The RADIANCE lighting simulation and rendering system
SIGGRAPH '94 Proceedings of the 21st annual conference on Computer graphics and interactive techniques
Rendering with radiance: the art and science of lighting visualization
Rendering with radiance: the art and science of lighting visualization
ACM Transactions on Graphics (TOG)
Interactive global illumination in dynamic scenes
Proceedings of the 29th annual conference on Computer graphics and interactive techniques
Enhancing and optimizing the render cache
EGRW '02 Proceedings of the 13th Eurographics workshop on Rendering
Combining edges and points for interactive high-quality rendering
ACM SIGGRAPH 2003 Papers
Implementing the render cache and the edge-and-point image on graphics hardware
GI '06 Proceedings of Graphics Interface 2006
Interactive rendering using the render cache
EGWR'99 Proceedings of the 10th Eurographics conference on Rendering
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Physically based global illumination rendering at interactive frame rates would enable users to navigate within complex virtual environments, such as archaeological models. These algorithms, however, are computationally too demanding to allow interactive navigation on current PCs. A technique based on image subsampling and spatiotemporal coherence among successive frames is exploited, while resorting to progressive refinement whenever there is available computing power. A physically based ray tracer (Radiance) is used to compute reflected radiance at the model's triangles vertices. Progressive refinement is achieved increasing the sampling frequency by subdividing certain triangles and requesting shading information for the resulting vertices. This paper proposes and evaluates different criteria for selecting which triangles to subdivide. A random criterium and two criteria based on Normalized Luminance Differences are evaluated: one operating on image space, the other on object space. Results, obtained with a model of an old roman town, show that the object space criterium is able to locate and represent visual discontinuities, such as shadows, and does so requiring less triangle subdivisions than the other two.