制作过场动画：动画和摄像机控制

Tracker animations consist of a number of tracks and each track indicates how some parameter changes over the specified time. It can control some render effect or it can be bound to a node in the world. If more properties need to be animated for one node at the same time, simply a number of tracks are created for it. For example, with tracks, you can create animations that:Tracker 动画由许多轨道组成，每个轨道指示某些参数在指定时间内如何变化。它可以控制一些渲染效果，也可以绑定到世界中的一个节点。如果需要同时为一个节点设置多个属性，只需为其创建多个轨道。例如，使用轨道，您可以创建以下动画：

• Move nodes, toggle skinned animation, control emission of particles, etc.移动节点、切换蒙皮动画、控制粒子发射等。
• Change any of material settings and modify properties for various changeable effects. For example, you can change the texture and material reflectivity to create the effect of rain.更改任何材质设置并修改各种可变效果的属性。例如，您可以更改纹理和材质反射率来创建下雨的效果。
• Alter rendering settings: change the background color, apply post-process effects, control stereo and much more.更改渲染设置：更改背景颜色、应用后期处理效果、控制立体声等等。
• Set up cameras.设置摄像头。

A track is composed of key frames, which are snapshots of the parameter at a certain time during the animation. Each key frame stores a time and the parameter change (new value for the parameter or whether is enabled or disabled). For example, for node position track, a key frame sets a new position of the node along one of the axes; for the node enabling track, a key can indicate that a node is disabled for rendering.轨迹由关键帧组成，它们是动画过程中某个时间参数的快照。每个关键帧存储一个时间和参数变化（参数的新值或是否启用或禁用）。例如，对于节点位置轨迹，关键帧设置节点沿其中一个轴的新位置；对于节点启用轨道，键可以指示节点被禁用以进行渲染。

This parameter value set in the key frame is applied between the current keyframe and the next one. Depending on the transition mode, the key frame values can be switched abruptly or smoothly interpolated:在关键帧中设置的这个参数值应用于当前关键帧和下一个关键帧之间。根据过渡模式，关键帧值可以突然切换或平滑插值：

• Linear interpolation can be used, for instance, for a node scale track.例如，线性插值可用于节点比例轨迹。
• Bezier interpolation will provide a smooth curve for a node position track.贝塞尔插值将为节点位置轨迹提供平滑曲线。

	Add an animation track. In case of a simple track (for example, the track that toggles a node on and off), only a track line will be available. If the track controls parameter with values, key frames will also be present in the graph.添加动画轨迹。如果是简单的轨道（例如，打开和关闭节点的轨道），则只有一条轨道线可用。如果轨道控制参数的值，关键帧也将出现在图表中。
	Remove the selected animation track.移除选定的动画轨迹。
	Clone the selected animation track.克隆选定的动画轨迹。
	Move the selected animation track up the list.在列表中向上移动选定的动画轨迹。
	Move the selected animation track down the list.在列表中向下移动选定的动画轨迹。
	Save the parameter value from the Editor into the track. It is available only when the track is disabled. See details.将编辑器中的参数值保存到轨道中。仅当轨道是可用的禁用.看细节.
	Toggles the track on and off (turns its animation on and off).打开和关闭轨道（打开和关闭其动画）。
	Toggles displaying a track graph on and off (not available for simple tracks).打开和关闭显示轨迹图（不适用于简单轨迹）。
Load	Load the *.track file. Tracks from the loaded file will be displayed on the tracks list.加载 *.track 文件。加载文件中的曲目将显示在曲目列表中。 注意 If you have some tracks in the list, you should save them before loading the track file. Otherwise, they will be lost as the loaded tracks will be displayed instead of the current ones.如果列表中有一些曲目，则应在加载曲目文件之前保存它们。否则，它们将丢失，因为将显示加载的曲目而不是当前曲目。 The button can be found in the upper right corner of the Tracker. 按钮位于 Tracker 的右上角。
Save	Save all current tracks into the *.track file. The button can be found in the upper right corner of the Tracker.将所有当前曲目保存到 *.track 文件中。 按钮位于 Tracker 的右上角。
Clear	Delete all tracks from the tracks list. The button can be found in the upper right corner of the Tracker.从曲目列表中删除所有曲目。 按钮位于 Tracker 的右上角。

Tracker also displays information on the animating objects and allows specifying additional animation settings for each track. For example, you can change a node or a material to which the track is bound. Tracker 还显示有关动画对象的信息，并允许为每个轨道指定其他动画设置。例如，您可以更改轨道绑定到的节点或材质。