Smooth Shading Research Articles

Empirical Studies of Interactive Computer Graphics: Perceptual and Cognitive Issues

Two experiments were performed to test the effects of varying computer graphics realism cues (wireframe vs. solid figures, flat vs. smooth shading for solid figures, and one or two light sources for solid figures) on the performance of a standard cognitive task (mental rotation) and on the subjective perceived realism of the computer-generated images. In the mental rotation experiment, mean reaction times were slower for wireframe than for smooth and flat shaded images and significant effects for figure complexity and angle of rotation were shown. In the second experiment, subjective ratings of image realism indicated that wireframe images were viewed as less realistic than solid model images and that number of light sources was more important in conveying image realism to users than was the type of shading.

A 3-D Graphics Display System With Depth Buffer and Pipeline Processor

A description is given of the algorithm used for high-speed rendering of color-shaded, three-dimensional images on a raster display terminal currently under development. This terminal features: a depth buffer for hidden surface removal; a processing speed of 10000 polygons per second; smooth shading; antialiasing; subpixel addressability and subpixel detail; transparency; local segment memory; local viewing transformation; a nondestructive 3-D cursor; a cutting plane that works at any angle; and contouring.

On the rendering of surfaces

Despite the relative sophistication of modern surface design systems, many graphical renderings of surfaces are rather crude. The paper discusses several possible renderings, including various line drawings methods, realistic and functional shading, and combinations of line drawings and smooth shading. It concludes that a good choice is the superposition of contours or sections on either realistic or Gaussian curvature shading.