POV-Ray : Documentation : General Pane
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4.5.1 Preferences Dialog Editor Pane General Pane

This pane contains settings for the POV-Ray application features like the speed it will render, or the render engine core being used.

General Preferences Dialog Pane Fast Preview Mode

If fast Preview Mode is enabled, the preview window will only be updated for each line that has been rendered. If it is off, the preview window will show each pixel being rendered, which will slow down rendering of very simple scene (that take just a few secvonds to render) as the overhead of drawing each pixel in particular on Mac OS X is significant.

For scenes that take several hours to render this option makes no significant difference. Expect rendering to take an addition ten to twenty seconds (depending of preview image size) regardless of scene complexity if Fast Preview Mode is turned off. Fast Functions

Enable this option to turn on the POV-Ray Mac just-in-time compiler for the "function" keyword. It turns equations in functions to native PowerPC code executed directly instead of interpreting the equations. This will for example increase rendering speed of isosurfaces. However, certain statistics will not be gathered if Fast Functions is enabled and the just-in-time compilation does slow down parsing a tiny bit and does increase memory consumption. Background Rendering

By default POV-ray rendering takes place in the background (in a separate thread) and as such leaves the user interface of POV-Ray responsive. However, especially on Mac OS 8 and 9 on slow Macs with little memory and virtual memory enabled, tuurning this option off may increase rendering speed. However, disabling Background Rendering will make POV-Ray less responsive and on Mac OS X it may appear as if it has crashed due to Mac OS X automatically disabling window updates of unresponsive applications. On Mac OS 8 and 9 the whole system will be slow in responding when Background Rendering is disabled! Use Temporary Memory

On Mac OS 8 and9 each application has a limited amount of memory assigned to it. Enable this option such that wehn rendering POV-Ray will aquire additional memory from the operating system when rendering, regardless of the application memory size you set for the POV-Ray application.

On Mac OS X applications may always use all available memory and as such, this option is disabled when running on Mac OS X! Render Engine

The popup menu allows you to select which renderer will be used to render your images. You may select different versions optimised for different processors. Versions that cannot run on your system are shown, but cannot be selected.

Further, this menu may contain render engines of unofficial versions or custom compiles of POV-Ray that you installed by copying them into the "POV-Ray Cores" folder inside the POV-Ray application folder. Note that this folder will only be searched when you start the POV-Ray applications, and if you added or removed render engines from the folder, you will need to restart the POV-Ray application in order to see those changes!

4.5.1 Preferences Dialog Editor Pane

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