A mask consisting of dots moving with random linear motion on a transparent background. Various masks are possible ranging from direction coherence masks to more completely randomized masks. Dots move in straight lines with initial positions, directions, speeds, ages, and lifetimes randomized for each dot. If a dot reaches the edge of the mask area it wraps around to the opposite side. If a dot reaches the end of its lifetime it is replaced with new random position, velocity, and lifetime (and age 0).

Note that since masks are randomized and have a transparent background you can layer multiple masks on top of each other if you need one mask that has a mix of properties.

(Edge artifacts)

Minor artifacts at dot edges may be caused by the element display's default transparent background. These are usually insignificant. However, if you need to avoid them completely, you can set property backColor = <cds>"opaque"<cds> (okay if there is nothing for the element to occlude).

No—runs until any condition you set in property end.

size

Default: square with sides 15 deg

A number that is side length for a square mask area, or a vector [width height] for a rectangle (deg).

numDots

Default: 250

Number of dots. Can = 0.

dotDirection

Default: <cd>[0 180]<cd> = dots move in random directions

Dot motion direction clockwise, 0 = right (deg). Or a vector [direction, delta] setting direction ± delta to randomize for each dot.

dotSpeed

Default: <cd>[2 1]<cd> = dots move randomized between 1–3 deg/sec

Dot speed (deg/sec). Or a vector [speed, delta] setting speed ± delta to randomize for each dot.

dotLifetime

Default: <cd>[1.5 0.5]<cd> = dots last randomized between 1–2 sec

Dot duration before being replaced (sec). <cd>inf<cd> = no limit. Or a vector [lifetime, delta] setting lifetime ± delta to randomize for each dot.

dotSize

Default: 0.2 deg

Dot diameter (deg).

color

Default: white

A 1×3 RGB vector with numbers between 0–1.

numDots
position
nn_eyes
rotation
colorMask
alpha
intensity
contrastMult