Niagara, a visible results system inside Unreal Engine, permits customers to create and manipulate dynamic particle results. One frequent situation is the necessity to alter the size of a particle system, whether or not to fine-tune the visible affect or reply to gameplay occasions. Thankfully, Unreal Engine supplies a number of strategies to regulate the size of Niagara techniques, enabling artists and builders to attain the specified visible outcomes.
One easy strategy to scaling Niagara particles entails modifying the “Preliminary Dimension” parameter throughout the Niagara System’s Particulars panel. This parameter instantly controls the preliminary scale of every particle when it’s emitted. By growing or lowering the worth of “Preliminary Dimension,” you may regulate the general measurement of the particle system. Nevertheless, this methodology solely impacts the preliminary scale and doesn’t permit for dynamic scaling over time.
For extra complicated scaling eventualities, Niagara presents the “Scale” module. This module allows you to apply a scale transformation to particles over their lifetime. By connecting the “Scale” module to the “Particle Replace” node and setting the specified scale values, you may create dynamic scaling results that fluctuate primarily based on elements comparable to particle age, velocity, or different parameters. Moreover, the “Scale” module permits for particular person management over the size alongside the X, Y, and Z axes, offering larger flexibility in shaping the particle system.
Resizing Niagara Methods
Niagara techniques will be resized within the following methods:
- By adjusting the Niagara system’s “Scale” property. This property is positioned within the “Particulars” panel of the Niagara system’s editor. The dimensions property can be utilized to extend or lower the dimensions of the Niagara system as a complete, in addition to to scale particular person elements of the system.
- By adjusting the “Scale” property of particular person Niagara modules. This property is positioned within the “Particulars” panel of every module’s editor. The dimensions property can be utilized to extend or lower the dimensions of the module’s output, in addition to to scale the module’s place and rotation.
- By utilizing the “Scale Vector” parameter. This parameter is offered in lots of Niagara modules. The dimensions vector parameter can be utilized to scale the output of the module in several instructions.
The next desk supplies a abstract of the other ways to resize Niagara techniques:
| Methodology | Description |
|---|---|
| Adjusting the Niagara system’s “Scale” property | Scales the complete Niagara system, together with all of its elements. |
| Adjusting the “Scale” property of particular person Niagara modules | Scales the output of particular person Niagara modules. |
| Utilizing the “Scale Vector” parameter | Scales the output of Niagara modules in several instructions. |
Setting Scale in Niagara Preview
Within the Niagara Editor, you may regulate the size of the preview viewport to get a greater view of your results. To do that, merely hover your mouse over the preview viewport and use the scroll wheel to zoom in or out. You can even maintain down the Ctrl key and drag the mouse to pan across the viewport.
Setting Scale in Niagara Preview
To vary the size of a Niagara system within the preview viewport, comply with these steps:
- Choose the Niagara system within the Content material Browser.
- Click on on the “Preview” button within the Niagara Editor toolbar.
- Hover your mouse over the preview viewport and use the scroll wheel to zoom in or out. You can even maintain down the Ctrl key and drag the mouse to pan across the viewport.
The dimensions of the Niagara system will probably be up to date in real-time as you make adjustments within the Niagara Editor.
| Motion | Keyboard Shortcut |
|---|---|
| Zoom in | Scroll wheel up |
| Zoom out | Scroll wheel down |
| Pan | Ctrl + drag |
Extra Data
You can even regulate the size of the Niagara preview viewport utilizing the “View” menu within the Niagara Editor toolbar. To do that, merely click on on the “View” menu and choose the “Zoom” possibility. You may then select from a wide range of zoom ranges, or you may enter a customized zoom stage within the “Zoom to” discipline.
Scaling A number of Emitters Concurrently
To scale a number of emitters concurrently in Niagara, you should use the next steps:
- Choose a number of emitters: Within the Niagara editor, choose the emitters you wish to scale.
- Open the Remodel panel: Click on on the “Remodel” tab within the Niagara editor.
- Modify the size: Within the Remodel panel, regulate the “Scale” values for the chosen emitters.
- Apply adjustments: Click on on the “Apply Adjustments” button to use the scaling to the chosen emitters.
- High-quality-tune particular person emitters: If mandatory, you may regulate the scaling of particular person emitters by right-clicking on the emitter and deciding on “Edit Remodel > Scale”. This lets you make extra exact changes to the size of every emitter.
Instance: Scaling a number of emitters with totally different scales
The next desk reveals an instance of tips on how to scale a number of emitters with totally different scales:
| Emitter | Scale |
|---|---|
| Emitter_A | 0.5, 1.0, 1.0 |
| Emitter_B | 1.0, 0.5, 1.0 |
| Emitter_C | 1.0, 1.0, 0.5 |
On this instance, Emitter_A is scaled down by half on the X-axis, Emitter_B is scaled down by half on the Y-axis, and Emitter_C is scaled down by half on the Z-axis.
Controlling Scale with Expressions
Niagara presents the pliability to regulate the size of results through expressions. Expressions are text-based snippets that carry out mathematical calculations and can be utilized to drive numerous parameters, together with scale.
The syntax for scale manipulation in Niagara expressions is:
| Expression | Description |
|---|---|
| GetScale() | Retrieves the present scale of the particle |
| SetScale(new_scale) | Units the size of the particle to the required worth |
| ScaleBy(scale_factor) | Multiplies the particle’s scale by the given issue |
Listed here are some sensible examples:
- To double the size of a particle:
SetScale(GetScale() * 2) - To scale back the size by half:
SetScale(GetScale() * 0.5) - To extend the size step by step over time:
ScaleBy(1 + (Time * 0.1))the place Time is the elapsed time
Using Scale Inheritance
Scale Inheritance in Niagara permits you to inherit and scale particle techniques primarily based on the size of a specified emitter. This method is especially helpful while you wish to create particle results that adapt to the dimensions of the thing they’re hooked up to. To make the most of Scale Inheritance:
1. Create an emitter to your particle system.
2. Choose the emitter within the Niagara editor.
3. Within the Particulars panel, navigate to the “Scale Mode” property.
4. Choose “Inherited” from the dropdown menu.
5. Specify the emitter whose scale you wish to inherit from within the “Father or mother Emitter” discipline.
6. Modify the “Scale Issue” property to regulate the size of the particle system relative to the father or mother emitter.
7. Superior Choices: You may additional customise the size inheritance by enabling the next superior choices:
| Possibility | Description |
|---|---|
| Lock Facet Ratio | Maintains the side ratio of the particle system |
| Lock X Scale | Prevents scaling the particle system alongside the X-axis |
| Lock Y Scale | Prevents scaling the particle system alongside the Y-axis |
| Lock Z Scale | Prevents scaling the particle system alongside the Z-axis |
By using Scale Inheritance, you may simply create particle techniques that scale dynamically primarily based on the dimensions of the objects they’re hooked up to, including depth and realism to your visible results.
Animating Scale Over Time
Niagara permits you to animate the size of particle techniques over time, creating numerous results comparable to rising or shrinking particles. This course of entails utilizing the “Set Scale” module within the Niagara system.
Set Scale Module
The “Set Scale” module units the size of the particle system at a particular time limit. By connecting it to the “Replace” occasion within the Niagara graph, you may apply the size transformation to the particles over time.
Customized Scale Curve
You need to use a customized curve to regulate the size animation. Proper-click on the “Set Scale” module and choose “Create Curve” to open the curve editor. Modify the curve factors to create the specified scale animation over time.
Static Scale
To set a continuing scale, merely enter a particular worth within the “Set Scale” module. It will end result within the particles having a set scale all through their lifetime.
Scale by Parameter
You can even scale the particles primarily based on a Niagara parameter. Create a brand new parameter within the “Parameters” part and assign it to the “Scale” enter within the “Set Scale” module. This lets you dynamically management the size utilizing the parameter.
Scale by Attribute
Alternatively, you may scale the particles primarily based on an present particle attribute. Choose the particle attribute from the “Choose Attribute” drop-down within the “Set Scale” module. This allows using attributes comparable to “Velocity” or “Place” to find out the size.
Scale by System Age
To scale the particles primarily based on their age, join the “Age” system attribute to the “Scale” enter within the “Set Scale” module. It will end result within the particles beginning with a sure scale at start and altering over time.
Scale by Velocity
By connecting the “Velocity” system attribute to the “Scale” enter, you may scale the particles primarily based on their velocity. This could create results comparable to making quicker particles bigger and slower particles smaller.
Scale by Distance to Emitter
Lastly, you may scale the particles primarily based on their distance from the particle system’s emitter. Connecting the “Distance to Emitter” system attribute to the “Scale” enter will end in particles changing into bigger or smaller as they transfer away from the emitter.
Change Niagara Scale
To vary the size of a Niagara system, you should use the “Scale” property within the “Remodel” module. This property permits you to specify the size of the system alongside the X, Y, and Z axes.
Frequent Pitfalls and Troubleshooting
1. The system just isn’t scaling appropriately
If the system just isn’t scaling appropriately, it’s doable that the “Scale” property just isn’t set appropriately. Ensure that the property is about to the specified scale.
2. The system is scaling too slowly or too rapidly
If the system is scaling too slowly or too rapidly, you may regulate the “Scale Over Time” property within the “Remodel” module. This property permits you to specify the velocity at which the system scales.
3. The system is scaling within the fallacious course
If the system is scaling within the fallacious course, you may regulate the “Scale Mode” property within the “Remodel” module. This property permits you to specify the course through which the system scales.
4. The system is scaling erratically
If the system is scaling erratically, it’s doable that the “Scale Axis” property just isn’t set appropriately. Ensure that the property is about to the specified axis.
5. The system is scaling incorrectly when the viewport is resized
If the system is scaling incorrectly when the viewport is resized, it’s doable that the “Scale Mode” property just isn’t set to “Viewport”. Ensure that the property is about to the specified scale mode.
6. The system is scaling incorrectly when the digital camera is moved
If the system is scaling incorrectly when the digital camera is moved, it’s doable that the “Scale Mode” property just isn’t set to “World”. Ensure that the property is about to the specified scale mode.
7. The system is scaling incorrectly when the system is performed again
If the system is scaling incorrectly when the system is performed again, it’s doable that the “Scale Over Time” property just isn’t set appropriately. Ensure that the property is about to the specified scale.
8. The system is scaling incorrectly when the system is paused
If the system is scaling incorrectly when the system is paused, it’s doable that the “Scale Over Time” property just isn’t set to “None”. Ensure that the property is about to the specified scale.
9. The system is scaling incorrectly when the system is stopped
If the system is scaling incorrectly when the system is stopped, it’s doable that the “Scale Over Time” property just isn’t set to “None”. Ensure that the property is about to the specified scale.
10. The system is scaling incorrectly when the system is reset
If the system is scaling incorrectly when the system is reset, it’s doable that the “Scale” property just isn’t set to the default worth. Ensure that the property is about to the specified scale.
Unreal Engine: The right way to Change Niagara Scale
To vary the size of a Niagara system, you should use the next steps:
- Choose the Niagara system within the World Outliner.
- Within the Particulars panel, navigate to the “Scale” property underneath the “Remodel” part.
- Enter a brand new worth for the size. You need to use any mixture of constructive and detrimental values to scale the system in several instructions.
Altering the size of a Niagara system will have an effect on the dimensions and orientation of all of the particles within the system. It may be used to create a wide range of results, comparable to making particles seem bigger or smaller, or to alter the course through which they transfer.
Folks Additionally Ask About Unreal Engine How To Change Niagara Scale
Can I scale a Niagara system in a different way in several instructions?
Sure, you may scale a Niagara system in a different way in several instructions through the use of the “Scale XYZ” property within the Particulars panel. This property permits you to specify a separate scale issue for every of the X, Y, and Z axes.
What occurs if I enter a detrimental worth for the size?
In case you enter a detrimental worth for the size, the Niagara system will probably be scaled in the wrong way. For instance, should you enter a worth of -1 for the size, the system will probably be mirrored round its origin.
