Rendering trees with indirect lighting in real time
EGSR'08 Proceedings of the Nineteenth Eurographics conference on Rendering
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Trees have earned a reputation among lighting artists for being difficult to light in an appealing way. A tree canopy is composed of a myriad of leaves facing random directions. Without shadows, standard diffuse lighting of a canopy yields unappealing visual noise.In Over the Hedge and Shrek III, we derive a set of aggregate normals that account for the shape of a leaf canopy. Combining this normal with the geometry normal of each leaf before shading yields a more appealing tree shape.