Figure 8

Use of real-time halftoning and bend textures for pen-and-ink style illustrative renderings. The human growth hormone protein image shown in Figure 7D is shown with a halftoning texture (upper right inset) and a bend texture (lower right inset) mapped onto the surface of each tube segment. The halftoning texture is mixed with lighting calculations, whereas the bend texture is multiplied by a bend factor from 0.0 to 1.0 that is determined by comparing the tangents at the very beginning and end of a segment.