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author Yutaka_Kinjyo
date Sat, 02 Oct 2010 13:08:21 +0900
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8 <head>
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9 <title>2010-10-02 (土) シーングラフとPS3 を使ったゲームプログラミング</title>
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12 <meta name="version" content="S5 1.2a2" />
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13 <meta name="author" content="Eric A. Meyer" />
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14 <meta name="company" content="Complex Spiral Consulting" />
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27 <!-- S5 JS -->
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28 <script src="ui/default/slides.js" type="text/javascript"></script>
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29 </head>
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30 <body>
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35 <div id="header"></div>
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36 <div id="footer">
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37 <h1>2010-10-02 (土) シーングラフとPS3 を使ったゲームプログラミング</h1>
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38 <h2></h2>
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39 </div>
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40 </div>
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42 <ol class="xoxo presentation">
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44 </li>
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45 <li class="slide">
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46 <h1>学生向けゲーム作成演習の様子</h1>
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47
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48 </li>
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49
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50 <div class="slide">
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51 <h1>概要</h1>
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52 <ul>
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53 <li>PS3 ゲーム開発用フレームワーク <span class="text-maroon">Cerium</span> の紹介.</li>
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54 <li>SceneGraphによるゲーム作成</li>
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55 <li>Lindaを用いた、ネットワークゲームの作成例の紹介</li>
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56 </ul>
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57 </div>
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58
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59 <div class="slide" id="id17">
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60 <h1>Cerium を用いたゲーム開発</h1>
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61 <div align="center" class="align-center"><img alt="images/cerium_game.jpg" class="align-center" src="images/cerium_game.jpg" style="width: 450px;" /></div>
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62 <div align="center">
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63 SuperDandy3D
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64 </div><ul class="simple">
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65 <li>学生実験でPS3上でのGame作成を行っている</li>
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66 <li>Cerium を用いて学生が作成</li>
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67 <li>ジョイスティックやキーボードでの操作が可能<ul>
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68 <li>SDL を用いて入力値を取得している</li>
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69 </ul>
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70 </li>
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71 </ul>
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72 </div>
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73
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74
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75 <!-- section:Blender -->
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76 <li class="slide">
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77 <h1>3Dモデリング</h1>
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78
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79 まずはゲーム中のオブジェクトのモデリングを行う
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80
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81
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82 </li>
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83
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84 <li class="slide">
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85 <h1>3Dモデルの作成</h1>
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86 <p>Blender: フリーの高機能なモデリングツール</p>
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87 <img src="gazo/blender.jpeg" style="width: 30%">
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88 <img src="gazo/post.png" style="width: 30%">
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89 <img src="gazo/blenderlogo.jpeg" style="width: 30%">
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90 </li>
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91
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92 <li class="slide">
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93 <h1>3Dモデルの作成</h1>
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94 <p>Blender: 作成画面</p>
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95 <img src="gazo/blender2.png" style="width: 60%">
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96 </li>
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97
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98 <div class="slide">
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99 <h1>モデルをCeriumに読ませる.</h1>
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100 <img src="gazo/model2xml.png" style="width: 90%">
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101 <ul>
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102 <li>作成したオブジェクトはBlenderから、スクリプトを使ってCerium用に変換</li>
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103 <li>xmlファイルとなったモデリングデータをCeriumが描画する</li>
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104 </ul>
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105 </div>
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106
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107 <div class="slide">
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108 <h1>PS3,Cell,Cerium</h1>
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109 PS3にはCell Broadband Engine が搭載されている。
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110 </div>
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111
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112 <!-- section:Cerium -->
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113
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114 <li class="slide">
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115 <h1>Cellとは</h1>
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116
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117 <big>Cell</big>とはソニー、東芝、IBM社の3社が共同開発したマイクロプロセッサ<br>
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118 Cellは1基の制御系のプロセッサコア<u>PPE</u>と、8基の演算系プロセッサコア<u>SPE</u>で構成される(Ceriumで扱えるSPEの数は6基)。それぞれ高速なバスで接続されている<br><br>
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119
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120 <table height="100%" width="100%" border="0">
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121 <tr><td align="center" valign="middle">
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122 <img src="gazo/cell1.png" style="width: 35%%"></td></tr>
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123 </table>
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124
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125 <!--<img src="gazo/cell1.png" style="width: 45%%"><br>-->
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126 </li>
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127
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128 <div class="slide">
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129 <h1>Ceriumとは</h1>
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130 <big>Cerium</big>とは当研究室で開発したゲーム開発用フレームワークである<br><br>
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131
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132 <u>Task Manager</u><br>
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133 　タスクと呼ばれる分割されたプログラムを管理する<br>
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134
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135 <u>Scene Graph</u><br>
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136 　ゲーム中のオブジェクトの振る舞いや、ルールを管理する。
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137
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138 <u>Rendering Engine</u><br>
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139 　Cerium独自に開発した描画用のエンジン
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140
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141 <br><br>
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142 の3つの要素から構成される。<br><br>
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143 Ceriumは PS3/Cell、linux, macosx 上で動作する。
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144
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145 </div>
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146
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147 <li class="slide">
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148 <h1>SceneGraph</h1>
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149 <img src="photo/cerium_sg_tree.jpg" style="width 100%" >
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150 <p>Blenderで生成した3Dモデルを独自のXML形式で出力.</p>
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151 <p></p>
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152 <p>SceneGraph の各ノードには <font color="red">MoveTask, Collision Task</font> がある.</p>
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153 </pre>
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154 </li>
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155
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156 <div class="slide">
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157 <h1>SceneGraph</h1>
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158 <img src="gazo/boss.png" style="width: 60%">
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159 </div>
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160
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161 <div class="slide">
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162 <h1>SceneGraph</h1>
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163 <img src="gazo/scenegraph2.png" style="width: 100%">
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164 </div>
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165
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166 <div class="slide">
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167 <h1>SceneGraph</h1>
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168 <img src="gazo/scenegraph1.png" style="width: 100%">
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169 </div>
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170
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171 <div class="slide">
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172 <h1>SceneGraph</h1>
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173 <img src="gazo/move.png" style="width: 70%">
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174 </div>
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175
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176 <div class="slide">
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177 <h1>SceneGraph</h1>
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178 <img src="gazo/collision1.png" style="width: 70%">
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179 </div>
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180
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181 <div class="slide">
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182 <h1>SceneGraph</h1>
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183 <img src="gazo/collision2.png" style="width: 70%">
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184 </div>
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185
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186 <div class="slide">
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187 <h1>SceneGraph</h1>
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188 <img src="gazo/collision3.png" style="width: 70%">
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189 </div>
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190
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191 <div class="slide">
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192 <h1>SceneGraph</h1>
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193 <img src="gazo/collision4.png" style="width: 60%">
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194 </div>
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195
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196 <div class="slide">
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197 <h1>SceneGraph</h1>
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198 <pre>
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199 static void
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200 boss1_move_right() {
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201 x += 1;
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202 if(x > screen_w) {
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203 <font color="red">set_move(boss1_move_left);</font>
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204 }
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205 }
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206
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207 static void
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208 boss1_move_left() {
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209 x -= 1;
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210 if(x < screen_w) {
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211 <font color="red">set_move(boss1_move_right);</font>
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212 }
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213 }
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214 </pre>
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215 </div>
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216
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217
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218 <div class="slide">
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219 <h1>SceneGraph</h1>
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220 <img src="gazo/boss2.png" style="width: 60%">
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221 </div>
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222
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223 <div class="slide">
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224 <h1>SceneGraph</h1>
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225 <img src="gazo/boss3.png" style="width: 70%">
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226 </div>
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227
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228 <div class="slide">
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229 <h1>SceneGraph</h1>
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230 <img src="gazo/boss4.png" style="width: 60%">
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231 </div>
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232
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233 <div class="slide">
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234 <h1>SceneGraph</h1>
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235 <img src="gazo/hito.png" style="width: 60%">
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236 </div>
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237
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238 <div class="slide">
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239 <h1>SceneGraph</h1>
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240 <p><pre> SceneGraph を<br>
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241 MoveTask<br>
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242 CollisionTask<br>
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243 で書き換えていく<br>
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244 MoveTask, CollisionTask は、ステートパターンで<br>
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245 入れ換えられる<br>
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246 </pre>
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247 これで、すべて書ける。<br>
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248 <p></div>
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249
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250
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251 <div class="slide">
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252 <h1>つまり、</h1>
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253 <pre> SceneGraph の構築<br>
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254 MoveTask<br>
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255 CollsionTask<br>
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256 </pre>
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257 だけを書けば、あとは、Cerium Task Manager が自動的に並列に実行管理してくれる<br>
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258 <p></div>
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259
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260 <div class="slide">
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261 <h1>SceneGraphの結果を描画</h1>
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262 SceneGraphで操作したオブジェクトの結果を、レンダリングエンジンで描画する
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263 </div>
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264
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265
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266 <div class="slide">
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267 <h1>Rendering Engineの構成</h1>
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268 <p class="ex2">Rendering Engineは主に3つのタスクから構成されている</p>
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269
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270 <u>CreatePolygonタスク</u><br>
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271 　モデリングデータからポリゴンを生成するタスク<br>
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272 <u>CreateSpanタスク</u><br>
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273 　生成されたポリゴンを水平な直線(Span)に分割するタスク<br>
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274 <u>DrawSpanタスク</u><br>
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275 　Spanのデータを元に、画面に描画するタスク<br>
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276
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277 </div>
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278
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279 <div class="slide">
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280 <h1>Rendering Engineの流れ</h1>
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281
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282 <img src="gazo/rendering1.png" style="display:block; width: 60%; margin: auto;">
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283
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284 <u><big>CreatePolygon</big></u>:<br>
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285 SceneGraph をもとに回転や並行移動したポリゴンを、モデルデータから生成するタスク<br>
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286 ポリゴンは三角形である<br>
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287 回転や平行移動はSceneGraphが持っている変換行列を用いる
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288 </div>
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289
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290 <div class="slide">
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291 <h1>Rendering Engineの流れ</h1>
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292
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293 <img src="gazo/rendering2.png" style="display:block; width: 60%; margin: auto;">
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294
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295 <div style="float: left; width: 50%;"><u><big>CreateSpan</big></u>:<br>
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296 三角形のポリゴンを線に分割するタスク。
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297 生成されたポリゴンを水平な直線(Span)の集合へと分割する<br>
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298 Spanとは1ドット単位で分割された線
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299 </div>
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300
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301 <img src="gazo/span2.png" style="display:block; width: 38%; float: right; margin-top:5%">
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302
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303
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304 </div>
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305
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306 <div class="slide">
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307 <h1>Rendering Engineの流れ</h1>
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308 <br>
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309 <img src="gazo/rendering3.png" style="display:block; width: 65%; margin: auto;">
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310
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311 <u><big>DrawSpan</big></u>:<br>
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312 Spanを画面へ描画するタスク<br>
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313 Spanを1Dotずつ見ていき、対応する画面の1Dotに色をつける<br>
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314 色はSpanに対応する画像の色をみて決める
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315 </div>
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316
7
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317 <div class="slide">
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318 <h1>TaskManager</h1>
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319 SceneGraph, RenderingEngineのTaskを管理し、SPEに
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320 </div>
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321
0
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322 <li class="slide">
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323 <h1>Cerium Task Manager</h1>
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324 <p></p>
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325 <ul>
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326 <li>Open/GL Mesa に Cell driver を書いたが、メインメモリに依存しすぎていたため、動作が遅くなってしまった。</li>
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327 <li>Task base で書く必要がある。</li>
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328 <li>Video Chip が公開されていないので、Rendering Engine も用意すべき</li>
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329 <li>SPE の Local Store は 256KB なので、コードの管理も必要</li>
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330 </ul>
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331 <br>
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332 このような経緯で、Cell Task Manager を作成することになった。
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333 </li>
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334
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335 <li class="slide">
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336 <h1>Cerium Task Manager の特徴</h1>
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337
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338 <pre> PPU/SPUで、Task の互換性がある<br>
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339 SPU上の最適化は当面禁止<br>
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340 OS X 上でも動く<br>
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341 コードのデバッグはOS X 上でやる<br>
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342 並列化とチューニングだけPS3上で行なう<br>
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343 SPU上のメモリをCode と Data を Hash とメモリリストで管理する<br>
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344 SPUに入り切らない巨大なTaskでも実行できる<br>
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345 </pre>
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346 </li>
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347
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348
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349 <li class="slide">
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350 <h1>並列アーキテクチャは並列でないと...</h1>
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351 特に、Cell/PS3 は、SPUで実行しないとだめ<br>
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352 <pre> 既存のプログラミングでは、まったく歯が立たない<br>
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353 </pre>
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354 トリビアルなプログラムでも、並列にする必要がある<br>
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355 <p></li>
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356 <li class="slide">
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357 <h1>やってはいけないこと</h1>
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358 <pre> 最初に大量のTaskをすべて作る<br>
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359 Task が自分でデータを拾って来る<br>
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360 Task 同士が、同期を行なう<br>
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361 </pre>
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362 </li>
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363
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364 <!-- section:Linda -->
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365
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366 <li class="slide">
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367 <h1>まとめ</h1>
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368 Blender/Linux/Cerium を用いたオープンソースなゲームフレームワーク<br>
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369 <p>SceneGraphを作れば、move/collision を記述するだけで並列に実行される<br>
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370 <p>ソフトウェアレンダリングなんで、なんでも自分で書ける<br>
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371 <p>
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372 </li>
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373
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374 <li class="slide">
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375 <h1>今後の課題</h1>
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376 </li>