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It controls the diameter of the backdrop mesh and should be adjusted based on the HDR image used, the horizon height, and the content in the scene. Sets the size (in meters) of the mesh used to project the HDR image. This means that when you swap HDR images, there may be a noticeable difference in brightness changing. It's also worth noting that some HDR images range from 0 to 5.0 or greater than 5 cd/m2 while others are ranging from 0 to 100K units.

However, with the HDRI Backdrop asset, it is not required to use physically correct values, but you may need to set the EV to something significantly lower than the EV100:14. Sun and Sky sources have that range in the thousands of units, which it does hand-in-hand with physical cameras where the Exposure Value (EV) are in the range of EV100:14 (see the 'Sunny 16' rule). Note that the physical lighting units are measured in cd/m2, like the Sky Light or Emissive Materials. It automatically handles the following:īackground mesh (such as a sky dome or custom geometry)Īmbient lighting from a Dynamic Sky Light The HDRI Backdrop Actor enables you to do all of this and more, improving your product visualization workflow. For the result to be plausible, there needs to be a fake ground plane that acts as a shadow catcher to ground the object in the HDR image's environment when being lit, creating consistency between the place object for visualization with the background. However, using an HDR image as a background is not sufficient on its own. It's often desirable to showcase a model in a visually rich context with minimal effort, and using a High Dynamic Range (HDR) image as a backdrop is a common technique to achieve this.The key benefits of using an HDR image as a backdrop for product visualization is that it's relatively quick to set up, it's customizable, and provides beautiful illumination and reflections.

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