octane IES lIght
Let's say you designed a room or a house. You want to get a realistic render output. Is it better to do the lighting according to your guess, or does it make sense to do it according to the actual light data? If your answer is the second one, you can continue reading this section. IES is simply a type of data stored the light distribution. To put it in more detail, hundreds of different types of light sources that we can use today to illuminate are produced by various manufacturers. The light and the light distribution of these light sources are different in every brand and model light. When you use different light bulb, you will see a different distribution. This led to a data type called the IES (short for Illuminating Engineering Society) where the light distribution is stored. Manufacturers of lighting systems provide this data for free so you can see the results of their lights.
With Octane you can achieve realistic light distribution using these IES data. To use IES, first go to the "Object" menu from Live Viewer and select "IES Light" from the Lights Drop down menu. The scene will have a classic Area Light. However, if you click on Octane Light Tag in Object Manager, you will see that Octane image texture is automatically assigned to the Distribution section. You need to define an IES file for this image texture. There is a lot of resources on the Web for this. Or if you search for "IES" in Cinema 4D Content Browser, you will get a lot of IES files. You can use the appropriate one from these. You'll also see that Projection is in Sphere mode and rotation is 90 degrees. All of these options are automatically created when you create an IES light from LV.
The following "Quick Sheet" simply describes the IES Light creation process. You can create IES light by following the steps. After creating your light, you may need to play with both power and IES light data power and gamma. Make light settings according to the scene.
As an important note, you can apply IES light to all objects, but it is important that the size of the object should be small (IES lights are usually small). So you get the most accurate result physically. In addition, brightness settings are written to the IES file by default. Do not use IES light "power" as much as possible unless you have to.