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0001 <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
0002 "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
0003 <html xmlns="http://www.w3.org/1999/xhtml">
0004 <head>
0005 <title></title>
0006 <meta name="generator" content="HTML::TextToHTML v2.51"/>
0007 </head>
0008 <body>
0009 <p><strong>DIRECT SCENE INTERACTIONS</strong>
0010
0011 </p>
0012 </br>
0013 <p />
0014 Viewer interactions with the camera are summarized below. In each case the interaction is listed, along with
0015 description and user actions required to achieve it.
0016 <p />
0017
0018 <img src="cameraInteraction.png" >
0019
0020 <p /> <ul>
0021 <li> <strong>Note for orthographic cameras</strong>:<br>There is no field of view of view/focal length dollying and zooming producing an identical scaling action.<br> There is a fixed eye direction so the Orbit` action is disabled.
0022
0023 </li></ul>
0024 <p /> <ul>
0025 <li> <strong>Note for perspective cameras</strong>:<br>Dollying (moving the camera backwards/forwards) and zooming are often confused, and may appear very similar.<br> When you dolly the camera the lens focal length does not change, hence the distortions associated with the projections are unaffected. However the movement can result in objects coming through the front` of the camera and disappearing.<br> When you zoom, the camera does not move hence clipping of near objects is unaffected. However with extremely small zooms (FOV large/focal length short) noticeable distortions, causing straight lines to become curved, can be seen with objects near the camera the fisheye` lens effect.<br> <strong>Generally dollying is more `natural`, but you may need to use both to achieve the desired perspective and eye position particularly when you are working inside or very close to 3D objects</strong>.
0026 </li></ul>
0027 <p />
0028
0029 <br/>
0030 <p><strong> KEY ACTIONS</strong>
0031 <dl>
0032 </p>
0033 <dd>
0034 <p> j --- zoom in</p>
0035 <p> k --- zoom out</p>
0036 <p> Arrow Keys --- pan (truck) across scene</p>
0037 <p> Home* --- reset current camera </p>
0038 </p>
0039 </dd></dl>
0040 *Note: Home key does not exsists on Mac. The same action is created
0041 with 'fn + LeftArrow' keys.
0042 </br>
0043 <p><strong>MUSE ACTIONS</strong></p>
0044
0045
0046
0047 <p> You can rotate(orbit) the scene by holding the left mouse button and moving
0048 the mouse (perspective camera, needs to be enabled for orthograpic camers).
0049 By default, the scene will be rotated about its center. To select
0050 arbitrary center selected "PickCameraCenter" in popup context menu.
0051 </p>
0052 <p> You can pan (truck) the camera using the middle mouse button or arrow keys.
0053 </p>
0054 <p> You can zoom the camera by dragging side to side holding the right
0055 mouse button (in perspective mode the camera is translated along viewing axis).
0056 </p>
0057
0058 <p><strong>MODIFIER KEYS FOR ROTATION, PANNING, AND ZOOMING:</strong> </p>
0059 <pre>
0060 Shift -- accelerate by factor 10</br>
0061 Ctrl -- decelerate by factor 10</br>
0062 Ctrl+Shift -- decelerate by factor 100</br>
0063 </pre>
0064
0065
0066
0067
0068 <BR>
0069 </body>
0070 </html>
