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ÎÑÍÎÂÛ 3D ÃÐÀÔÈÊÈ<br>2.1. Çàäàíèå îáúåêòîâ è ñöåí

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<p>Ïîêàæåì çäåñü äîñòàòî÷íî ðàñïðîñòðàíåííóþ ñõåìó çàäàíèÿ 3D îáúåêòîâ è
ñöåí. Ïîäîáíàÿ ñõåìà, êñòàòè, èñïîëüçóåòñÿ, â 3D Studio.

<p>Êàæäàÿ <b>ñöåíà</b> ïðåäñòàâëÿåò ñîáîé ñëåäóþùåå:

<p class=expression>- íàáîð îáúåêòîâ<br>- íàáîð èñòî÷íèêîâ ñâåòà<br>
- íàáîð òåêñòóð<br>- íàáîð êàìåð (õîòÿ îáû÷íî èñïîëüçóåòñÿ îäíà)

<p>Êàæäûé <b>îáúåêò</b> çàäàåòñÿ ñëåäóþùèì:<br>

<table width=480 cellpadding=0 cellspacing=10 border=0 align=center>
<tr><td valign=top>Íàáîð âåðøèí</td><td>
<p>Âåðøèíà îïðåäåëÿåòñÿ ñâîèìè 3D êîîðäèíàòàìè è ñîîòâåòñòâóþùèìè åé
êîîðäèíàòàìè â òåêñòóðå.</td></tr>
<tr><td valign=top>Íàáîð ãðàíåé</td><td>
<p>Ãðàíü îïðåäåëÿåòñÿ òðåìÿ âåðøèíàìè è òåêñòóðîé (âîîáùå ãîâîðÿ, íå
òåêñòóðîé, à ìàòåðèàëîì: êðîìå òåêñòóðû ìîãóò áûòü çàäàíû, íàïðèìåð,
êîýôôèöèåíòû ðàññåèâàíèÿ è îòðàæåíèÿ ñâåòà).</td></tr>
<tr><td valign=top>Ïîâåäåíèå îáúåêòà</td><td><p>Òî åñòü, ðàñïîëîæåíèå (òî
åñòü ñìåùåíèå, îñü ïîâîðîòà, óãîë ïîâîðîòà, êîýôôèöèåíò ìàñøòàáèðîâàíèÿ,
è ò.ä.) â çàâèñèìîñòè îò íîìåðà êàäðà; îáû÷íî çàäàåòñÿ â íåñêîëüêèõ êëþ÷åâûõ
òî÷êàõ è èíòåðïîëèðóåòñÿ ìåæäó íèìè ñ ïîìîùüþ ñïëàéíîâ.</td></tr>
</table>

<p>Êàæäûé <b>èñòî÷íèê ñâåòà</b> çàäàåòñÿ ñëåäóþùèì:
<p class=expression>- ïîëîæåíèå<br>- îðèåíòàöèÿ (òî÷êà, â êîòîðóþ íàïðàâëåí
ýòîò èñòî÷íèê, target)<br>- òèï (ôîíîâûé/íàïðàâëåííûé/íåíàïðàâëåííûé)
<br>- öâåò (îáû÷íî RGB)

<p>Êàæäàÿ <b>òåêñòóðà</b> ïðåäñòàâëÿåò ñîáîé ïðÿìîóãîëüíóþ 2D êàðòèíêó,
÷àñòî áûâàåò ôèêñèðîâàííûõ ðàçìåðîâ (íàïðèìåð, 64x64, 128x128, 256x256).

<p>Êàæäàÿ <b>êàìåðà</b> çàäàåòñÿ ñëåäóþùèì:
<p class=expression>- ïîëîæåíèå (location)<br>- íàïðàâëåíèå (òî÷íåå, òî÷êîé,
â êîòîðóþ íàïðàâëåíà ýòà êàìåðà; target)<br>- óãîë çðåíèÿ (FOV)<br>- óãîë
ïîâîðîòà îòíîñèòåëüíî ñâîåé îñè (roll)

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