原文链接：http://www.3dtotal.com/team/Tutorials_3/using_hdri/using_hdri_01.htm

For most of my rendering work, I use 3ds max 8 and V-Ray 1.5. Although Mental Ray, Brazil, and finalRender all support rendering with HDRIs, I have found V-Ray to be the most intuitive and manageable. However, I will be writing tutorials in the future regarding the use of HDRIs with all the major rendering engines.
（在我的大部分渲染工作中，我使用3dsmax8和Vray1.5。尽管Mental Ray，Brazil和finalRender都支持HDRIs，但我觉得vray是最直观，最易管理的。但是，我将在不久后考虑编写在所有主流渲染引擎中HDRIs的使用教程。）

So let’s get started. First, create or import the model that you would like to render. In our case we went to www.turbosquid.com and downloaded a free model of an F-5E Tiger II (a model from the www.meshfactory.com collection - a great resource). The next thing we need to do is create an invisible ground plane onto which our object's shadows can be cast, and from which our object can receive additional reflected light. The "VRayPlane" is the perfect primitive for this job. It will stretch to infinity when rendered, while only taking up a small amount of space in the viewport.
(让我们开始吧。首先，创建或导入一个你准渲染的模型。就我而言，我到www.turbosquid.com 下载了一个免费的　Ｆ－５Ｅ虎Ⅱ型战斗机的模型（一个来自www.meshfactory.com 集合的模型）。下一步我们要做的是创建一个不可见的地面以接受物体投射的阴影，我们的物体也能因此接受来自地面的反光。“vrayplane”是充当这一角色的绝佳人选。渲染时它会无限延伸，但在视窗里只占一小块空间。）

（在创建面板的几何体栏，从下拉菜单选择vray。选中名为VrayPlane的物体类型。在靠近视窗原点的地方单击，你将看到一个小的方形平面。这个可见物体实际上代表着在所有方向都无限延伸的一个平面。这个平面随着你缩放视图而变化，并一直保持着相同的大小。右击VrayPlane,选择Vray属性。为了让它按我们想的那样发挥作用，我们需要修改一些设定。）

Next, we need to go to the Render Scene dialog and make sure that the VRay renderer is selected under the Assign Renderer rollout. Then, under the Renderer tab in the Global Switches section, turn off "Default Lights". Then, change the GI settings as follows:
（下一步，我们需要进入渲染场景对话框，确保在指定渲染器一栏选择使用的是vray渲染器。然后在渲染面板的全局控制一项中，关闭“Default Lights（默认灯光）”。然后，按下图更改ＧＩ设置。）

（为了测试渲染，我们将采用光子贴图的中等预设值，HSph. 细分为20。这里的关键是确保你打开了ＧＩ，否则，HDRI无法提供灯光照明。）

Now that the scene is prepared and the basic lighting parameters are set, we will finally start to work the the HDR image. The first thing we need to do is assign our HDRI to the GI Environment and Reflection/Refraction Environment Override slots:
（现在，场景已经准备好了，基本的灯光属性也设置好了，我们终于要开始对HDRI图像进行工作了。首先要做的是将我们的HDRI指定到GI环境和反射折射环境的样本槽中：）

Turn on both the GI Environment override, and the Reflection/refraction Environment override. Click on None in the map slot for the GI Environment and select VRayHDRI as the map type. Drag an instance of this map to the Reflection/refraction map slot beneath it. Now, in order for us to be able to manipulate this map, we will need an instance of it in the Material Editor. Drag from one of these two map slots to an empty material slot in the material editor. Click on the Browse button for your new map, and navigate to the HDR image that you would like to use. Now you will see a thumbnail of your HDRI map, as well as a number of new parameters to work with.
（打开GI环境控制和反射折射环境控制。单击GI环境右侧的NONE 贴图样本槽，然后选择VrayHDRI贴图类型。将这个贴图拖动关联复制到下面的反射折射贴图样本槽。现在，为了能操控这个贴图，我们需要它在材质编辑器中的一个实例。拖动这两个贴图样本槽中的一个到材质编辑器里的空材质球上。点击你新贴图上的浏览按钮，找到你要使用的HDRI图像。现在你将看到你HDRI贴图的一个缩略图，以及一些新的属性。

If you do another render, you will see that the lighting on your model very closely matches the lighting of your background environment. You may find that your model appears to be unnaturally placed, such as having a car sitting in a treetop. You will need to rotate, pan, and tilt your camera around your model to get a good match between your background map and your model. The easiest way to do this is to go to the Views menu and select Viewport Background.
（如果你再次渲染的话，你会发现模型上的照明跟背景环境的光线非常接近。你也许会发现你的模型显得有些不自然，像一辆小汽车停在树梢。你需要旋转，移动，倾斜你的摄像机，以便让你的模型更好的匹配背景图像。简单的方法是进入视窗菜单，然后选择视窗背景。）



Using the settings above, the background of your perspective viewport will show the ldr environment map. In this way, you will be able to see your models relationship to the background in real time, and adjust camera position accordingly.  
（使用上图的设置，透视图中的背景将显示环境图片。用这种方法，你可以实时看见你的模型跟背景之间的关系，并据此调整摄像机的位置。）

Thank you.
（如果你希望添加这篇教程到你的网站中，请给我适当的报酬，并链接到hdrmill.com，谢谢。）

The Staff at HDR Mill.