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A general note on settings plugins: when you create a new Renderer object there are no instances of them, so you will need to create them before changing parameters. If you start rendering the AppSDK will create a SettingsOutput and if the render mode is RT it will create SettingsRTEngine. On the other hand, if you're loading a scene from file, it will have instances of most (but not all) settings plugins and you need to use them. This is because every time V-Ray exports a vrscene file it automatically writes out the settings even if they are at default values.

Info
titleRecommended settings API

Starting with version 1.09 nightly builds after June 14th 2016, the VRayRenderer class includes the method setImprovedDefaults(). It creates (if necessary) some settings plugin instances and sets several parameters to values different from the plugin defaults. These values match the defaults used in our main products, such as V-Ray for 3dsMax and Maya. The plugin defaults couldn't be changed for compatibility reasons (keep old scenes working as they were). But the UI default values have changed over time. Many of the parameters and respective values that are set by setImprovedDefaults() are mentioned in the paragraphs below. These are just good initial values. Feel free to use them or not, or to overwrite some of them, for example reducing quality to get faster renders.

6.1. Image and region size

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