Image Processing Reference
In-Depth Information
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Fig. 7.9. Smooth shading.
(a) Gouraud shading [Gouraud71, Watt98]
(1) Calculate a normal vector at each vertex from results of measurement or
definitions of curved surfaces.
(2) Calculate the intensity (brightness) on a displayed image H P
of reflected
light at each vertex.
(3) Calculate brightness values at points on an edge by the linear interpolation
from those values at both end points (vertexes) of the edge.
(4) Determine a brightness value at a point P inside a face (polygon) by
interpolating brightness values at crossings of edges and the horizontal
line (scan line of a display image plane) passing the point P.
 
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