The Niagara Editor can be opened by double-clicking on any Niagara emitter or system, or through the context menu by right-clicking on a Niagara emitter or system and selecting Edit. This document identifies and describes the parts of the Niagara Editor. Because the user interface (UI) of the editor is mostly the same for both emitters and systems, descriptions for both have been included.
The tables below only describe commands that apply to the Niagara Editor itself; there may be additional commands displayed in those menus that open Asset editors or other parts of Unreal Editor.
Compiles all the modules in the emitter. You can also change the Auto-Compile settings by clicking the dropdown arrow. Click the dropdown to select the following options:
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Toggles real-time rendering in the viewport. Changes you make in the emitter stack will immediately be shown in the viewport, even if the emitter is not compiled.
Renders the scene in brushed wireframe. This displays the raw triangles of everything in the viewport, and turns off the back faces to make the scene more readable.
Renders the scene with detail lighting only. This means only lighting with normal data pulled from materials will be used. Color emitted from lights will affect the scene.
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Renders a color-coded view of what a Player or Pawn can collide with. Static Mesh collision displays as green, Volumes as pink, and Brushes as a grayish-violet.
This setting will render a color-coded view of what Actors in the scene will block visibility traces. Static mesh collision displays as green, volumes as pink, and brushes as a grayish-violet.
From the Parameters panel, you can drag and drop parameters to any appropriate node in the System Overview, or to any appropriate module parameter in the Selection panel. The number of times a parameter is referenced is shown on the right, enabling you to spot errors and make decisions on how to change your variables. If you have other emitters open, this panel pulls in data from those open emitters. This enables the user to share data between emitters. The Namespace for a parameter is displayed with a prominent icon, and you can see a tooltip that explains that Namespace when you mouse over the icon. To see more advanced Namespaces, such as parameter collections, click the Eye icon next to the Search bar.
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The System Overview panel gives a high-level overview of the system or emitter being edited, combining a pan-and-zoom Graph view with compact versions of the system or emitter stack. This panel makes it easier to navigate between different parts of the data, and it gives you a high level view when you open an emitter or system for the first time.
In a system, select an emitter in the Timeline panel and it will display the full stack for that emitter in the Selection panel. In this full stack view, the system information is on top, followed by the emitter module groups below. You can also get a full stack view of an emitter node or the system node by clicking on that node in the System Overview panel. However, if you want a less cluttered or more focused view, you can select an individual group or module within the emitter node in the System Overview to see just that group or module in the Selection panel.
The System Node has icons that identify each group of modules, as well as having colored dots next to modules that identify what that module or parameter affects.
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Emitter Properties has an icon that identifies whether the simulation is run on the CPU or the GPU. Other icons and colored dots on the emitter node help you identify the group, module, or parameter quickly.
With the Scratch Pad, you can create reusable modules or dynamic inputs that are contained locally in the active emitter or system Asset. This makes it easier to design and implement new custom modules or dynamic inputs, because you can see the results immediately within the emitter or system. You can keep or discard these at will. Once you have the result you are looking for, you can copy-paste the script to an existing Asset. You can also save it as a new Asset by right-clicking Scratch Script Selector and selecting Create Asset. The Scratch Pad also allows you to make something that is very specific to the active emitter or system, and does not need to be made into its own Asset.
There are two ways to open the Scratch Pad panel in the Niagara Editor. You can open it from the Windows menu, the way you would show or hide any other panel. The disadvantage to this method is that when you use the Scratch Pad to build a custom module, you need to manually add that module to your overall emitter or system script in the System Overview. You also have to add the module or dynamic input starting shell yourself, by clicking the Plus sign icon (+) next to Modules or Dynamic Inputs.
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The second way to open the Scratch Pad panel is to use the Plus sign icon (+) and selecting New Scratch Pad Module. This places a Scratch Pad module in your stack (wherever the new module will belong), which is automatically added to your script. You will also see that a shell for the new module or dynamic input is automatically added to your Scratch Pad Graph.
The UI of the Niagara Editor is somewhat complex. The next two sections will highlight some specific elements of the UI that might be confusing to new users.
When you click on a group in an emitter or system node, that entire group is displayed in the Selection panel. To the right of the group name, you will see a Plus sign icon (+), colored to match the group. When you click that icon, a list of available module categories displays. Click the dropdown next to the category name to expand it and see the modules in that category. Selecting the name of a module adds that module to the group.
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You can also click the Plus sign icon in the emitter or system node, directly in the System Overview. The same list will display.
With the Timeline panel, you can manage looping, loop count, bursts, random starts and stops, and spawn rate. All of these elements can interact right in the Timeline.
In a system, the Timeline panel lists all emitters active in that System, with metadata about what kind of renderers they use and the ability to toggle which emitters are active. You can control looping behavior using the Timeline, and you can set spawn burst keys in it as well. This is driven by module metadata, which can be extended by users if needed.
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This panel provides a Curve Editor that enables the user to adjust any values that need to change during the life of a particle, or across the life of an emitter. In order for any property to be editable within the Curve Editor, that property will need to have a Distribution type that utilizes a curve, such as
If there are any warnings or errors when compiling a script, emitter or system, they appear here. For many errors and warnings, you can click it in the Niagara Log panel and jump to the error's location in the Niagara Editor.
There are some additional panels that are not displayed by default, but that can be opened using the Window menu. By default, these panels will display as tabs in the area where the Selection panel displays, but you can drag and drop them to dock them somewhere else.
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With the Attribute Spreadsheet, you can filter and debug information coming from the CPU or GPU simulation. For all CPU VM-based effects, you can take advantage of the attribute debugger. It allows you to see the inputs to the simulation as well as the per-particle computed values.
The Attribute Spreadsheet targets the emitter or system previewed in the Preview panel. You can also target systems in a level by setting the in-level system to Force Solo, then selecting that system as a target in the Attribute Spreadsheet while you are in PIE (Play In Editor) mode.
This panel displays the generated HLSL and Assembly code for the selected emitter and owning system. This enables you to view and search that code. This tool is for advanced users who need to debug problems that may be difficult to spot with other methods.
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You can select the HLSL or Assembly code being displayed using the Scripts dropdown menu. To view a specific emitter's generated HLSL or Assembly code, follow these steps.This page provides an overview of Unreal Engine (UE) for users who are familiar with Unity. If you have some Unity knowledge and want to learn how to apply what you learned to working in Unreal Engine, the sections below will help you get started.
The Unreal Editor is where you work on your Unreal Engine project. The screenshot below shows Unity and Unreal Editor, side by side. Different areas are color-coded to indicate common functionality. Each block is labeled to show the
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