mental ray Architectural and Design Visualization Shader Library

4.2 Depth of Field / Bokeh 101The use bokeh parameter enables the user of a specific bokeh map. When this parameter isused, the parameters bias, blade count and blade angle have no effect. The map definesthe shape of the DOF filter kernel, so a filled white circle on a black background is equivalentto the standard blur. Generally, one need more samples to accurately “resolve” a custombokeh map than the built-in bokeh shape, which has an optimal sampling distribution.A cross shaped bokeh mapChromatic Aberation via colored mapWith bias at 1.0, samples at 4, blade count at 0 and use bokeh off, this shader rendersan identical image to the old physical lens dof shader.