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HDR ENVIRONMENT MAPS
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HDR images are commonly used to render 3D computer-generated objects or scenes. These images are typically panoramic images, which can be spherical or cubical images. They are called “environment maps”. They are used to place reflections on 3D objects, which will appear more realistic than with a LDR image, and to reproduce the effect of real light. This technique is also called « image-based lighting » (IBL), or « Global Illumination ». IBL rendering can be post-processed in most of CAD and 3D animation software available today (CATIA, Maya, 3ds Max, Lightwave…etc). The most recent graphic boards also support this type of rendering in real time.
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The advantage of a HDR panoramic image is that it allows the artist to save, with great accuracy, the lighting conditions that effect a precise location, and in every direction. The influence of each element of the décor is thus registered with its exact value (sun, lamps, colored elements…).
Consequently, 3D rendering using global illumination from HDR panoramas is the basis for various applications in photo-realistic real / virtual integration.
Creating panoramic HDR environment maps from photographs is now possible with Autodesk® Stitcher™ Unlimited 5.6 combined with an external HDR image creation software such as Adobe® Photoshop®, Photomatix® or HDR Shop.
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