入门

When you create an application in UNIGINE, it is represented by a project. A project is a "container" for the application's code, content, and meta-data.在UNIGINE中创建应用程序时，它由项目表示。 项目是应用程序的代码，内容和元数据的“容器”。

A project can consist of one or several complex 3D scenes, which are called worlds.一个项目可以包含一个或几个复杂的3D场景，这些场景称为 worlds 。

All projects are managed via the UNIGINE SDK browser.所有项目都通过 UNIGINE SDK浏览器进行管理。

A UNIGINE-based virtual world is a 3D scene that contains a set of different scene graph nodes (e.g. static meshes, lights, cameras, etc.) placed into specified positions, and global settings (rendering, physics, etc.) applied to the whole scene.基于UNIGINE的虚拟 世界 是3D场景，其中包含一组不同的场景图 节点 （例如静态网格物体，灯光，照相机等）放置到指定位置，并应用全局设置（渲染，物理等）整个场景。

A scene graph in UNIGINE is a multi-root tree (hierarchy) of nodes. UNIGINE中的场景图是节点的多根树（层次结构）。

Each world is represented by an XML file with the .world extension.每个世界都由一个扩展名为.world的XML文件表示。

When you create a new project via the SDK Browser, a new world is also created with the same name as your project.通过SDK浏览器创建新的项目时，还会创建一个与您的项目同名的新世界。

To edit your existing worlds and create new ones, use UnigineEditor. You can create and use as many worlds as you need.要编辑现有世界并创建新世界，请使用 UnigineEditor 。您可以根据需要创建和使用任意多个世界。

A world with nodes in it viewed in UnigineEditor在UnigineEditor中查看了带有节点的世界

In terms of UNIGINE, all objects added to the scene are called nodes. Nodes can be of different types, determining their visual representation and behavior.就UNIGINE而言，添加到场景中的所有对象都称为节点。节点可以是不同类型，可以确定其视觉表示和行为。

There is a rich set of built-in node types. Though the set covers almost all of required cases, it can be manually extended by the user.有一组丰富的内置节点类型。尽管该集合涵盖了几乎所有必需的情况，但用户可以手动对其进行扩展。

You can also extend basic functionality of any node by adding components to it.您还可以通过向其添加 components 来扩展任何节点的基本功能。

Every node has a transformation matrix, which encodes position, rotation, and scale of the node in the world.每个节点都有一个变换矩阵，该矩阵对世界上该节点的位置，旋转和比例进行编码。

There are node types that appear visually: Objects, Decals, and Effects. Other node types (Light Sources, Players, etc.) are invisible.有一些直观显示的节点类型：对象，贴图和效果。其他节点类型（光源，播放器等）是不可见的。

Node parameters are regularly stored in the .world file, but also can be saved into a separate XML file with the .node extension (and later be referenced from the .world file via the special nodes called Node References, which is used for node instancing).节点参数通常存储在.world文件中，但也可以保存到扩展名为.node的单独XML文件中（以后可以通过称为.world file via the special nodes called Node References, which is used for node instancing）。

Object

目的#

A mesh is a collection of polygons defining object's geometry. It has the following properties: 网格是定义对象几何形状的多边形的集合。它具有以下属性：

• Each mesh has one or several surfaces.每个网格具有一个或多个曲面。
• Maximum number of polygons per surface is 2,147,483,647 (ObjectMeshStatic, ObjectMeshSkinned) or 65,535 (ObjectMeshDynamic).每个表面的最大多边形数量为 2,147,483,647 （ObjectMeshStatic，ObjectMeshSkinned）或 65,535 （ObjectMeshDynamic）。
• There are 2 UV channels for texturing.有2个UV纹理通道。
• Mesh supports vertex colors.网格支持顶点颜色。

Animation in UNIGINE can be performed by skinned meshes (bone-based), morph targets (keyframe) or dynamic meshes (code-controlled). UNIGINE中的动画可以通过皮肤网格物体（基于骨骼），变形目标（关键帧）或动态网格物体（代码为

At run time, meshes are stored in proprietary UNIGINE formats with .mesh (static mesh + optional animation data) and .anim (external animation data) extensions.在运行时，网格以专有的UNIGINE 格式存储，扩展名为.mesh（静态网格+可选动画数据）和.anim（外部动画数据）。

When importing an FBX model to the Engine, it is automatically converted to the .mesh format. 将FBX模型导入到引擎时，它会自动转换为.mesh格式。

注意

If you want parts of your object to have different materials (e.g. transparent / opaque, shiny metal / human skin), you should split your mesh into surfaces. However, if you want parts of your geometry to move separately (e.g. spinning wheels of a car), you would need several separate meshes.如果希望对象的各个部分具有不同的材质（例如，透明/不透明，有光泽的金属/人体皮肤），则应将网格划分为多个表面。但是，如果要使几何图形的各个部分分开运动（例如汽车的旋转车轮），则需要几个单独的网格。

A surface is a named non-overlapping subset of the object geometry (i.e. object mesh). Each surface can have its own material or property assigned. It is also possible to enable/disable surfaces independently from each other. 表面是对象几何体（即对象网格）的命名的不重叠子集。每个表面可以分配自己的材质或属性。也可以彼此独立地启用/禁用表面。

Surfaces can be organized in a hierarchy within a mesh (it can be used for LOD switching).可以在网格中的层次结构中组织表面（可用于 LOD 切换）。

At the picture below, a soldier 3D mesh consists of 4 surfaces: eyes, skin, bags (body armor, radio set, bag), and body (overalls, shoes, hard hat, gloves).在下面的图片中，一个士兵3D网格由4个表面组成：眼睛，皮肤，包（防弹衣，收音机，包）和身体（工作服，鞋子，安全帽，手套）。

In terms of UNIGINE, a material is a rule defining how the surface will look like: its interaction with lights, reflection parameters, etc. It is based on:就UNIGINE而言， 材质 是一个规则，用于定义表面的外观：其与灯光，反射参数等的交互。它基于：

• Vertex, fragment and geometry shaders that actually draw the material based on different conditions.顶点，片段和几何形状着色器，它们根据不同的条件实际绘制材质。
• User-defined textures passed to shaders.用户定义的纹理传递给着色器。
• States that specify conditions, based on which the appropriate shaders will be applied. 状态，用于指定条件，并根据这些条件应用适当的着色器。
• Parameters defining how shaders will be used. 参数，用于定义如何使用着色器。

UNIGINE提供了一组丰富的 内置基础材质 。推荐的方法是从基础材质继承并调整新的用户材质。您还可以使用UUSL（Unified UNIGINE Shader Language）或HLSL 创建自定义着色器，但在后一种情况下，您需要自己随每个SDK版本一起迁移自定义着色器。

除了在某些表面上应用常规材质外，还有一种特殊类型的材质称为 后期材质 ，它们会应用到最终屏幕组成之上（例如夜间或热视觉效果）。您还可以使用自定义后期材质和自定义着色器创建自己的后效果。

Material Hierarchy

物质层次#

A property is a "material" for application logic. It specifies the way the object will behave and interact with other objects and the scene environment. Properties can have parameters of various types — from a simple integer representing your character's hit points, to node, material, file (for textures, meshes, sounds, etc.), or property, which simplifies access to various resources. 属性 是应用程序逻辑的“材质”。它指定对象的行为方式以及与其他对象和场景环境交互的方式。属性可以具有各种类型的参数-从代表角色命中点的简单 integer 到节点，材质，文件（用于纹理，网格，声音等），或属性，可简化对各种资源的访问。

Properties can be used to build components to extend the functionality of nodes.属性可用于构建 组件 以扩展节点的功能。

Properties, like materials, are organized in a hierarchy with parameter inheritance. But, unlike materials, they can be applied either per-surface or per-node. 属性（如材质）在具有参数继承的层次结构中进行组织。但是，与材质不同，它们可以每个表面或每个节点应用。

UnigineEditor allows you to assemble a virtual world: import and set nodes, assign materials and properties to them, setup lighting, adjust global settings (physics, rendering, etc.) and more. It features What You See Is What You Get approach: you can instantly see the scene with final quality (as at run time). UnigineEditor 允许您组装虚拟世界：导入和设置节点，为其分配材质和属性，设置照明，调整全局设置（物理，渲染等）等等。它具有所见即所得方法：您可以立即以最终质量（在运行时）看到场景。

Watch the tutorial below to learn how to import 3D models to UNIGINE:观看以下教程，了解如何将3D模型导入UNIGINE：

Lighting in your worlds is created by placing Light Sources. These nodes contain parameters, which determine various light characteristics, such as brightness, color, etc. You can also use physically-based parameters, like color temperature and illuminance, to set up your lights.您的世界中的灯光是通过放置光源创建的。这些节点包含确定各种灯光特征（例如亮度，颜色等）的参数。您还可以使用基于物理的参数（例如色温和照度）来设置灯光。

There are different kinds of lights and they emit light in different ways. A light bulb, for example, emits light in all directions — in UNIGINE it is represented by the omni light. A projector or car headlights emit a cone of light in a certain direction — projected light. Light beams that come from the sun appear to be parallel, as their source is located so far away. To simulate this type of lighting in UNIGINE, the world light is used.有不同种类的灯，它们以不同的方式发光。例如，灯泡向各个方向发光-在UNIGINE中，它由 全方位照明 表示。投影仪或汽车前灯在特定方向上发出锥形光束- 投射光 。来自太阳的光束看起来是平行的，因为它们的光源太远了。为了在UNIGINE中模拟这种类型的照明，使用了 世界照明 。

To learn more about lighting in UNIGINE, see the Lighting Video Tutorial.要了解有关UNIGINE中照明的更多信息，请参见 Lighting Video Tutorial 。

UNIGINE has a combination of full deferred renderer with forward rendering techniques: UNIGINE结合了完整的延迟渲染器和正向渲染技术：

• All opaque (non-transparent) geometry is rendered in the deferred pass.所有不透明（非透明）几何图形均以递延遍历呈现。
• Transparent geometry is rendered in the forward pass.透明几何体在前进通道中呈现。

To learn more about the applied rendering techniques, see the Rendering Sequence article.要了解有关应用的渲染技术的更多信息，请参见 Rendering Sequence 文章。

In UnigineEditor all rendering settings (such as global illumination, shadows, environment, anti-aliasing, post-effects, etc.) can be adjusted via the Rendering Settings section and saved to a *.render file to be used later. Each new project contains settings for low, medium, high, and ultra quality presets as well as settings optimized for best performance in VR. You can now simply double-click on any of them in the Asset Browser to apply corresponding settings.在 UnigineEditor 中，可以通过 Rendering Settings 部分，并保存到*.render文件中以备后用。每个新项目都包含低，中，高和超质量预设的设置，以及为实现VR最佳性能而优化的设置。现在，您只需在资源浏览器中双击其中的任何一个即可应用相应的设置。

To assign some physical properties to an object, so that it could participate in interactions between objects or external physical forces, it should have a body. There are several types of bodies: Rigid, Rag Doll, Fracture, Rope, Cloth, Water, Path.要为对象分配一些物理属性，使其可以参与对象之间的相互作用或外部物理力，它应具有 body 。主体有几种类型：Rigid, Rag Doll, Fracture, Rope, Cloth, Water, Path。

Almost like in the real world, virtual physics of the body follows the concepts of velocity, force, mass, density and so on.几乎像在现实世界中一样，人体的虚拟物理学遵循速度，力，质量，密度等的概念。

While a body simulates various types of physical behavior, a shape represents the volume (sphere, capsule, cylinder, box, convex hull) that a rigid body occupies in space. A physically simulated object usually has a single body and one or several shapes which allow objects to collide with each other.虽然 body 模拟各种类型的物理行为，但形状表示刚性的体积（球体，胶囊，圆柱体，盒子，凸包）身体占据了空间。物理模拟的对象通常具有单个主体和一个或多个形状，这些形状允许对象彼此碰撞。

注意

The maximum number of collision shapes for one body is limited to 32768.一个物理体的最大碰撞形状数限制为 32768。

Collision Detection

碰撞检测#