ObjectVolumeProj Class

This class is used to create a volume projected object that simulates a light beam from a directional light source. It can be animated to create a flow of particles moving to the end of the beam and rotating, if necessary.

Projected volume object is rendered as a number of billboards, where each following billboard is bigger than the previous one.

ObjectVolumeProj Class

This class inherits from Object

Members

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ObjectVolumeProj (float size, float radius, float fov)

Constructor. Creates a new volume projected object with the given properties.

Arguments

• float size - Size of the smallest billboard in units.
• float radius - Length of the light beam along the Z axis in units.
• float fov - Angle of the beam cone in degrees. It controls the width of the light beam.

float getFov ()

Returns the width of the light beam, which is specified as the angle of the beam cone..

Return value

Angle in degrees.

float getRadius ()

Returns the length of the light beam along the Z axis in units.

Return value

Length in units.

float getRotation ()

Returns the angle of billboards rotation. This angle is set for the billboard at the end of the beam. If a positive value is set, the billboards will be rotated clockwise; if a negative value is set, the billboards will be rotated counterclockwise.

Return value

Rotation angle.

float getSize ()

Returns the size of the smallest billboard at the beginning of the beam.

Return value

Size of the smallest billboard in units.

float getStep ()

Returns the distance between neighboring billboards. The step controls how many billboards are used to render the volume projected object. The bigger the step, the less billboards are used to render the object.

Return value

Step between billboards.

float getVelocity ()

Returns the velocity with which billboards move to the end of the beam.

Return value

Billboards velocity.

void setFov (float fov)

Sets the width of the beam, which is specified as an angle of the beam cone.

Arguments

• float fov - Angle in degrees. The provided value will be saturated in the range [10;90].

void setRadius (float radius)

Sets a length of the light beam.

Arguments

• float radius - Length in units. If a negative value is provided, 0 will be used instead.

void setRotation (float angle)

Sets a angle of billboards rotation. This angle is set for the billboard at the end of the beam.

Arguments

• float angle - A rotation angle. If a positive value is set, the billboards will be rotated clockwise; if a negative value is set, the billboards will be rotated counterclockwise.

void setSize (float size)

Sets a size of the smallest billboard at the beginning of the light beam.

Arguments

• float size - Size of the smallest billboard in units. If a too small value is provided, 0.001 will be used instead.

void setStep (float step)

Sets a step between billboards. The step controls how many billboards are used to render the volume projected object. The bigger the step, the less billboards are used to render the object.

Arguments

• float step - Step between billboards. The provided value will be saturated in the range [0.1; 1]. By the value of 1, the beam is rendered discrete.

void setVelocity (float velocity)

Sets velocity with which billboards move to the end of the beam.

Arguments

• float velocity - Velocity of billboards.