Particles emitters

Particles emitters are used to display a large number of small particles. They simulate effects in a game. A few examples of particle emitters are fire, explosions, smoke, and dust.

The Particles Emitter object can be configured with a multitude of different parameters to create the desired effects.

Particles kind

To use the Particle Emitter, create a new object from the Objects list. A panel will open:

Select “Particles Emitters” from the list.

A new panel will popup. This panel contains the properties that can be set for your emitter. You will need to scroll down to view all of the properties available for the emitter.

There are 3 rendering modes available for Particle Emitters: Points, Lines and Textured.

  • Points mode, will display circles with the specified size.
  • Lines mode, will display lines with the specified length and thickness.
  • Textured mode, will display an image of the specified size.

Colors

  • You can choose a starting color for particles, and a color to fade to. You can also choose a starting a final value for the object's transparency.

Direction of emission

Particles will be emitted in the direction represented by the angle of the emitters on the scene. You can change the angle of the spray cone, which is also represented in the scene editor as two lines: a large value for this “spray cone” will result in an emission of particles in a large number of directions. A value of 0 will emit particles only in a single direction.

  • Particles appears in a sphere, around the position of the emitter object. You can change the radius of the sphere.
  • Gravity can be applied on particles, on X and Y axis. For example, a negative value on Y axis will cause the particles to go up in the air.
  • Friction influences particles deceleration over time.

Lifetime

  • Each particle has a limited lifetime that is chosen randomly between two values. These two values can be changed.
  • The quantity of particles contained in the emitter (“tank”) can be unlimited or fixed to a number. If the emitter is fixed to a number, the emitter will stop emitting after reaching the set number of particles.
  • The flow is the number of particles created every second. You can enter -1 to fire all particles in a single shot.

You can also change the maximum number of particles rendered by the object on screen . Note that this number changes the memory taken by the emitter. If this number is too big, it can cause the game to crash.

Examples