从Unity迁移到UNIGINE：内容创建

In Unity software, you are likely to be used to using the LOD Group component enabling you to operate several detail levels, the active LOD is defined by the threshold based on the ratio of the mesh's screen-space height to the total screen height.在Unity软件中，您可能习惯于使用LOD Group组件来操作多个细节级别，活动LOD由基于网格的屏幕空间高度与总屏幕高度之比的阈值定义。

In UNIGINE, levels of detail are configured based on distances — in a more low-level manner to make fine tuning available. Surfaces have visibility settings for this purpose. You can set the minimum and maximum visibility distances from the camera for each surface. For Cross Fading use the Minimum Fade and Maximum Fade values.在UNIGINE中，根据距离配置详细程度-以更底层的方式进行微调。表面有可见性设置以此目的。您可以为每个表面设置距相机的最小和最大可见距离。对于交叉淡入淡出，请使用Minimum Fade和Maximum Fade值。

注意

Note the -inf value in one of the fields. You can use inf (Infinity) and -inf (-Infinity) values for parameters supporting this format to define the lowest and highest possible values respectively.注意其中一个字段中的-inf值。您可以将inf（Infinity）和-inf（-Infinity）值用于支持此格式的参数，以分别定义最低和最高值。

Automatic creation of LODs upon importing a model is described in the FBX Import Guide. And if you need fine control over LODs, you can make use of Combine By Postfixes option and merge prepared separate objects with certain postfixes in their names representing LODs. For more details on configuring LODs refer to the dedicated article.在导入模型时描述了自动创建LOD。 FBX导入指南。有关配置LOD的更多详细信息，请参阅专用文章。

FBX models containing bone-animated skinned meshes create animation clips when imported in both engines. In UNIGINE, such clips are represented by .anim assets.包含骨骼动画蒙皮网格物体的FBX模型在两个引擎中导入时都会创建动画剪辑。在UNIGINE中，此类剪辑由.anim资产表示。

注意

当前，每个网格仅支持一个动画剪辑。要对多个动画剪辑进行操作，您需要为每个动画创建一个单独的FBX。

UNIGINE imports only skeletal animation. Skinned Mesh object is an analog for the Unity Skinned Mesh Renderer component for handling bone animations.Skinned Mesh对象是Unity Skinned Mesh Renderer组件的类似物，用于处理骨骼动画。

Unity software provides a sophisticated animation system (sometimes referred to as 'Mecanim'). It implies using Animator Controller — a state machine that manages animation states and transitions between them.Unity软件提供了复杂的动画系统（有时称为'Mecanim'）。它意味着使用Animator Controller —一种状态机，用于管理动画状态和它们之间的过渡。

UNIGINE skinned animation system is focused on operating animation layers: you can configure multiple layers with various animation clips and perform blending between them by using API methods.UNIGINE蒙皮动画系统专注于操作动画层：您可以使用各种动画剪辑配置多层，并使用API方法在它们之间执行混合。

An example of animation using two layers使用两层动画的示例

For more details refer to the following articles:有关更多详细信息，请参阅以下文章：

• ObjectMeshSkinned class API referenceObjectMeshSkinned类API参考
• Animation section of C# Component Samples的动画部分C＃组件样本

Blend Shapes混合形状#

In Unity software, light sources are represented by the Light component. UNIGINE provides several types of light sources similar to the ones of Unity software.在Unity软件中，光源由Light组件表示。 UNIGINE提供了几种类型的光源类似于Unity软件。

Light Source	Unity software	UNIGINE
A light source located at a point and sending light out in all directions equally位于一个点上的光源，可以均匀地向所有方向发射光	Point Light	Light Omni
A light source type providing a cone-shaped region of illumination提供锥形照明区域的光源类型	Spot Light	Light Projected
A type simulating an infinitely distant light source and casting parallel beams onto the scene 一种模拟无限远的光源并将平行光束投射到场景上的类型	Directional Light	Light World
An area light that illuminates objects in different directions at once 区域照明一次照亮不同方向上的物体	Area Light: Rectangle and Disc shapeArea Light：矩形和圆盘形状	You can create a custom base material with complex effects for meshes and decals via the visual Material Editor. Unlike in Unity Shader Graph, it outputs a material; there is no master stack with Vertex and Fragment contexts here, the main node is Material that takes parameters for all shaders.Shape Type: Sphere, Capsule and Rectangle形状类型：球体，胶囊和矩形
Emissive objects emitting light across their surface area 发光物体在其表面积上发光	Emissive materials发光材料	Emission排放
Global flat filling lighting 全球平面照明	Ambient light环境光	Environment Ambient Lighting, Environment Probe环境环境照明，Environment Probe

Shadows暗影#

Lights Cookies灯饼干#

For texture modulated lights, Unity software has a special type of textures: Cookie. High Definition RP also provides support for IES Light Profiles for more realistic light sources.对于纹理调制的灯光，Unity软件具有特殊的纹理类型：Cookie。

In UNIGINE, you can use an arbitrary flat diffuse or albedo texture, as well as an IES-profile, in the Texture parameter of Light Projected. The same way you can apply texture modulation to Light Omni by using a cubemap texture.在UNIGINE中，可以在Light Projected的Texture参数中使用任意的平面漫反射或反照率纹理。通过使用立方体贴图纹理，可以将纹理调制应用于Light Omni的方法相同。

Modulation by texture通过纹理调制

Modulation by cubemapIES Profile通过立方体贴图进行调制

In Unity Editor, scene environment settings are placed in the Lighting window (menu: Window > Rendering > Lighting Settings). The Environment section contains settings for the skybox, diffuse lighting and environment reflections.在Unity Editor中，场景环境设置位于Lighting窗口中（菜单：Window > Rendering > Lighting Settings）。 Environment部分包含天空盒，漫射照明和环境反射的设置。

In UNIGINE, similar Environment Settings are available in >Render Settings (choose Window -> Settings in the main menu, then in the Settings window go to Runtime -> World -> Render -> Environment).在UNIGINE中，类似的Environment Settings在>Render Settings中可用（在主菜单中选择Window -> Settings，然后在“设置”窗口中转到Runtime -> World -> Render -> Environment）。

UNIGINE provides three environment presets, by configuring which you can create a smooth transition between different weather conditions.通过配置，UNIGINE提供了三个环境预设，您可以在不同的天气条件之间创建平稳的过渡。

In order to achieve physically correct atmosphere rendering, UNIGINE's environment system simulates Scattering by interpolating certain LUTs (Look-UP Textures). When configuring environment lighting you should consider all the settings combined. For more details visit the dedicated article.为了实现物理上正确的大气渲染，UNIGINE的环境系统进行了模拟散射通过内插某些LUT（查找纹理）。配置环境照明时，应考虑所有设置的组合。有关更多详细信息，请访问专用文章。

You can set a cubemap texture as the Environment Texture (a Unity Skybox counterpart) for both sky color and reflections.您可以为天空颜色和反射设置立方体贴图纹理作为环境纹理（对应的Unity Skybox）。

注意

If you need to change reflections locally, for example indoors, use Environment Probe with a unique cubemap.如果需要在本地（例如在室内）更改反射，则将Environment Probe与唯一的立方体贴图一起使用。

Additionally, Unity Editor allows specifying a different environment skybox for the camera by using the Skybox script.此外，Unity Editor允许通过使用Skybox脚本为摄像机指定其他环境天空盒。

In UNIGINE, you can use the Sky object recreating the atmosphere in the scene. It can represent a hemisphere or a full sphere with a cubemap assigned, tiled with clouds texture to produce plausible and inexpensive dynamic clouds.在UNIGINE中，可以使用Sky对象在场景中重新创建气氛。它可以代表已分配了立方体贴图的半球或整个球体，并用云纹理平铺以生成合理且廉价的动态云。

注意

If your project requires simulating lifelike clouds, take a look at the Volumetric Clouds.如果您的项目需要模拟逼真的云，请看一下体积云。

Fog多雾路段#

Unity software provides a set of advanced systems that model indirect lighting significantly improving the realistic look of the scene. So does UNIGINE. This section lists Unity GI techniques and ways to get the same or similar results in UNIGINE.Unity软件提供了一套高级系统，可对间接照明进行建模，从而显着改善场景的逼真的外观。 UNIGINE也是如此。本节列出了Unity GI技术以及在UNIGINE中获得相同或相似结果的方法。

Lightmaps光照贴图#

Light ProbeLight Probe#

Reflection ProbeReflection Probe#

An almost complete counterpart for Unity Reflection Probe is Environment Probe. These reflection providers store a cubemap texture to be rendered on reflective surfaces.Unity Reflection Probe的一个几乎完整的副本是Environment Probe。这些反射提供程序存储要在反射表面上渲染的立方体贴图纹理。

Reflective sphere placed inside Environment Probe放置在Environment Probe内的反射球

The Static, Realtime and Custom modes are also available for Environment Probe:静态，实时和自定义模式也可用于Environment Probe：

Realtime Mode. The cubemap is grabbed each frame providing real time reflections and a massive load on the CPU.实时模式。每帧都将抓取立方体贴图，以提供实时反射并给CPU带来沉重的负担。

Static Mode. Environment Probe uses a pre-baked cubemap obtained using the Bake Lighting tool. This mode suits mostly static environments.静态模式。 Environment Probe使用通过Bake Lighting工具获得的预烘焙立方体贴图。此模式主要适合静态环境。

Custom Mode. The static mode with a custom cubemap texture assigned.自定义模式。分配了自定义立方体贴图纹理的静态模式。

Box projection is supported as well:箱体投影也受支持：

Projection types shown on a box-shaped room箱形房间中显示的投影类型

Furthermore, spherical Environment Probe can be subject to the Parallax effect controlled by the corresponding parameter. While the 0 value implies projecting the reflection on an infinitesimally far sphere, the value of 1 corresponds to the actual Probe's bounding sphere taking into account the viewer's perspective.此外，球面Environment Probe可能会受到由对应参数。虽然0值意味着将反射投影在一个无限远的球体上，但考虑到观察者的视角，1的值对应于实际Probe的边界球。

Planar ReflectionPlanar Reflection#

Lately Planar Reflection Probes were added as a part of Unity High Definition Render Pipeline (HDRP). This component is responsible for providing dynamic planar reflections and shares many properties with the conventional Reflection Probe.最近添加了Planar Reflection Probes作为Unity高清晰度渲染管线（HDRP）的一部分。该组件负责提供动态平面反射，并与常规Reflection Probe具有许多属性。

In UNIGINE, planar reflections are implemented as Planar Reflection Probe too.在UNIGINE中，平面反射也实现为Planar Reflection Probe。

Baked Ambient Occlusion烘烤环境阻塞#

In Unity software, Audio Source components play back Audio Clip assets. There must be an Audio Listener component, usually attached to the main camera by default, to make the sounds audible. The Spatial Blend parameter of the Audio Source component allows controlling the blending between 2D and 3D spatial sound.在Unity软件中，Audio Source组件将播放Audio Clip资产。必须有一个Audio Listener组件，通常默认情况下将其附加到主摄像头，以使声音可听。 Audio Source组件的Spatial Blend参数允许控制2D和3D空间声音之间的混合。

In UNIGINE, Sound Source node type is responsible for playing back an audio asset. It provides a surround effect the same way as it does Unity software. There is no such entity as the Unity Audio Listener — all sound sources that appear in the world are audible. While many parameters seem rather familiar to you, such settings as Doppler level, Attenuation (Rolloff) function and other, including Audio Mixer channels, are available only globally in the Sound section of the Settings window.在UNIGINE中，Sound Source节点类型负责播放音频资产。它提供与Unity软件相同的环绕效果。没有Unity Audio Listener这样的实体-世界上出现的所有声源都是可听见的。尽管您似乎很熟悉许多参数，但Doppler level，Attenuation（滚动）功能等设置以及包括Audio Mixer通道在内的其他设置仅在Settings窗口的Sound部分中全局可用。

注意

Note that a sound source must use a mono audio file to be spatialized at run time. Stereo audio files are played according to the stereo channels stored.请注意，声源必须使用单声道音频文件在运行时进行空间化。立体声音频文件根据存储的立体声通道播放。

UNIGINE supports HRTF (Head Related Transfer Function) out of the box, so imitation of surround sound for stereo headsets is close to real life.UNIGINE开箱即用地支持HRTF (Head Related Transfer Function)，因此，模拟立体声耳机的环绕声接近现实生活。

Another sound source entity in UNIGINE is Ambient Source used to create a non-directional ambient background sound (e.g. background music). It has no position in the world and, therefore, can't be represented as a node. So it is available only via API.UNIGINE中的另一个声源实体是Ambient Source，用于创建非定向的环境背景声音（例如背景音乐）。它在世界上没有位置，因此不能表示为节点。因此，仅可通过API使用。

Just like Reverb Zone in Unity software, UNIGINE's Sound Reverb nodes represent reverberation zones where ambient sound effect appears provided the player is within the zone. With fine-tuned parameters a reverberation zone correctly reproduces the way the sound is reflected from surfaces, forming three main components:就像Unity软件中的Reverb Zone一样，UNIGINE的Sound Reverb节点表示混响区域，只要播放器在该区域内，环境声音效果就会出现在该区域。通过微调的参数，混响区可以正确再现声音从表面反射的方式，从而形成三个主要成分：

• Early reflections早期反思
• Late reverberation后期混响
• Echo回声

Besides that, a number of parameters can be changed to alter the type of environment being simulated. A number of presets may help you to quickly choose the most suitable type of environment to simulate:除此之外，可以更改许多参数以更改要模拟的环境的类型。许多预设可以帮助您快速选择最合适的环境类型来模拟：

By adjusting the Threshold parameter you can enable smooth sound transition when the listener moves from the outside area into the reverberation zone.通过调整Threshold参数，可以在聆听者从外部区域移至混响区域时实现平稳的声音过渡。

Unity software provides an advanced Video Player component capable of rendering videoclips of various formats to textures and other targets.Unity软件提供了高级的Video Player组件，该组件能够将各种格式的视频剪辑渲染到纹理和其他目标。

In UNIGINE, video playback is supported only in a virtual monitor as a part of GUI system. Currently only *.OGV files are supported.在UNIGINE中，仅在虚拟监视器作为GUI系统的一部分。当前仅支持*.OGV文件。

Unity software provides mipmap-based Texture Streaming. This system reduces the total amount of memory Unity software needs for textures by loading only the mipmaps that are needed to render the current camera position in the scene.Unity软件提供了基于mipmap的纹理流。该系统通过仅加载渲染场景中当前相机位置所需的mipmap，减少了Unity软件对纹理的内存需求。

The Texture Streaming settings are provided in Unity Quality Settings.Unity质量设置中提供了纹理流设置。

In UNIGINE, textures streaming is a part of the advanced Asynchronous Data Streaming system. This system is intended to reduce spikes caused by loading of graphic resources, such as meshes and textures. Only the resources that are required to render the current camera view are loaded; and unloaded as soon as other resources require to be loaded to video memory in order not to exceed the specified memory limits. Uploading is time-sliced so as to avoid spikes when the world is just loaded.在UNIGINE中，纹理流是高级功能的一部分异步数据流系统。该系统旨在减少由于加载诸如网格和纹理之类的图形资源而导致的尖峰。仅加载呈现当前摄影机视图所需的资源；并在需要将其他资源加载到视频内存时立即卸载，以免超出指定的内存限制。上传是按时间分割的，以避免在加载世界时出现峰值。

Settings for fine adjustment are available in the Streaming section of the Settings window:在Settings窗口的Streaming部分中提供了用于微调的设置：

Asynchronous Texture Upload异步纹理上传#

In Unity Editor you can bake static GameObject with the Static Occluder flag enabled into View Volumes for Occlusion Culling to define the geometry that will block the GameObjects with the Static Occludee enabled from rendering. This technique extremely reduces the number of polygons rendered.在Unity Editor中，可以将启用了Static Occluder标志的静态GameObject烘焙到“遮挡剔除的视图体积”中，以定义将阻止启用了Static Occludee的游戏对象渲染的几何图形。该技术极大地减少了渲染多边形的数量。

Also, it is normal for you, as a Unity user, to define View Volumes using Occlusion Areas and use Occlusion Portals to represent GameObjects that can be both open and closed in terms of blocking the sight, such as doors.另外，作为Unity用户，使用Occlusion Areas定义视图体积并使用Occlusion Portals表示可以阻挡视线的打开和关闭的游戏对象（例如门），对于您来说是正常的。

In UNIGINE, Occlusion Culling technique is represented by two methods:在UNIGINE中，咬合剔除技术由两种方法表示：

• Occluder. Use box-shaped and mesh-based objects culling geometry occluded by them.Occluder。使用箱形和基于网格的对象剔除它们所遮挡的几何形状。

  

• Hardware Occlusion Queries technique allows skipping rendering of objects, the bounding boxes of which are covered by another opaque geometry.硬件遮挡查询这项技术可以跳过对象的渲染，而对象的边界框被另一种不透明的几何形状覆盖。

  

Draw call batching in Unity software is a way to reduce the number of draw calls by combining static GameObjects sharing the same material into big meshes. In order to take advantage of static batching, one needs to enable the Batching Static flag of GameObject:Unity软件中的绘制调用批处理是一种通过将共享相同材质的静态GameObjects组合到大网格中来减少绘制调用次数的方法。为了利用静态批处理，需要启用GameObject的Batching Static标志：

As well as Unity software, UNIGINE performs Draw call batching: all opaque surfaces are automatically grouped and rendered in batches according to materials assigned, thus decreasing the number of DIP calls and, therefore, increasing the performance. This is why sometimes it is reasonable to create Texture Atlases, so even objects using different textures could share the same material in order to be subject to batching.除Unity软件外，UNIGINE还执行Draw调用批处理：所有不透明的曲面都根据分配的材料自动分组并成批渲染，从而减少了DIP调用的次数，因此提高了性能。这就是为什么有时创建“纹理地图集”是合理的，因此，即使使用不同纹理的对象也可以共享相同的材质，以便进行批处理。

UNIGINE provides additional objects to take full advantage of mesh batching:UNIGINE提供了其他对象以充分利用网格划分的优势：

• 

  Mesh Clutter is an object used to scatter a large number of identical meshes across the world. It is suitable for simulating vegetation a lot while keeping performance high.Mesh Clutter is an object used to scatter a large number of identical meshes across the world. It is suitable for simulating vegetation a lot while keeping performance high.

  

  Mesh Clutter is an object used to scatter a large number of identical meshes across the world. It is suitable for simulating vegetation a lot while keeping performance high.

  Mesh Clutter is an object used to scatter a large number of identical meshes across the world. It is suitable for simulating vegetation a lot while keeping performance high.Mesh Clutter是一个对象，用于在世界范围内散布大量相同的网格。它适用于大量模拟植被，同时又保持较高的性能。

  

• Mesh Cluster is an object that can contain a great number of identical meshes with the same material, which are managed as one object. Cluster meshes can be scattered either automatically, or each mesh can be positioned, rotated, and scaled manually.Mesh Cluster是一个对象，可以包含大量具有相同材质的相同网格，将它们作为一个对象进行管理。群集网格可以自动分散，也可以手动定位，旋转和缩放每个网格。

  

Follow the Working with Large Number of Objects article for more details on using these objects.跟着处理大量对象文章以获取有关使用这些对象的更多详细信息。

In Unity software, you use Billboard Asset — a collection of pre-rendered images of a more complicated Mesh intended for use with the Billboard Renderer component — to replace the complex 3D mesh with a 2D billboard representation at some distance from the camera, thus reducing the load on GPU.在Unity软件中，您使用Billboard Asset（旨在与Billboard Renderer组件一起使用的更复杂的Mesh的预渲染图像的集合）将复杂的3D网格替换为距相机一定距离的2D广告牌表示，从而减轻了负担在GPU上。

The most common way to generate Billboard Asset is to use a third-party software or create Billboard Asset from script.生成Billboard Asset的最常见方法是使用第三方软件或从脚本创建Billboard Asset。

UNIGINE provides support for Billboards as well. In UNIGINE, a Billboard is a rectangular flat object that always faces the camera so it is capable of representing some flat effects and objects that are barely seen from far off.UNIGINE也提供对Billboards的支持。在UNIGINE中，Billboard是始终面向相机的矩形平面对象，因此它能够表示一些平面效果和从远处几乎看不到的对象。

You can generate a billboard-based Impostor using the Impostors Creator. This out-of-the-box tool creates a series of snapshots of the object while saving shading fidelity and combines them in a single Billboard object. Now you can use the impostor object as the lowest LOD for the mesh at a distance.你可以生成基于广告牌的Impostor使用Impostors Creator。这个开箱即用的工具创建了对象的一系列快照，同时保存了阴影保真度，并将它们组合在单个Billboard对象中。现在，您可以将冒名顶替对象用作远距离网格的最低LOD。

Impostor albedo texture冒名顶替者反照率纹理	Object and Impostor wireframes对象和Impostor线框