The absolute minimum and maximum values of each parameter can be found by hovering over its spinbox. The slider range does not indicate the parameter's total minimum and maximum input values. In Rhino 5 I had some display modes set up in which the lighting method is ‘No lighting’ and the objects are shaded with the rendering material. If a value below the current slider range is used, the slider again adjusts its range by shrinking it to twice the amount of the input value. If a value above that range is used the slider adapts by increasing its range accordingly (2x the input value) to maintain usability. Each slider is set to a default range of recommended or commonly used values.

Most numeric V-Ray parameters come with a slider to make fine-tuning easier.

You can reset the Input Number Slider's value to its default value by right-clicking on the slider and selecting the Reset context menu option. The context options of the Color Slot allow to Copy and Paste a color from one color slot to another, as well as to Reset the color selection to a default value. Similarly, all direct reflections of lights now go to the Specular element and all indirect reflections go to the Reflection element. The Lighting render element now contains all direct diffuse illumination and the GI element contains all indirect diffuse illumination.

In V-Ray Next Update 1.1 some of the render elements are rendered differently than before. Exceptions are the V-Ray Dome and Sun Light. V-Ray lights can be instanced by using the _Array command or Alt+drag the light object in the Rhino viewport. Since Rhino allows negative light intensity, V-Ray considers those as set to a value of 0. Sets the time to the current system location.

Negative intensity values are not allowed for any of the lights. Specifies the location and the Time Zone on Earth which is typically set from the closest city to the selected location.

Set up lighting city render rhino