IRender Presets Tab

IRender Presets Tab

The Presets tab is used to select redefined lighting settings and make adjustments to them.

nXt is designed to simulate real-world lighting. Use the following guidelines when lighting your model:

  • Provide accurate information whenever possible. Avoid using unrealistic intensity levels for light sources.
  • Adjust the overall brightness of your rendering by using the Brightness control on the rendering display. Do not attempt to adjust the overall scene brightness by changing the intensity of all of the light sources. nXt's automatic exposure adjustment will be working against you if you attempt to do this.


Lighting Presets

Lighting Presets


The Presets lets you choose predefined settings for the most common lighting situations.

There are a lot of settings to create special lighting effects. The presets make it easier to get a good rendering without having to make all the setting manually.

Standard Presets

nXt provides four lighting presets which can help get you started when deciding how to light your model. There are many more lighting options available, but the presets are often sufficient for many different renderings. The Presets icons are available on the Presets Setup Tab. Choose the Preset which most closely resembles your scene:

High Dynamic

mimics the lighting which might be found in a photographer's studio. It is most useful for rendering small to medium sized objects in isolation.

The primary lighting is provided by an high dynamic range image file (HDRi). The light from the HDRi has been artificially dimmed, to resemble the interior lighting levels of the studio. You can modify the HDRi settings and file on the HDRi Setup Tab . You can add artificial lights to your scene using the Lights tab.


is used for daylight simulations of architectural exteriors. A sun and natural sky are simulated.

The sun and sky settings can be modified on the Sky Setup Tab . You can specify sun angles directly or you can use geographical location and date and time. The default visible background for this preset is the simulated sky.

Interior with Sun

Interior Daylight allows you to simulate an architectural interior during the day, lit by natural light.

For an interior daylight simulation to work properly, you must use a transparent material to represent the glass in your windows. Sun and sky settings are similar to the Exterior preset. Interior Lighting.

Interior - no Sun

provides a simulation of an architectural interior at night, lit by artificial luminares.

For this simulation to work properly, you must add artificial lights to your model.

HDRi Sky

The HDRi Sky preset loads a HDRi background and sky - Bear Mountain - and make other settings to make the sky visible.

After selecting this preset, you can easily use the HDRi tab to select other skies.

Additional Notes on Presets

Image by by Christopher Alan Krupp on the IRender nXt forum. Lighting balanced with Lighting Channels. Click to view full size.
  • Indirect lighting - the lighting reflected off of surfaces, is on when one of the two interior presets are selected and off for studio and exterior. This type of lighting is a very significant component of an interior simulation. For exteriors and studio models the effects of indirect lighting is more subtle. You can turn on indirect lighting for exteriors and studio models if you want this additional realism (at a substantial performance cost.)
  • Interior daylight mode and exterior mode do not have artificial lights enabled. You can add artificial lights to these presets if you wish by following the procedure here.
  • Night time renderings can be a little tricky. The Brightness slider, and Lighting Channels can make it much easier to balance the lighting.

See also