Create or obtain images for custom environments

Environments are created using High Dynamic Range (sometimes called 32-bit or HDR) panoramic images. They store more brightness than can be displayed on a conventional computer monitor. They can be created by many different devices, cameras, and software with a wide range of capabilities. The quality of the HDR input image greatly influences the quality of the custom environment in Showcase.

You can create your own environment from an HDR image. From the HDR image, create lighting maps, which add lighting to materials and provide specular and diffuse highlights and reflections.

The source panorama image used to create the IBL Lighting maps must be an HDR image that shows 360 degrees of a scene around a central point, and 180 degrees vertically (from straight up to straight down). Showcase supports Latitude/Longitude ("Latlong") HDRs. These are similar to a world map, with the poles at the top and bottom edges.

The aspect ratio (length/height) of the Latlong image is 2:1, and pixel values should be powers of 2; for example 1024/512, 2048/1024, and so on. To achieve the optimum resolution in the viewport, use Latlong HDRs whose dimensions are 4096/2048 pixels.

Alternatively, instead of starting with an HDR image, you can take an existing environment and add a different backdrop or infinite environment, depending on the type of environment you are creating.

• A backdrop is a panoramic image of the environment (typically derived from the same file as the lighting maps, but not HDR) which is mapped to the visible environment geometry. The panoramic backdrop image must be in a latitude/longitude (equi-rectangular "map") format and have an aspect ratio of 2:1. Ideally, it should be at resolution 4096 x 2048.
• A scale-independent image is a regular 2D image, typically showing the location where the lighting maps are centered. The objects in your scene can then be viewed against the image with matching reflections and lighting.