BLACKBODY EMISSION

In order to understand Blackbody Emission, first we need to explain the natural phenomenon called "black body radiator". A "black body" is an electromagnetism that is released due to the temperature of the body. Each object emits electromagnetic radiation of certain frequency depending on its energy. The lowest temperature that can be present in the universe is 0 Kelvin (-273.15 Celcius).

All objects radiates warmer than 0 Kelvin. However, since the radiation is not in visible wavelength, we can not see those. As the temperature increases, it begins to emit visible light. It is a good example of the reddish black body composition that is emitted from the spaces between burning hot charcoal pieces. The color of the light depends on the temperature of the coal parts. Even you'll emit a black body, but not visible with naked eyes because it is not in the "visible wavelength".However you can be seen with thermal equipment as a blackbody radiator (as you see in Hollywood movies).

This natural phenomenon is simply formulated in the name of "Blackbody Emission" in Octane. This feature works in regular lights (Area, Targeted Area, IES light), and it is also possible to turn any object in your scene into a light source. From here you can set the temperature of the Kelvin by entering the temperature values (change in the color of visible wavelengths as the temperature increases or decreases). What matters here is not the object shape on scene, but the emission. In the example below, the light you see on the left is the Octane's default "Area light". The other three are the classic Cinema 4D objects. However, when we define "Blackbody Emission" for these objects, they will be "blackbody radiator" and begins to emit light like the default Octane Area Light. These objects are called "Mesh Emitters" in Terminology. Octane Area Light also uses Blackbody Emission by default and is written to create light in a practical way. That's how the Emission feature works in Octane.

黑体发光

为了理解黑体发光，首先我们需要解释一种称为“黑体散热器”的自然现象。 “黑体”是由于物体的温度而释放的电磁。每个物体都会根据其能量发出一定频率的电磁辐射。宇宙中可能存在的最低温度是0开尔文（-273.15摄氏度）。所有物体的辐射温度均高于0开尔文。但是，由于辐射不在可见波长范围内，因此我们看不到那些。随着温度升高，它开始发出可见光。这是从燃烧的热木炭块之间的空间散发出的红色黑色体成分的一个很好的例子。灯的颜色取决于煤部分的温度。即使您将发射出一个黑色的身体，但由于它不在“可见波长”内，因此用肉眼看不到。但是，您可以将加热设备看作是一个黑色的身体辐射体（就像在好莱坞电影中看到的那样）。

这种自然现象可以用Octane中的“黑体发光”的名字简单地表述。此功能可在常规光源（区域，目标区域，IES光源）下工作，并且还可以将场景中的任何对象转换为光源。在这里，您可以通过输入温度值（随着温度升高或降低，可见波长的颜色变化）来设置开氏温度。这里重要的不是场景上的物体形状，而是发射。在下面的示例中，您在左侧看到的光是Octane的默认“区域光”。其他三个是经典的Cinema 4D对象。但是，当我们为这些对象定义“黑体辐射”时，它们将成为“黑体辐射器”，并开始像默认的“Octane区域光”一样发光。这些对象在术语中称为“网格发射器”。默认情况下，Octane Area Light还使用“黑体发光”（Blackbody Emission），并且被编写为以实用方式创建光。这就是“排放”功能在Octane中的工作方式。

How to setup a Blackbody Emission to any object

First create any object you want to be light, for example a disc object. You can set the disk object to the size you want. Then create a Diffuse material and assign this material to the Disc object. Now open the Node editor and drag and drop the Diffuse material you created in the Node editor. Then select "Blackbody Emission" from the "Texture Nodes" menu on the left side of the Node editor and connect it to the "Emission" slot of the diffuse material (setup shown below). That's it. By selecting the blackbody emission node, you can adjust your light settings in the settings window that appears on the right. These light settings are the global settings of the blackbody emission. In the "Octane Light Tag" section we will describe these settings in detail. As you can see, setup is quite simple and you can use it to make "Mesh Emitter" easily.

如何为任何物体设置黑体发光

首先创建您想点亮的任何对象，例如光盘对象。 您可以将磁盘对象设置为所需的大小。 然后创建一个漫反射材质，并将该材质分配给Disc对象。 现在打开“节点”编辑器，然后拖放在“节点”编辑器中创建的“漫反射”材质。 然后从“节点”编辑器左侧的“纹理节点”菜单中选择“黑体发光”，并将其连接到漫反射材质的“发射”插槽（如下所示的设置）。 而已。 通过选择黑体发光节点，您可以在右侧显示的设置窗口中调整灯光设置。 这些光设置是黑体发光的全局设置。 在“Octane灯光标签”部分中，我们将详细介绍这些设置。 如您所见，设置非常简单，您可以使用它轻松制作“ Mesh Emitter”。