Hi Alessandro,
For image-based lighting, you can have a look in the Orange Book
(OpenGL Shading Language), chapter 12 (Lighting). There are some
shaders for image-based lighting with a cube map, and you can use them
with a HDR cube map (have a look in the osgvertexprogram for cube map
example, and use the hdr or exr plugin to load your hdr images).
Best regards,
Josselin.
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