| OCR Text |
Show 14 The deformation of the shading technique 1.9). Assuming (l= l vectors , ... ,n). Ni the are from direction of any sight point and the the light following example (see Figure 1.8a): and triangular is source : square eye onto of the on the optics, reflected . R2 source, (EP2,R2), sphere depends reflected light vector where E is the on the that at from common angle made For point. position of the is the direction of the reflected light greater than ninety degrees, it away plane. a received light point P2. that the direction of means the eye; there will be at the at example, If function a the and eye the by between the point P 1 of the Figure 1.10a, the specular reflected light intensity is of the angle facets located at the eye of the projection of the sphere and the a smooth Gouraud using directions of the normals to the sphere at vertices Pi By simple laws observer highlights certain number of a that observer, Figure 1.10a shows The the be illustrated with the can A sphere is approximated with (Figure of shape this light angle is light is reflected no specular reflected light received by the of the eye from this point. In of Figure 1.10b , the specular reflected all the reflected reflected light size the light received is received light this at point by dots by the. the is the largest. interpolation sphere same From no point P2 of amount the points P2, P3, intensity At point therefore eye, while there is displayed is amount occurs: of in the using of the shade function for smooth following phenomenon the and the P6 and other P7,. a specular from the rest of the vertices. When the . . proportional to eye from this eye, part only of the reflected light strikes the component is shading of representing with specular reflected light, Gouraud a the scheme the curved contour the of linear surface, points which the have shape of this contour is not a |
