Rhino 6 and newer - General tab

Set the maximum render time (in minutes) for the render. The longer the time, the cleaner and more accurate your image will be.

It stands for Sampling Level. The render will stop when this SL is reached. As with the “render time” parameter, a higher sampling level will give a cleaner and more accurate image. It is important to know that there is no standard SL value to get an acceptable quality level, because it depends entirely on the scene. Some scenes can be completely noise-free at SL=10 or even earlier, while others may need to get to SL=20 or higher. Usually, the easier for the light to reach the camera, the lower SL is required for the image to be clean.

You can choose the number of threads used by your computer for the render. 0 means all of them, -1 means all but one, 1 means, well, 1.

Here you can choose if you want to use CPU Production (the recommended for the render), CPU Draft (the same as Fire; it can load faster as it doesn’t write an mxi, render the channels and might be a bit faster as a preview, however the more complicated illumination may take more or not being possible with this engine) and GPU.

It sets the priority of the rendering process. Low will allow you to use your computer while rendering; if it’s not active, it will render in Below Normal.

Here you can add flags to the render in order to get more functionalities. Please, check these running flags and these parameters.

Multilight will be disabled and the MXI file won’t store each light separately. You will only be able to change the ISO and shutter controls to expose more or less the render.

The render will show one slider per emitting material or Multilight group. You will be able to change the intensity of the different light independently.

In this mode, you will be able to change both the intensity and the color of the emitters. This will only work for Area emitters that are not working emitting in Temperature or HDR image color mode. The emitters that are not supported to display the color, will revert to intensity only mode. Also, the GPU engine only supports the intensity mode.

All the lights will be composited into one single image with the contribution of all the lights.

The output of the render will generate one render image per Multilight slider with the contribution of each light to the scene.

Activate or deactivate this feature here

Here you can choose which mask type you will use to define the area that will continue rendering after the main SL limit has been reached. You can choose between a Custom Alpha channel, the Alpha channel or a bitmap of your choice. Obviously, the Custom Alpha and the Alpha channel have to be on (in the Output tab) for those options to work.

Set here the final sampling level of the extra sampling area; this one should be higher than the general SL limit of the render.

Here you can choose the specific custom alpha you want to use if you are using this mask type. You will find a button to the right to open the Custom Alpha Editor or create a new custom alpha channel.

Here you can load a bitmap from your computer to use it as a mask.

Activate this checkbox to invert the extra sampling mask.