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There are six curves in Trapcode Particular. The controls are: Emission over Parent Life, Velocity over Life, Color over Life, Size over Life, Opacity over Life, and Blend Mode over Life.
In each instance of the curve, the controls behave in a similar way. The vertical axis of all curves is used to indicate the amount of an attribute. The horizontal axis is used to determine where those values fall in time, the left side controlling the beginning of the animation, and the right side of the graph controlling the end of the animation.
For example, in the Size over Life curve, if we drew a line that started on the bottom left (which indicates a small size value at the beginning of our animation) and ended at the upper right corner (which indicates a large size value at the end of the animation), our particle size would get larger over time.
Curves in Particular can now be animated. You can create two completely different Curves, and Particular will interpolate between them over time. Simply click the stopwatch next to the Curve to record the current shape of the Curve graph, and then animate this as you would any other After Effects property.
In the upper right corner of the curve interface, you’ll find a Presets drop down with many common curve types. While you get the most control from drawing your own curves in the graph (discussed below), using the curve presets can provide a faster shortcut to common curve shapes, or provide a jumping off point that you can customize with your own drawing. Note that the presets become significantly more powerful when using the other interface controls in the curve (discussed below).
There are six preset shapes to choose from:
You can also create curves by manually drawing them in with your mouse in the main curve window. Simply click and drag in the graph area with the pencil tool, and wherever you click will become the value for that attribute at that place in time in the life of the particle.
When manually drawing curves, you have two tools: a pencil (default), and a pen. The pencil allows you to draw the path as you would like. The pen tool allows you to set bezier control points on a curve, and then adjust those points to achieve the desired curve in the graph. Note that simply selecting the pen tool will also instantly apply a significant amount of smoothing to your curve.
These tools can also be used in tandem. For example, a curve can be quickly drawn manually with the pencil, and then by clicking the pen tool, the rough curve becomes smoother and easier to adjust.
In the upper right hand corner of the graph, the left-facing arrow allows you to undo the last action performed in the curve. After undoing an action, the arrow will face to the right and will allow you to redo the action just undone.
In the far right corner of the graph is the circular arrow, which is the Reset button. This button allows you to reset the curve control to get a fresh start.
The right side of the interface has Copy and Paste buttons that you can use to mimic behaviors in various curves throughout Particular, and even in other instances of Particular in other compositions in After Effects. Simply click the Copy button, and then in another curve, click the Paste button.
If you are using the pencil, you can click the smooth button to smooth out your results. This feature is gradually iterative, meaning that each time you click it, the curve result gets smoothed slightly.
Next to the Smooth button is the Randomize button.
This usually creates an extremely random result in the curve that would typically be very difficult to create manually.
To the right of the Randomize button, we find the Flip Curve button.
By clicking the Flip Curve button, the curve is flipped along the horizontal axis. This causes the results from the birth and death of the particle to be reversed.