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 dimensions of a particle system, whether or not to fine-tune the visible influence or reply to gameplay occasions. Luckily, Unreal Engine offers a number of strategies to regulate the dimensions of Niagara programs, enabling artists and builders to realize the specified visible outcomes.
One simple method to scaling Niagara particles includes modifying the “Preliminary Measurement” parameter inside the Niagara System’s Particulars panel. This parameter instantly controls the preliminary scale of every particle when it’s emitted. By rising or reducing the worth of “Preliminary Measurement,” you possibly can modify the general dimension of the particle system. Nevertheless, this technique solely impacts the preliminary scale and doesn’t permit for dynamic scaling over time.
For extra complicated scaling eventualities, Niagara affords the “Scale” module. This module lets you 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 possibly can create dynamic scaling results that fluctuate based mostly on components similar to particle age, velocity, or different parameters. Moreover, the “Scale” module permits for particular person management over the dimensions alongside the X, Y, and Z axes, offering better flexibility in shaping the particle system.
Resizing Niagara Programs
Niagara programs could 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 size property can be utilized to extend or lower the scale of the Niagara system as an entire, 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 size property can be utilized to extend or lower the scale of the module’s output, in addition to to scale the module’s place and rotation.
- Through the use of the “Scale Vector” parameter. This parameter is out there in lots of Niagara modules. The size vector parameter can be utilized to scale the output of the module in numerous instructions.
The next desk offers a abstract of the other ways to resize Niagara programs:
| 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 numerous instructions. |
Setting Scale in Niagara Preview
Within the Niagara Editor, you possibly can modify the dimensions 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 may as well maintain down the Ctrl key and drag the mouse to pan across the viewport.
Setting Scale in Niagara Preview
To vary the dimensions 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 may as well maintain down the Ctrl key and drag the mouse to pan across the viewport.
The size of the Niagara system will probably be up to date in real-time as you make modifications within the Niagara Editor.
| Motion | Keyboard Shortcut |
|---|---|
| Zoom in | Scroll wheel up |
| Zoom out | Scroll wheel down |
| Pan | Ctrl + drag |
Further Data
You may as well modify the dimensions 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 quite a lot of zoom ranges, or you possibly can enter a customized zoom degree within the “Zoom to” subject.
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 Rework panel: Click on on the “Rework” tab within the Niagara editor.
- Alter the dimensions: Within the Rework panel, modify the “Scale” values for the chosen emitters.
- Apply modifications: Click on on the “Apply Modifications” button to use the scaling to the chosen emitters.
- Wonderful-tune particular person emitters: If needed, you possibly can modify the scaling of particular person emitters by right-clicking on the emitter and deciding on “Edit Rework > Scale”. This lets you make extra exact changes to the dimensions of every emitter.
Instance: Scaling a number of emitters with completely different scales
The next desk exhibits an instance of learn how to scale a number of emitters with completely 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 affords the pliability to manage the dimensions of results through expressions. Expressions are text-based snippets that carry out mathematical calculations and can be utilized to drive varied 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 dimensions 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 dimensions of a particle:
SetScale(GetScale() * 2) - To cut back the dimensions by half:
SetScale(GetScale() * 0.5) - To extend the dimensions steadily over time:
ScaleBy(1 + (Time * 0.1))the place Time is the elapsed time
Using Scale Inheritance
Scale Inheritance in Niagara means that you can inherit and scale particle programs based mostly on the dimensions of a specified emitter. This system is especially helpful if you wish to create particle results that adapt to the scale of the thing they’re hooked up to. To make the most of Scale Inheritance:
1. Create an emitter on 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 “Mum or dad Emitter” subject.
6. Alter the “Scale Issue” property to manage the dimensions of the particle system relative to the father or mother emitter.
7. Superior Choices: You may additional customise the dimensions inheritance by enabling the next superior choices:
| Possibility | Description |
|---|---|
| Lock Facet Ratio | Maintains the facet 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 possibly can simply create particle programs that scale dynamically based mostly on the scale of the objects they’re hooked up to, including depth and realism to your visible results.
Animating Scale Over Time
Niagara means that you can animate the dimensions of particle programs over time, creating varied results similar to rising or shrinking particles. This course of includes utilizing the “Set Scale” module within the Niagara system.
Set Scale Module
The “Set Scale” module units the dimensions of the particle system at a particular time limit. By connecting it to the “Replace” occasion within the Niagara graph, you possibly can apply the dimensions transformation to the particles over time.
Customized Scale Curve
You should use a customized curve to manage the dimensions animation. Proper-click on the “Set Scale” module and choose “Create Curve” to open the curve editor. Alter the curve factors to create the specified scale animation over time.
Static Scale
To set a relentless scale, merely enter a particular worth within the “Set Scale” module. This can end result within the particles having a set scale all through their lifetime.
Scale by Parameter
You may as well scale the particles based mostly 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 dimensions utilizing the parameter.
Scale by Attribute
Alternatively, you possibly can scale the particles based mostly on an current particle attribute. Choose the particle attribute from the “Choose Attribute” drop-down within the “Set Scale” module. This permits the usage of attributes similar to “Velocity” or “Place” to find out the dimensions.
Scale by System Age
To scale the particles based mostly on their age, join the “Age” system attribute to the “Scale” enter within the “Set Scale” module. This can 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 possibly can scale the particles based mostly on their pace. This will create results similar to making quicker particles bigger and slower particles smaller.
Scale by Distance to Emitter
Lastly, you possibly can scale the particles based mostly on their distance from the particle system’s emitter. Connecting the “Distance to Emitter” system attribute to the “Scale” enter will lead to particles turning into bigger or smaller as they transfer away from the emitter.
Change Niagara Scale
To vary the dimensions of a Niagara system, you should use the “Scale” property within the “Rework” module. This property means that you can specify the dimensions of the system alongside the X, Y, and Z axes.
Widespread Pitfalls and Troubleshooting
1. The system shouldn’t be scaling accurately
If the system shouldn’t be scaling accurately, it’s attainable that the “Scale” property shouldn’t be set accurately. Make it possible for the property is ready 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 possibly can modify the “Scale Over Time” property within the “Rework” module. This property means that you can specify the pace at which the system scales.
3. The system is scaling within the unsuitable route
If the system is scaling within the unsuitable route, you possibly can modify the “Scale Mode” property within the “Rework” module. This property means that you can specify the route during which the system scales.
4. The system is scaling inconsistently
If the system is scaling inconsistently, it’s attainable that the “Scale Axis” property shouldn’t be set accurately. Make it possible for the property is ready 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 attainable that the “Scale Mode” property shouldn’t be set to “Viewport”. Make it possible for the property is ready to the specified scale mode.
6. The system is scaling incorrectly when the digicam is moved
If the system is scaling incorrectly when the digicam is moved, it’s attainable that the “Scale Mode” property shouldn’t be set to “World”. Make it possible for the property is ready 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 attainable that the “Scale Over Time” property shouldn’t be set accurately. Make it possible for the property is ready 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 attainable that the “Scale Over Time” property shouldn’t be set to “None”. Make it possible for the property is ready 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 attainable that the “Scale Over Time” property shouldn’t be set to “None”. Make it possible for the property is ready 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 attainable that the “Scale” property shouldn’t be set to the default worth. Make it possible for the property is ready to the specified scale.
Unreal Engine: How one can Change Niagara Scale
To vary the dimensions 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 beneath the “Rework” part.
- Enter a brand new worth for the dimensions. You should use any mixture of optimistic and damaging values to scale the system in numerous instructions.
Altering the dimensions of a Niagara system will have an effect on the scale and orientation of all of the particles within the system. It may be used to create quite a lot of results, similar to making particles seem bigger or smaller, or to vary the route during which they transfer.
Folks Additionally Ask About Unreal Engine How To Change Niagara Scale
Can I scale a Niagara system otherwise in numerous instructions?
Sure, you possibly can scale a Niagara system otherwise in numerous instructions through the use of the “Scale XYZ” property within the Particulars panel. This property means that you can specify a separate scale issue for every of the X, Y, and Z axes.
What occurs if I enter a damaging worth for the dimensions?
If you happen to enter a damaging worth for the dimensions, the Niagara system will probably be scaled in the wrong way. For instance, in the event you enter a price of -1 for the dimensions, the system will probably be mirrored round its origin.
