For pinterp, feed the output of pmdblur to the standard input of pinterp and apply the -B option to blur views together. In most cases, two pictures with z-buffers at v0 and v1 will get a satisfactory result, though the perfectionist may wish to apply the -ff option together with the -fr option of pinterp.
To use pmdblur with rpict, apply the -S option to indicate a rendering sequence, and set the -o option with a formatted file name to save multiple output pictures. When all the renderings are finished, combine them with the pcomb(1) program, using appropriate scalefactors to achieve an average. Note that using rpict is MUCH more expensive than using pinterp, and it is only recommended if the scene and application absolutely demand it (e.g. there is prominent refraction that must be modeled accurately).
For both pinterp and rpict, the computation time will be proportional to the number of views from pmdblur. We have found a nsamp setting somewhere between 7 and 15 to be adequate for most images. Relatively larger values are appropriate for faster camera motion.
The -pm and/or -pd options of rpict may be used instead or in combination to blur animated frames, with the added advantage of blurring reflections and refractions according to their proper motion. However, this option will result in more noise and expense than using pmdblur with pinterp as a post-process. If both blurring methods are used, a smaller value should be given to the rpict -pm option equal to the shutter speed divided by the number of samples, and the -pd option equal to the aperture divided by the number of samples. This will be just enough to blur the boundaries of the ghosts which may appear using pmdblur with a small number of time samples.
To simulate a particular camera's aperture, divide the focal length of the lens by the f-number, then convert to the corresponding world coordinate units. For example, if you wish to simulate a 50mm lens at f/2.0 in a scene modeled in meters, then you divide 50mm by 2.0 to get 25mm, which corresponds to an effective aperture of 0.025 meters.