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Particle Emission

The Emitter system works just like its name says: it emits/produces particles for a certain amount of time. In such a system, particles are emitted from the selected object from the Start frame to the End frame and have a certain lifespan. These particles are rendered default as Halos, but you may also render these kind of particles as objects (depending on the particle system’s render settings, see Visualization).

Options

Image 2a: Settings for particle Emission.

The buttons in the Emission panel control the way particles are emitted over time:

Amount
The maximum amount of parent particles used in the simulation.
Start
The start frame of particle emission. You may set negative values, which enables you to start the simulation before the actual rendering.
End
The end frame of particle emission.
Lifetime
The lifetime (in frames) of the particles.
Random
A random variation of the lifetime of a given particle. The shortest possible lifetime is Lifetime×(1-Rand). Values above 1.0 are not allowed. For example with the default Lifetime value of 50 a Random setting of 0.5 will give you particles with lives ranging from 50 frames to 50×(1.0-0.5)=25 frames, and with a Random setting of 0.75 you’ll get particles with lives ranging from 50 frames to 50×(1.0-0.75)=12.5 frames.


Emission Location

Emit From parameters define how and where the particles are emitted, giving precise control over their distribution. You may use vertex groups to confine the emission, that is done in the Vertexgroups panel.

Verts
Emit particles from the vertices of a mesh.
Faces
Emit particles from the surface of a mesh's faces.
Volume
Emit particles from the volume of an enclosed mesh.

Distribution Settings

These settings control how the emissions of particles are distributed throughout the emission locations

Random
The emitter element indices are gone through in a random order instead of linearly (one after the other).

For Faces and Volume, additional options appear:

Even Distribution
Particle distribution is made even based on surface area of the elements, i.e. small elements emit less particles than large elements, so that the particle density is even.
Jittered
Particles are placed at jittered intervals on the emitter elements.
Particles/Face
Number of emissions per face (0 = automatic).
JitteringAmount
Amount of jitter applied to the sampling.
Random
Particles are emitted from random locations in the emitter’s elements.
Grid
Particles are set in a 3d grid and particles near/in the elements are kept.
Invert Grid
Invert what is considered the object and what is not.
Hexagonal
Uses a hexagonal shaped grid instead of a rectangular one.
Resolution
Resolution of the grid.
Random
Add a random offset to grid locations.
Use Modefier Stack
Emit particles from mesh with modifiers applied (must use same subsurf level for viewport and render for correct results)


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Your mesh must be watertight to emit particles from the volume.
Some modifiers like Edge Split break up the surface, in which case volume emission will not work correctly!




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This is the old manual!
For the current 2.7x manual see http://www.blender.org/manual/


User Manual

World and Ambient Effects

World

Introduction
World Background

Ambient Effects

Mist
Stars (2.69)


Game Engine

Introduction

Introduction to the Game Engine
Game Logic Screen Layout

Logic

Logic Properties and States
The Logic Editor

Sensors

Introduction to Sensors
Sensor Editing
Common Options
-Actuator Sensor
-Always Sensor
-Collision Sensor
-Delay Sensor
-Joystick Sensor
-Keyboard Sensor
-Message Sensor
-Mouse Sensor
-Near Sensor
-Property Sensor
-Radar Sensor
-Random Sensor
-Ray Sensor
-Touch Sensor

Controllers

Introduction
Controller Editing
-AND Controller
-OR Controller
-NAND Controller
-NOR Controller
-XOR Controller
-XNOR Controller
-Expression Controller
-Python Controller

Actuators

Introduction
Actuator Editing
Common Options
-2D Filters Actuator
-Action Actuator
-Camera Actuator
-Constraint Actuator
-Edit Object Actuator
-Game Actuator
-Message Actuator
-Motion Actuator
-Parent Actuator
-Property Actuator
-Random Actuator
-Scene Actuator
-Sound Actuator
-State Actuator
-Steering Actuator
-Visibility Actuator

Game Properties

Introduction
Property Editing

Game States

Introduction

Camera

Introduction
Camera Editing
Stereo Camera
Dome Camera

World

Introduction

Physics

Introduction
Material Physics
No Collision Object
Static Object
Dynamic Object
Rigid Body Object
Soft Body Object
Vehicle Controller
Sensor Object
Occluder Object

Path Finding

Navigation Mesh Modifier

Game Performance

Introduction
System
Display
Framerate and Profile
Level of Detail

Python API

Introduction
Bullet physics
VideoTexture

Deploying

Standalone Player
Licensing of Blender Game

Android Support

Android Game development