class="comment">// light is just for nice effects</span></div><div class="line">ILightSceneNode *node = smgr-&gt;addLightSceneNode(0, vector3df(0,100,0),</div><div class="line">    SColorf(1.0f, 0.6f, 0.7f, 1.0f), 500.0f);</div><div class="line"><span class="keywordflow">if</span> (node)</div><div class="line">{</div><div class="line">    node-&gt;getLightData().Attenuation.set(0.f, 1.f/500.f, 0.f);</div><div class="line">    ISceneNodeAnimator* anim = smgr-&gt;createFlyCircleAnimator(vector3df(0,150,0),250.0f);</div><div class="line">    <span class="keywordflow">if</span> (anim)</div><div class="line">    {</div><div class="line">        node-&gt;addAnimator(anim);</div><div class="line">        anim-&gt;drop();</div><div class="line">    }</div><div class="line">}</div><div class="line"></div><div class="line">ICameraSceneNode* camera = smgr-&gt;addCameraSceneNodeFPS();</div><div class="line"><span class="keywordflow">if</span> (camera)</div><div class="line">{</div><div class="line">    camera-&gt;setPosition(vector3df(-20.f, 150.f, -20.f));</div><div class="line">    camera-&gt;setTarget(vector3df(200.f, -80.f, 150.f));</div><div class="line">    camera-&gt;setFarValue(20000.0f);</div><div class="line">}</div></div><!-- fragment --><p> Just a usual render loop with event handling. The custom mesh is a usual part of the scene graph which gets rendered by drawAll. </p><div class="fragment"><div class="line">    <span class="keywordflow">while</span>(device-&gt;run())</div><div class="line">    {</div><div class="line">        <span class="keywordflow">if</span>(!device-&gt;isWindowActive())</div><div class="line">        {</div><div class="line">            device-&gt;sleep(100);</div><div class="line">            <span class="keywordflow">continue</span>;</div><div class="line">        }</div><div class="line"></div><div class="line">        <span class="keywordflow">if</span>(receiver.IsKeyDown(irr::KEY_KEY_W))</div><div class="line">        {</div><div class="line">            meshnode-&gt;setMaterialFlag(video::EMF_WIREFRAME, !meshnode-&gt;getMaterial(0).Wireframe);</div><div class="line">        }</div><div class="line">        <span class="keywordflow">else</span> <span class="keywordflow">if</span>(receiver.IsKeyDown(irr::KEY_KEY_1))</div><div class="line">        {</div><div class="line">            hm.generate(eggbox);</div><div class="line">            mesh.init(hm, 50.f, grey, driver);</div><div class="line">        }</div><div class="line">        <span class="keywordflow">else</span> <span class="keywordflow">if</span>(receiver.IsKeyDown(irr::KEY_KEY_2))</div><div class="line">        {</div><div class="line">            hm.generate(moresine);</div><div class="line">            mesh.init(hm, 50.f, yellow, driver);</div><div class="line">        }</div><div class="line">        <span class="keywordflow">else</span> <span class="keywordflow">if</span>(receiver.IsKeyDown(irr::KEY_KEY_3))</div><div class="line">        {</div><div class="line">            hm.generate(justexp);</div><div class="line">            mesh.init(hm, 50.f, yellow, driver);</div><div class="line">        }</div><div class="line"></div><div class="line">        driver-&gt;beginScene(video::ECBF_COLOR | video::ECBF_DEPTH, SColor(0xff000000));</div><div class="line">        smgr-&gt;drawAll();</div><div class="line">        driver-&gt;endScene();</div><div class="line">    }</div><div class="line"></div><div class="line">    device-&gt;drop();</div><div class="line"></div><div class="line">    <span class="keywordflow">return</span> 0;</div><div class="line">}</div></div><!-- fragment --><p> That's it! Just compile and play around with the program. </p>
    204. 

  204. </div></div><!-- contents -->
    205. 

  205. <!-- HTML footer for doxygen 1.8.13-->
    206. 

  206. <!-- start footer part -->
    207. 

  207. <p>&nbsp;</p>
    208. 

  208. </body>
    209. 

  209. </html>
    210. 

  210.