Global switches - 3rd lesson

in the name of allah ...

i finished right now two lessons and this will be the third god willing ...

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Global switches

Displacement - enables (default) or disables V-Ray's own displacement mapping. Note that this has no effect on standard Max displacement mapping, which can be controlled via the corresponding parameter in the Render Scene dialog.

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Lights - enables or disables lights globally. Note that if you uncheck this, V-Ray will use the default lights. If you do not want any direct lighting in your scene, you must uncheck both this and the Default lights parameters.

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Default lights - enables or disables the usage of the default lights when there are no light objects in the scene or when you have disabled lighting globally

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Hidden lights - enables or disables the usage of hidden lights. When this is checked, lights are rendered regardless of whether they are hidden or not. When this option is off, any lights that are hidden for any reason (either explicitly or by type) will not be included in the rendering.

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Shadows - enables or disables shadows globally.

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Show GI only - when this option is on, direct lighting will not be included in the final rendering. Note that lights will still be considered for GI calculations, however in the end only the indirect lighting will be shown.

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Reflection/refraction - enables or disables the calculation of reflections and refractions in V-Ray maps and materials.

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Max depth - enables the user to limit globally the reflection/refraction depth. When this is unchecked, the depth is controlled locally by the materials/maps. When this option is checked, all materials and maps use the depth specified here.

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Maps - enables or disables texture maps.

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Filter maps - enables or disables texture map filtering. When enabled, the depth is controlled locally by the settings of the texture maps. When disabled, no filtering is performed.

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Max. transp levels - this controls to what depth transparent objects will be traced.

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Transp. cutoff - this controls when tracing of transparent objects will be stopped. If the accumulated transparency of a ray is below this threshold, no further tracing will be performed.

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Override mtl - this option allows the user to override the scene materials when rendering. All objects will be rendered with the chosen material, if one is selected, or with their default wireframe materials if no material is specified.

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Glossy effects - this option allows the user to replace all glossy reflections in the scene with non-glossy ones; useful for test renderings.

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Don't render final image - when this option is on, V-Ray will only calculate the relevant global illumination maps (photon maps, light maps, irradiance maps). This is a useful option if you are calculating maps for a fly-through animation.

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Secondary rays bias - a small positive offset that will be applied to all secondary rays; this can be used if you have overlapping faces in the scene to avoid the black splotches that may appear.

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so, i finished this lesson, i know it's almost boring but it needs to be tried by you yourself so you can observe the meaning of each parameter ...

hope you make use of the lesson...

comments are welcome ...