Angle Emitter (CPU and GPU) - Lumberyard User Guide

# Angle Emitter (CPU and GPU)

The Angle emitter spawns particles in a directional pattern based on the parameters. This is done to control the angle of emission from its source.

The following are parameters for the Angle emitter (CPU). Angle Emitter Parameters for CPU Attributes
Parameter Description
Focus Angle Specifies the number of degrees to rotate from the y-axis.

Valid values: 0 (up) – 180 (down)

Default value: 0

Focus Azimuth Specifies the number of degrees to rotate the new axis about the y-axis.

Valid values: any (0, 360 = North, 90 = West, 180 = South, 270 = East)

Default value: 0

Focus Camera Direction Sets the focus direction to face the camera. You can set a Random value and the Strength over Emitter Lifetime curve.

Valid values: 0 – 1

Default value: 0

Focus Gravity Direction Ignores the emitter rotation and focuses gravity on world Z.

Default value: false

Focus Rotates Emitter Default value: false
Emit Offset Direction If true, changes each particle's emission direction to align with its offset from the origin.

Default value: false

Emit Angle Sets the angle deviation of an emitted particle from the default focus (+Y) axis. 0 = up, 90 = horizontal, 180 = down. This is the maximum angle from the focus. You can set a Random value (determines minimum angle) and the Strength over Emitter Lifetime curve.
• To emit in all directions, set Emit Angle = 180, Random = 1.

• To emit in the top hemisphere, set Emit Angle = 90, Random = 1.

• To emit in a horizontal circle, set Emit Angle = 90, Random = 0.

Valid values: 0 – 180

Default value: 0

Curvature Sets how far to bend the vertex normals for Facing=Camera particles into a spherical shape. This affects lighting.

Valid values: 0 (flat) – 1 (hemispherical shape)

Default value: 1

The following are parameters for the Angle emitter (GPU). Angle Emitter Parameters for GPU Attributes
Parameter Description
Focus Angle Specifies the number of degrees to rotate from the y-axis

Valid values: 0 (up) – 180 (down)

Default value: 0

Focus Azimuth Specifies the number of degrees to rotate the new axis about the y-axis.

Valid values: any (0, 360 = North, 90 = West, 180 = South, 270 = East)

Default value: 0

Emit Angle Sets the angle deviation of an emitted particle from the default focus (+Y) axis. 0 = up, 90 = horizontal, 180 = down. This is the maximum angle from the focus. You can set a Random value (determines minimum angle) and the Strength over Emitter Lifetime curve
• To emit in all directions, set Emit Angle = 180, Random = 1.

• To emit in the top hemisphere, set Emit Angle = 90, Random = 1.

• To emit in a horizontal circle, set Emit Angle = 90, Random = 0.

Valid values: 0 – 180

Default value: 0