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  252. <div class="edit-this-page"><a href="https://github.com/jMonkeyEngine/wiki/edit/master/docs/modules/ROOT/pages/jme3/advanced/camera.adoc">Edit this Page</a></div>
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  254. <div class="content">
  255. <article class="doc">
  256. <h1 class="page">The jME3 Camera</h1>
  257. <div id="preamble">
  258. <div class="sectionbody">
  259. <div class="admonitionblock note">
  260. <table>
  261. <tr>
  262. <td class="icon">
  263. <i class="fa icon-note" title="Note"></i>
  264. </td>
  265. <td class="content">
  266. <div class="paragraph">
  267. <p>By default, the mouse pointer is invisible, and the mouse is set up to control the camera rotation.</p>
  268. </div>
  269. </td>
  270. </tr>
  271. </table>
  272. </div>
  273. </div>
  274. </div>
  275. <div class="sect1">
  276. <h2 id="default-camera"><a class="anchor" href="#default-camera"></a>Default Camera</h2>
  277. <div class="sectionbody">
  278. <div class="paragraph">
  279. <p>The default com.jme3.renderer.Camera object is <code>cam</code> in com.jme3.app.Application.</p>
  280. </div>
  281. <div class="paragraph">
  282. <p>The camera object is created with the following defaults:</p>
  283. </div>
  284. <div class="ulist">
  285. <ul>
  286. <li>
  287. <p>Width and height are set to the current Application&#8217;s settings.getWidth() and settings.getHeight() values.</p>
  288. </li>
  289. <li>
  290. <p>Frustum Perspective:</p>
  291. <div class="ulist">
  292. <ul>
  293. <li>
  294. <p>Frame of view angle of 45° along the Y axis</p>
  295. </li>
  296. <li>
  297. <p>Aspect ratio of width divided by height</p>
  298. </li>
  299. <li>
  300. <p>Near view plane of 1 wu</p>
  301. </li>
  302. <li>
  303. <p>Far view plane of 1000 wu</p>
  304. </li>
  305. </ul>
  306. </div>
  307. </li>
  308. <li>
  309. <p>Start location at (0f, 0f, 10f).</p>
  310. </li>
  311. <li>
  312. <p>Start direction is looking at the origin.</p>
  313. </li>
  314. </ul>
  315. </div>
  316. <table class="tableblock frame-all grid-all stretch">
  317. <colgroup>
  318. <col style="width: 50%;">
  319. <col style="width: 50%;">
  320. </colgroup>
  321. <thead>
  322. <tr>
  323. <th class="tableblock halign-left valign-top">Method</th>
  324. <th class="tableblock halign-left valign-top">Usage</th>
  325. </tr>
  326. </thead>
  327. <tbody>
  328. <tr>
  329. <td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
  330. <p>cam.getLocation(), setLocation()</p>
  331. </div></div></td>
  332. <td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
  333. <p>The camera position</p>
  334. </div></div></td>
  335. </tr>
  336. <tr>
  337. <td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
  338. <p>cam.getRotation(), setRotation()</p>
  339. </div></div></td>
  340. <td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
  341. <p>The camera rotation</p>
  342. </div></div></td>
  343. </tr>
  344. <tr>
  345. <td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
  346. <p>cam.getLeft(), setLeft()</p>
  347. </div></div></td>
  348. <td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
  349. <p>The left axis of the camera</p>
  350. </div></div></td>
  351. </tr>
  352. <tr>
  353. <td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
  354. <p>cam.getUp(), setUp()</p>
  355. </div></div></td>
  356. <td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
  357. <p>The up axis of the camera, usually Vector3f(0,1,0)</p>
  358. </div></div></td>
  359. </tr>
  360. <tr>
  361. <td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
  362. <p>cam.getDirection()</p>
  363. </div></div></td>
  364. <td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
  365. <p>The vector the camera is facing</p>
  366. </div></div></td>
  367. </tr>
  368. <tr>
  369. <td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
  370. <p>cam.getAxes(), setAxes(left,up,dir)</p>
  371. </div></div></td>
  372. <td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
  373. <p>One accessor for the three properties left/up/direction.</p>
  374. </div></div></td>
  375. </tr>
  376. <tr>
  377. <td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
  378. <p>cam.getFrame(), setFrame(loc,left,up,dir)</p>
  379. </div></div></td>
  380. <td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
  381. <p>One accessor for the four properties location/left/up/direction.</p>
  382. </div></div></td>
  383. </tr>
  384. <tr>
  385. <td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
  386. <p>cam.resize(width, height, fixAspect)</p>
  387. </div></div></td>
  388. <td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
  389. <p>Resize an existing camera object while keeping all other settings. Set fixAspect to true to adjust the aspect ratio (?)</p>
  390. </div></div></td>
  391. </tr>
  392. <tr>
  393. <td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
  394. <p>cam.setFrustum( near, far, left, right, top, bottom )</p>
  395. </div></div></td>
  396. <td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
  397. <p>The frustum is defined by the near/far plane, left/right plane, top/bottom plane (all distances as float values)</p>
  398. </div></div></td>
  399. </tr>
  400. <tr>
  401. <td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
  402. <p>cam.setFrustumPerspective( fovY, aspect ratio, near, far)</p>
  403. </div></div></td>
  404. <td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
  405. <p>The frustum is defined by view angle along the Y axis (in degrees), aspect ratio, and the near/far plane.</p>
  406. </div></div></td>
  407. </tr>
  408. <tr>
  409. <td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
  410. <p>cam.lookAt(target,up)</p>
  411. </div></div></td>
  412. <td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
  413. <p>Turn the camera to look at Coordinate target, and rotate it around the up axis.</p>
  414. </div></div></td>
  415. </tr>
  416. <tr>
  417. <td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
  418. <p>cam.setParallelProjection(false)</p>
  419. </div></div></td>
  420. <td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
  421. <p>Normal perspective</p>
  422. </div></div></td>
  423. </tr>
  424. <tr>
  425. <td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
  426. <p>cam.setParallelProjection(true)</p>
  427. </div></div></td>
  428. <td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
  429. <p>Parallel projection perspective</p>
  430. </div></div></td>
  431. </tr>
  432. <tr>
  433. <td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
  434. <p>cam.getScreenCoordinates(worldPos)</p>
  435. </div></div></td>
  436. <td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
  437. <p>Converts the given position from world space to screen space.</p>
  438. </div></div></td>
  439. </tr>
  440. </tbody>
  441. </table>
  442. <div class="admonitionblock tip">
  443. <table>
  444. <tr>
  445. <td class="icon">
  446. <i class="fa icon-tip" title="Tip"></i>
  447. </td>
  448. <td class="content">
  449. <div class="paragraph">
  450. <p>After you change view port, frustum, or frame, call <code>cam.update();</code></p>
  451. </div>
  452. </td>
  453. </tr>
  454. </table>
  455. </div>
  456. </div>
  457. </div>
  458. <div class="sect1">
  459. <h2 id="flyby-camera"><a class="anchor" href="#flyby-camera"></a>FlyBy Camera</h2>
  460. <div class="sectionbody">
  461. <div class="paragraph">
  462. <p>The <code>flyCam</code> class field gives you access to an AppState that extends the default camera in <code>com.jme3.app.SimpleApplication</code> with more features. The input manager of the <code>com.jme3.input.FlyByCamera</code> AppState is preconfigured to respond to the WASD keys for walking forwards and backwards, and strafing to the sides; move the mouse to rotate the camera (&#8220;Mouse Look&#8221;), scroll the mouse wheel for zooming in or out. The QZ keys raise or lower the camera vertically.</p>
  463. </div>
  464. <div class="listingblock">
  465. <div class="content">
  466. <pre class="highlightjs highlight"><code>Q W up forw
  467. A S D --&gt; left back right
  468. Z down</code></pre>
  469. </div>
  470. </div>
  471. <table class="tableblock frame-all grid-all stretch">
  472. <colgroup>
  473. <col style="width: 50%;">
  474. <col style="width: 50%;">
  475. </colgroup>
  476. <thead>
  477. <tr>
  478. <th class="tableblock halign-left valign-top">Method</th>
  479. <th class="tableblock halign-left valign-top">Usage</th>
  480. </tr>
  481. </thead>
  482. <tbody>
  483. <tr>
  484. <td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
  485. <p>flyCam.setEnabled(true);</p>
  486. </div></div></td>
  487. <td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
  488. <p>Activate the flyby cam</p>
  489. </div></div></td>
  490. </tr>
  491. <tr>
  492. <td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
  493. <p>flyCam.setMoveSpeed(10);</p>
  494. </div></div></td>
  495. <td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
  496. <p>Control the move speed</p>
  497. </div></div></td>
  498. </tr>
  499. <tr>
  500. <td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
  501. <p>flyCam.setRotationSpeed(10);</p>
  502. </div></div></td>
  503. <td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
  504. <p>Control the rotation speed</p>
  505. </div></div></td>
  506. </tr>
  507. <tr>
  508. <td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
  509. <p>flyCam.setDragToRotate(true)</p>
  510. </div></div></td>
  511. <td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
  512. <p>Forces the player to keep mouse button pressed to rotate camera, typically used for Applets. If false (default), all mouse movement will be captured and interpreted as rotations.</p>
  513. </div></div></td>
  514. </tr>
  515. </tbody>
  516. </table>
  517. <div class="paragraph">
  518. <p>The FlyByCamera is active by default, but you can change all these defaults for your game.</p>
  519. </div>
  520. </div>
  521. </div>
  522. <div class="sect1">
  523. <h2 id="chase-camera"><a class="anchor" href="#chase-camera"></a>Chase Camera</h2>
  524. <div class="sectionbody">
  525. <div class="paragraph">
  526. <p>jME3 also supports an optional Chase Cam that can follow a moving target Spatial (<code>com.jme3.input.ChaseCamera</code>). When you use the chase cam, the player clicks and hold the mouse button to rotate the camera around the camera target. You can use a chase cam if you need the mouse pointer visible in your game.</p>
  527. </div>
  528. <div class="listingblock">
  529. <div class="content">
  530. <pre class="highlightjs highlight"><code class="language-java hljs" data-lang="java">flyCam.setEnabled(false);
  531. ChaseCamera chaseCam = new ChaseCamera(cam, target, inputManager);</code></pre>
  532. </div>
  533. </div>
  534. <table class="tableblock frame-all grid-all stretch">
  535. <colgroup>
  536. <col style="width: 50%;">
  537. <col style="width: 50%;">
  538. </colgroup>
  539. <thead>
  540. <tr>
  541. <th class="tableblock halign-left valign-top">Method</th>
  542. <th class="tableblock halign-left valign-top">Usage</th>
  543. </tr>
  544. </thead>
  545. <tbody>
  546. <tr>
  547. <td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
  548. <p>chaseCam.setSmoothMotion(true);</p>
  549. </div></div></td>
  550. <td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
  551. <p>Interpolates a smoother acceleration/deceleration when the camera moves.</p>
  552. </div></div></td>
  553. </tr>
  554. <tr>
  555. <td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
  556. <p>chaseCam.setChasingSensitivity(5f)</p>
  557. </div></div></td>
  558. <td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
  559. <p>The lower the chasing sensitivity, the slower the camera will follow the target when it moves.</p>
  560. </div></div></td>
  561. </tr>
  562. <tr>
  563. <td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
  564. <p>chaseCam.setTrailingSensitivity(0.5f)</p>
  565. </div></div></td>
  566. <td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
  567. <p>The lower the traling sensitivity, the slower the camera will begin to go after the target when it moves. Default is 0.5;</p>
  568. </div></div></td>
  569. </tr>
  570. <tr>
  571. <td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
  572. <p>chaseCam.setRotationSensitivity(5f)</p>
  573. </div></div></td>
  574. <td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
  575. <p>The lower the sensitivity, the slower the camera will rotate around the target when the mosue is dragged. Default is 5.</p>
  576. </div></div></td>
  577. </tr>
  578. <tr>
  579. <td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
  580. <p>chaseCam.setTrailingRotationInertia(0.1f)</p>
  581. </div></div></td>
  582. <td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
  583. <p>This prevents the camera to stop too abruptly when the target stops rotating before the camera has reached the target&#8217;s trailing position. Default is 0.1f.</p>
  584. </div></div></td>
  585. </tr>
  586. <tr>
  587. <td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
  588. <p>chaseCam.setDefaultDistance(40);</p>
  589. </div></div></td>
  590. <td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
  591. <p>The default distance to the target at the start of the application.</p>
  592. </div></div></td>
  593. </tr>
  594. <tr>
  595. <td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
  596. <p>chaseCam.setMaxDistance(40);</p>
  597. </div></div></td>
  598. <td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
  599. <p>The maximum zoom distance. Default is 40f.</p>
  600. </div></div></td>
  601. </tr>
  602. <tr>
  603. <td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
  604. <p>chaseCam.setMinDistance(1);</p>
  605. </div></div></td>
  606. <td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
  607. <p>The minimum zoom distance. Default is 1f.</p>
  608. </div></div></td>
  609. </tr>
  610. <tr>
  611. <td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
  612. <p>chaseCam.setMinVerticalRotation(-FastMath.PI/2);</p>
  613. </div></div></td>
  614. <td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
  615. <p>The minimal vertical rotation angle of the camera around the target. Default is 0.</p>
  616. </div></div></td>
  617. </tr>
  618. <tr>
  619. <td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
  620. <p>chaseCam.setDefaultVerticalRotation(-FastMath.PI/2);</p>
  621. </div></div></td>
  622. <td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
  623. <p>The default vertical rotation angle of the camera around the target at the start of the application.</p>
  624. </div></div></td>
  625. </tr>
  626. <tr>
  627. <td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
  628. <p>chaseCam.setDefaultHorizontalRotation(-FastMath.PI/2);</p>
  629. </div></div></td>
  630. <td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
  631. <p>The default horizontal rotation angle of the camera around the target at the start of the application.</p>
  632. </div></div></td>
  633. </tr>
  634. </tbody>
  635. </table>
  636. </div>
  637. </div>
  638. </article>
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