Information stored in a HDR image corresponds to a physical value of luminance, as opposed to a traditional low dynamic range image where information represents colors as they should appear on the screen. Unlike traditional images that encode pixel value between 0 and 1, HDR images encode pixels without a max bound. This texture can then be used for Image Based Lighting (IBL). With the newly added HDR reader in VTK 9.0, it is now possible to load a High Dynamic Range (.hdr file) image into a cubemap texture.
Now the journey to modern rendering in VTK continues with new features that allow to render more realistic scenes. Last year we introduced the beginning of Physically Based Rendering in VTK. Figure 1 – Old style IBL with a low dynamic range image (left), and the same environment with a high dynamic range format (right).
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