Start Size and Rotation

Learn particle start with Start Size and Start Rotation.

Start Size (Initial Size)

The initial size of particles when spawned is defined by the startSize property in the main module. You can assign either a fixed value (such as 1.0f) or a random size between two constants. Randomizing sizes gives particles a significantly more natural and organic look.

var main = ps.main;
main.startSize = 0.5f;

Start Rotation (Initial Rotation)

The initial angle at which particles launch is determined by startRotation. To prevent all particles from facing the exact same direction, a random initial angle between 0 and 360 degrees is often assigned. This makes leaves, dust, or smoke scatter much more realistically.

var main = ps.main;
main.startRotation = 45f;

Exercise Assign Size and Rotation Values

Assign 2.0f to main.startSize and 90f to main.startRotation. Print results with Debug.Log("Boyut: " + main.startSize); and Debug.Log("Donus: " + main.startRotation); respectively.

Show example solution

using System;

public class MainModule
{
    public float startSize = 1.0f;
    public float startRotation = 0f;
}

public static class Debug
{
    public static void Log(object message) => Console.WriteLine(message);
}

public class Program
{
    public static void Main()
    {
        MainModule main = new MainModule();
        main.startSize = 2.0f;
        main.startRotation = 90f;
        Debug.Log("Boyut: " + main.startSize);
        Debug.Log("Donus: " + main.startRotation);
    }
}

Test yourself

Which main module property defines the initial size of particles when they first appear in the scene?
- startSpeed
- startLifetime
- startColor
- startSize
Show answer

startSize — startSize specifies the initial scale of particles at the time they spawn.
Define Start Size
```
main.____ = 2.5f;
```
Show answer
```
main.startSize = 2.5f;
```
Initial Values

startSize

Particle's initial size at birth
startRotation

Particle's initial rotation angle
Random Between Two Constants

Random values between two boundaries
startSpeed

Initial launch speed of the particle

Next lesson: Play and Stop

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