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# Changing How to Trigger a Render

By default, you have to manually start a render by:

• right-clicking on a node and selecting one of the render options in the dropdown menu,

• using one of the menu options under Render, or

• clicking the 2D Update Mode on the Monitor tab.

Note: Using the 2D Update Mode only works on previously rendered 2D nodes, and not the currently viewed 2D node.

There are three different ways of triggering a render update. You can select your preferred method from the 2D Update Mode on the Monitor tab. The options are:

• Manual - changes to materials, lights, or geometry transformations don’t trigger a render update. To have the changes take effect, click the Trigger 2D Update button.

• Pen-Up - changes to materials, lights, or geometry transformations trigger a render update only when the mouse button is released or a parameter change is applied.

• Continuous - changes to materials, lights, or geometry transformations, including some manipulations in the Viewer tab, continuously trigger a render update.

2D Update Mode | Indicators
--- | ---
Manual mode |
Pen-up mode |
Continuous mode |

There is also a 3D Update Mode on the Monitor tab UI, used for live rendering 3D nodes. For 3D updates, please see the information on Live Rendering in Rendering Your Scene.

To change when Katana starts a render:

• Select Render > Manual Render to only start a render manually.

• Select Render > Pen-Up Render to start a render when you release the mouse after changing a parameter or the current time.

• Select Render > Drag Render to start a render while you are changing a parameter or the current time.

Tip: These options are also available at the top of the Monitor tab.