Sets the number of images that are stored for recall with the Previous/Next tools. The default value is 100. If set to 0, the limit for storing number of images is disabled and you can have as many history images as you have space to store them.

Set the dots per inch for display and printing.

Sets the units for rendering and saving images. Options are pixels, in(ches), mm, or cm.

Controls the size (in pixels) of the sub-image "buckets" that are produced during the rendering process. The default bucket size is 32, which means that each bucket will be 32 pixels wide and 32 pixels high.

If the bucket size is large, more memory is required but the speed improves. However, if you are using multiple threads, a smaller bucket size results in a better load balanced total frame. When using multiple buckets, all the buckets do not finish computing at the same instant. Therefore, there will be one bucket/thread computing when the other bucket(s)/thread(s) are finished.

If the bucket size is very large, the render engine uses only one thread for more time. This decreases the impact of additional processors on the final render time. On the other hand, if the bucket size is very small, the render time increases since there is some processor overhead in managing the buckets.

Option menu that lets you select the number of threads used by the Luxology rendering engine. This lets you optimize how much processing power is left over for tasks besides rendering.

Do not set this value higher than the number of cores available on the computer. For the best rendering performance, set this option to Automatic (the default).

Sets the cache size for geometry created by the Material Fur Settings in the Advanced Mode settings of the Material Editor dialog.

If on, when rendering an image or using Fast Preview, stores extra information about the scene being rendered. This information makes it possible to see the results in either a redisplay rendering or Fast Preview of adjustments to material map parameters like size, units, and mapping mode. Storing this extra information is memory intensive, so turn off this option unless you are making explicit use of it.