从虚幻引擎迁移到UNIGINE：内容创建

In Unreal Editor, you are likely to be used to configuring LODs for a Static Mesh asset using the Static Mesh Editor. You usually import additional FBX files for all LODs and specify the screen size for each one. The active LOD is defined by the threshold based on the ratio of the mesh's screen-space size to the total screen height.在Unreal Editor中，您可能习惯于使用Static Mesh Editor为静态网格物体资产配置LOD。通常，您会为所有LOD导入其他FBX文件，并为每个LOD指定屏幕尺寸。根据网格的屏幕空间大小与总屏幕高度之比，由阈值定义活动LOD。

Configuring LODS in Static Mesh Editor在Static Mesh Editor中配置LODS

In UNIGINE, it is much more handy to store all LODs in a single .fbx model, in this case a Static Mesh created based on the asset will have several surfaces corresponing to LODs. Levels of detail are defined 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，将所有LOD存储在单个.fbx模型中更为方便，在这种情况下，基于资产创建的Static Mesh将具有与LOD对应的多个曲面。细节级别是基于距离定义的-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。

Configuring LODs in UNIGINE在UNIGINE中配置LOD

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 generation of LODs is not provided in UNIGINE, but automatic LODs setup when importing a model is described in the FBX Import Guide. For more details on configuring LODs refer to the dedicated article.在UNIGINE中未提供LOD的自动生成，但是在导入模型时介绍了自动LOD设置。 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。

Animation sequence in UE4 and .anim asset in UNIGINEUNIGINE中的UE4和.anim资产中的动画序列

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，您需要为每个动画导出一个单独的FBX。

Skinned Mesh object acts the same way as Skeletal Mesh Actor in UE4 used for handling bone animations.Skinned Mesh对象的行为与用于处理骨骼动画的UE4中的Skeletal Mesh Actor相同。

There is no skeleton concept as a special type of asset in UNIGINE. The 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.在UNIGINE中，没有skeleton概念是一种特殊的资产。外观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个层，并使用API方法在它们之间执行混合。

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#

UE4 compiles shaders asynchronously using a streaming system.UE4使用流系统异步编译着色器。

In UNIGINE, Forced Shader Compilation, an in-editor feature, is available via both the toolbar and the Editor section of the Settings window.在UNIGINE中，强制着色器编译，一种编辑器内部功能，可通过工具栏和Settings窗口的Editor部分使用。

In UE4, light sources are represented by several Light actors. UNIGINE provides several types of light sources similar to the ones of Unreal Engine. The following table lists all possible way to add lighting in both engines.在UE4中，光源由几个Light actor表示。 UNIGINE提供了几种类型的光源与Unreal Engine类似。下表列出了在两个引擎中添加照明的所有可能方法。

Light Source	Unreal Engine	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 shape区域光：矩形和圆盘形状	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
Flat ambient lighting 平面环境照明	Sky light with a cubemap specified指定了立方体贴图的天光	Environment Ambient Lighting, Environment Probe环境环境照明，Environment Probe

Shadows暗影#

Light Functions灯光功能#

To filter a light's intensity Unreal Engine provides Light Functions.要过滤光的强度，Unreal Engine提供Light Functions。

In UNIGINE, you can use an arbitrary 2D diffuse or albedo texture in the Texture parameter of Light Projected. The same way you can apply texture modulation to a Light Omni by using a cubemap texture.在UNIGINE中，可以在Light Projected的Texture参数中使用任意2D漫反射或反照率纹理。您可以通过使用多维数据集贴图纹理将纹理调制应用于Light Omni的相同方法。

Modulation by texture通过纹理调制

Modulation by cubemap通过立方体贴图进行调制

This is the way IES Light Profiles can be simulated as well.这也是可以模拟IES灯光轮廓的方式。

In UE4, atmospheric lighting is usually represented by a set of actors: SkyLight, SkyAtmosphere, AtmosphericFog, and DirectionalLight.在UE4中，大气照明通常由一组角色表示：SkyLight, SkyAtmosphere, AtmosphericFog和DirectionalLight。

In UNIGINE, all Environment Settings are gathered in the Render Settings (choose Window -> Settings in the main menu, then in the Settings window go to Runtime -> World -> Render -> Environment).在UNIGINE中，所有环境设定在“渲染设置”中收集（在主菜单中选择Window -> Settings，然后在Settings窗口中转到Runtime -> World -> Render -> Environment）。

UNIGINE Environment SettingsUNIGINE环境设置

UNIGINE provides three environment presets, by configuring which you can create a smooth transition between different weather conditions. By default, the first preset is enabled only.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。默认情况下，仅启用第一个预设。

UNIGINE Environment SettingsUNIGINE环境设置

In order to achieve physically correct atmosphere rendering, UNIGINE environment system simulates Scattering by interpolating certain LUTs (Look-UP Textures). This system works in conjunction with the current enabled World light (the Scattering mode), so 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环境系统进行了模拟散射通过内插某些LUT（查找纹理）。该系统与当前启用的“世界”灯光（Scattering模式）配合使用，因此在配置环境照明时，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 for both sky color and reflections.您可以将天空图和反射图都设置为Environment Texture的立方体贴图纹理。

注意

If you need to change reflections locally, for example indoors, use an Environment Probe with a unique cubemap.如果需要在本地（例如在室内）更改反射，请使用具有唯一立方体贴图的Environment Probe。

In UNIGINE, you can use a Sky object recreating clouds and environment background 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云和环境背景。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#

Unreal Engine provides a set of advanced systems that model indirect lighting significantly improving the realistic look of the scene. So does UNIGINE. This section lists UE4 GI techniques and ways to get the same or similar results in UNIGINE.Unreal Engine提供了一组高级系统，这些系统可以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UE4 GI技术和在UNIGINE中获得相同或相似结果的方法。

Lightmaps光照贴图#

UE4 provides the Lightmass system enabling you to pre-calculate (bake) the brightness of surfaces in a scene and store the result in a lightmap for later use at run time. It requires non-overlapping UVs which are auto-generated for static meshes when importing.UE4提供了Lightmass系统，使您能够预先计算（烘焙）场景中曲面的亮度并将结果存储在光照图中，以供以后在运行时使用。它需要不重叠的UV，这些UV会在导入时为静态网格物体自动生成。

Baked indoor GI using Lightmass Portal in UE4使用UE4中的Lightmass Portal烘焙室内GI

In UNIGINE, lightmaps are also supported and baked using the integrated GPU Lightmapper tool.在UNIGINE中，还使用集成的GPU Lightmapper工具支持并烘焙光照贴图。

UNIGINE provides another advanced solution for static GI — Voxel-Based Global Illumination provided by Voxel Probe.UNIGINE为静态GI提供了另一种高级解决方案—由Voxel Probe提供的Voxel-Based Global Illumination。

UNIGINE Voxel-Based Global Illumination基于UNIGINE体素的全局照明

Voxel Probe is a box-shaped volume composed of voxels of fixed size, providing both pre-calculated indirect lighting and diffuse (blurred) reflections. One of advantages of this approach — there is no need in UV coordinates, any geometry will contribute to GI with no issues.Voxel Probe是由固定大小的体素组成的盒形体积，既提供了预先计算的间接照明，又提供了漫反射（模糊） 。这种方法的优点之一-不需要UV坐标，任何几何形状都不会对GI产生影响。

Light baking is performed using Bake Lighting tool.使用Bake Lighting工具执行轻度烘烤。

Similar to using Lightmass Importance Volume in UE4, you can make insets — Voxel Probes with more dense grid — to bake more details of GI where necessary.与在UE4中使用Lightmass Importance Volume相似，您可以使insets（具有更密集网格的Voxel Probes）在必要时烘烤GI的更多细节。

As concerns realtime, Unreal Engine supports SSGI solution providing real-time GI simulation in screen space. For such cases UNIGINE features the SSRTGI (Screen-Space Ray-Traced Global Illumination) technology, which incorporates ray-traced SSGI, SSAO and Bent Normals in screen space, enhancing overall connectedness of the scene a lot.关于实时，Unreal Engine支持SSGI解决方案，可在屏幕空间中提供实时GI模拟。在这种情况下，UNIGINE具有SSRTGI (Screen-Space Ray-Traced Global Illumination)技术，该技术在屏幕空间中加入了光线追踪的SSGI, SSAO and Bent Normals，从而大大增强了场景的整体连接性。

Baked Ambient Occlusion烘烤环境阻塞#

Volumetric Lightmaps体积光照贴图#

Volumetric Lightmap storing precomputed lighing in all points in space is much closer to UNIGINE Voxel Probe.Volumetric Lightmap在空间的所有点中存储预先计算的行距，更接近UNIGINE Voxel Probe。

Volumetric Lightmap in Unreal Editor虚幻编辑器中的体积光照贴图

As Voxel Probe has internal volume baked, it will illuminate objects that move within its bounds. The Bake Internal Volume parameter enables to choose the quality and time required to bake GI for empty voxels (i.e. the voxels that do not cover any geometry).随着Voxel Probe的内部体积被烘焙，它将照亮在其范围内移动的对象。使用Bake Internal Volume参数可以为空的体素（即不覆盖任何几何体的体素）选择烘焙GI所需的质量和时间。

Voxel-based GI on moving objects in UNIGINE基于体素的GI在UNIGINE中移动的物体

To preview ambient lighting in the viewport, switch the Rendering Debug mode to Indirect Lighting.要在视口中预览环境照明，请将Rendering Debug模式切换为Indirect Lighting。

Reflection Capture反射捕捉#

An almost complete counterpart for Sphere Reflection Capture and Box Reflection Capture actors of UE4 is Environment Probe in UNIGINE. This reflection provider stores a cubemap texture to be rendered on reflective surfaces within its bounds. 在UNIGINE中，UE4的Sphere Reflection Capture和Box Reflection Capture actor的几乎完全对应的是Environment Probe。该反射提供程序存储要在其范围内的反射表面上渲染的立方体贴图纹理。

A reflective sphere placed inside Environment Probe放置在Environment Probe内的反射球

Environment Probe can be either Static or Dynamic:Environment Probe可以是Static或Dynamic ：

Dynamic Mode. The cubemap is grabbed each frame providing real time reflections and a massive load on the CPU.Dynamic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.Static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 Static Mode. The static mode with a custom cubemap texture assigned.Custom Static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 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 bounding sphere taking into account the viewer's perspective.此外，球面Environment Probe可以受到视差效果的控制，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的值对应于实际的Probe边界球体。

Planar Reflection平面反射#

The Planar Reflection actor is the provider of real-time planar reflections in Unreal Engine.Planar Reflection actor是Unreal Engine中实时平面反射的提供者。

In UNIGINE, planar reflections are implemented via Planar Reflection Probe.在UNIGINE中，平面反射是通过Planar Reflection Probe实现的。

Screen Space Reflections屏幕空间的思考#

Screen-Space Reflections are also a part of UNIGINE. Global SSR settings contain multiple parameters making fine-tuning available.屏幕空间反射也是UNIGINE的一部分。全局SSR设置包含多个参数，可进行微调。

In UE4, AudioComponent plays back Sound Wave assets. The sound is spatialized using the dedicated flag of AudioComponent.在UE4中，AudioComponent播放Sound Wave资产。使用专用标记AudioComponent对声音进行空间化处理。

In UNIGINE, Sound Source node type is responsible for playing back an audio asset. It provides a surround effect the same way. 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。它以相同的方式提供环绕声效果。尽管您似乎对许多参数相当熟悉，但多普勒电平，衰减（滚降）功能等设置，包括音频混音器通道，仅在Settings窗口的Sound部分中全局可用。

注意

Take 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，声音源必须使用单声道音频文件才能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 the 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 Audio Volume in Unreal Engine, UNIGINE Sound Reverb objects 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Unreal Engine中的Audio Volume一样，UNIGINE Sound Reverb对象表示混响区域，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。

In Unreal Engine, you use Media Framework to play back video files stored in Media Source asset types. Videoclips of various formats can be rendered to textures and other targets.在Unreal Engine中，使用Media Framework播放存储在Media Source资产类型中的视频文件。可以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。

Unreal Engine supports streaming of levels: you can create several maps representing small chunks of a huge world that are streamed when the player approaches to them. The levels to be streamed are listed in Levels window.Unreal Engine支持关卡流式传输：您可以创建多个地图，这些地图代表玩家接近时流式传输的巨大世界的小块。要流式传输的级别在Levels窗口中列出。

In UNIGINE, resources 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，资源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：

UE4 provides mipmap-based Texture Streaming. This system reduces the total amount of memory UE4 needs for textures by loading only the mipmaps that are needed to render the current camera position in the scene.UE4提供基于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，减少了纹理所需的内存总量UE4。

UNIGINE's Asynchronous Data Streaming system uses pre-cached minimized copies of textures — Texture Cache. On world loading the texture cache is loaded first, giving a preliminary content for the scene, whilst full-size textures are being asynchronously loaded.UNIGINE的异步数据流系统使用预先缓存的最小化纹理副本-纹理缓存。在世界上加载时，首先加载纹理缓存，为场景提供初步内容，而异步加载全尺寸纹理。