Increasing the Sampling Subdivisions level by a single value normally doubles the required render time. This means that 16 and 25 samples, respectively, will be calculated per pixel even in superfluous regions. For example, to make the blurred region of a motion blur effect visually appealing, you should use a relatively high value (e.g., 4 or 5).

This sampler subdivides each pixel in a defined number of sub-pixels, according to the value entered for the Sampling Subdivisions value.

Fixed: A definable and unchangeable per-pixel sample number (which will, however, already be increased in blurriness effect regions) will be calculated (comparable to the default renderer’s Best and Min/Max Antialiasing settings).

The Adaptive sampler renders slightly less sharp than the Fixed mode.

Special attention is paid to object edges, to which additional samples are applied to ensure that they are always antialiased optimally. On the other hand, if you choose a Sampling Quality of Custom, it’s more difficult to control because is calculates the following 4 values and distributes the samples accordingly: The Adaptive sampler is a much more intelligent sampler compared to the Fixed sampler, and often renders faster than the Fixed sampler. This mode is best for use in most cases because it offers a good compromise between quality and render speed (comparable with the default renderer’s Best Antialiasing setting). Adaptive: Depending on the settings defined, an increased sampling will take place at critical or important regions.The following generally applies: The more samples taken at critical regions, the better the final result will be (with correspondingly longer render times). colors), whose number far exceeds the number of pixels, will in the end be turned into pixels colors via an antialiasing filter. The Sampler has to determine which regions have to be sampled again with regard to antialiasing or blur effects (depth of field, motion blur, blurriness effects) in order to achieve the desired render quality. The Sampler does just that - it samples the Project’s cache from the angle of view of the camera in a pixel raster. These settings are available if you check the Use Physical Renderer box in the Detailed view of PhotoRendering Settings for the CineRender Engine.

Cinema 4d physical render