Volume rendering produces images directly from three-dimensional scalar or density fields by integrating colour and opacity along view rays, rather than rendering explicit surfaces.
Semantic Classification
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- Volume rendering casts rays through a volumetric dataset, accumulating emission and absorption according to a transfer function that maps data values to colour and opacity. It is used for medical imaging, scientific data and participating media such as smoke and clouds.
- The same ray integration underlies neural radiance fields, which represent a scene as a continuous volumetric function queried along rays. It connects volumetric video capture to display through the rendering pipeline.