Example: barber
Physically Based Shading at Disney
A schematic view of this space along with two material samples is shown in Figure 3. Other slices are roughly just warped versions of that slice as shown in Figure 4. This observation has been exploited in recent work such as Romeiro (2008) [26] and Pacanowsi (2012) [24] as the basis for simpli ed isotropic BRDF models of the form f( h; d).
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