About working with IBL stages
AEM 3D supports image-based lighting (IBL) for both interactive viewing and rendering with the built-in Adobe Rapid Refine™ renderer and third-party renderers. You can create IBL stages with common authoring tools such as Autodesk® Maya® or Autodesk® 3ds Max®.
Images for IBL
Images used for image-based lighting should have HDR (High Dynamic Range) for best results. They must be in lat/long format with spherical mapping providing full coverage of the environment.
Currently, AEM 3D only supports 32-bit TIFFs. If necessary, use Adobe Photoshop or a similar tool to convert the HDR image to a TIFF using the following settings in the Adobe Photoshop TIFF Export dialog box:
- Bit depth - 32-bit (Float)
- Pixel Order - Interleaved (RGBRGB)
- Image Compression - LZW
- Byte Order - IBM PC
While a single HDR image is often sufficient for IBL stages, AEM 3D provides additional control over IBL effects by allowing up to three separate images:
- Diffuse Lighting Environment Image - This type of image should be an HDR image, but can be relatively small, as the image will be heavily filtered prior to using it for diffuse lighting.
- Reflection Environment Image - This type of image is used to create reflections in object surfaces. It can be a standard 8-bit RGB image of a size and resolution that provides the desired quality and sharpness of reflections. If an HDR image is specified, AEM 3D converts it to 8-bit RGB prior to using a proprietary algorithm.
- Background Environment Image - This type of image is used as a background. It can be a standard 8-bit RGB image and should have a size/resolution/level of detail desired for the stage background. If an HDR image is specified, AEM 3D converts it to 8-bit RGB using a proprietary algorithm.
The conversion algorithm may have difficulty with certain IBL images. This difficulty can result in backgrounds that are too bright or overly saturated in Preview or when rendering with Rapid Refine. In such situations, Adobe recommends that you use Photoshop or a similar tool to manually convert the IBL image to an 8-bit RGB image. Upload this image separately and attach it to the stage as the Background Environment Image. The Diffuse Lighting and Reflection Environment images must always be 32-bit TIFFs.
Adjusting the IBL stage appearance
You can fine-tune the appearance of the IBL stage with the following stage properties:
|IBL Sun Details|
Lets you adjust the direction and strength of the supplemental light source that simulates the sun. This light source increases the lighting brightness and causes the object to cast a drop-shadow onto the ground plane. Shadow casting is supported when rendering with Rapid Refine and for previewing with Google Chrome; however, it is currently not supported by other browsers.
|IBL Camera Height||If the IBL background appears distorted near the horizon, it is possible to reduce or eliminate the distortion by adjusting this property.|
Lets you control the diffuse lighting. You may need to adjust this property manually to correct the lighting brightness if the Diffuse Lighting Environment Image is unusually bright or dark (for example, night scenes).