scatter3

Display point cloud in scatter plot

Syntax

scatter3(pcloud)
scatter3(pcloud,Name,Value)
h = scatter3(___)

Description

example

scatter3(pcloud) plots the input pcloud point cloud as a 3-D scatter plot in the current axes handle. If the data contains RGB information for each point, the scatter plot is colored accordingly.

scatter3(pcloud,Name,Value) provides additional options specified by one or more Name,Value pair arguments. Name must appear inside single quotes (''). You can specify several name-value pair arguments in any order as Name1,Value1,...,NameN,ValueN)

h = scatter3(___) returns the scatter series object, using any of the arguments from previous syntaxes. Use h to modify properties of the scatter series after it is created.

When plotting ROS point cloud messages, MATLAB® follows the standard ROS convention for axis orientation. This convention states that positive x is forward, positive y is left, and positive z is up. However, if cameras are used, a second frame is defined with an “_optical” suffix which changes the orientation of the axis. In this case, positive z is forward, positive x is right, and positive y is down. MATLAB looks for the “_optical” suffix and will adjust the axis orientation of the scatter plot accordingly. For more information, see Axis Orientation on the ROS Wiki.

Examples

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Connect to a ROS network. Subscribe to a point cloud message topic.

rosinit('192.168.154.131')
sub = rossubscriber('/camera/depth/points');
pause(1)
Initializing global node /matlab_global_node_47682 with NodeURI http://192.168.154.1:60789/

Get the latest point cloud message. Plot the point cloud.

pcloud = sub.LatestMessage;
scatter3(pcloud)

Plot all points as black dots.

scatter3(sub.LatestMessage,'MarkerEdgeColor',[0 0 0]);

Input Arguments

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Point cloud, specified as a PointCloud2 object handle for a 'sensor_msgs/PointCloud2' ROS message.

Name-Value Pair Arguments

Specify optional comma-separated pairs of Name,Value arguments. Name is the argument name and Value is the corresponding value. Name must appear inside quotes. You can specify several name and value pair arguments in any order as Name1,Value1,...,NameN,ValueN.

Example: 'MarkerEdgeColor',[1 0 0]

Marker outline color, specified 'flat', an RGB triplet, a hexadecimal color code, a color name, or a short name. The default value of 'flat' uses colors from the CData property.

For a custom color, specify an RGB triplet or a hexadecimal color code.

  • An RGB triplet is a three-element row vector whose elements specify the intensities of the red, green, and blue components of the color. The intensities must be in the range [0,1]; for example, [0.4 0.6 0.7].

  • A hexadecimal color code is a character vector or a string scalar that starts with a hash symbol (#) followed by three or six hexadecimal digits, which can range from 0 to F. The values are not case sensitive. Thus, the color codes '#FF8800', '#ff8800', '#F80', and '#f80' are equivalent.

Alternatively, you can specify some common colors by name. This table lists the named color options, the equivalent RGB triplets, and hexadecimal color codes.

Color NameShort NameRGB TripletHexadecimal Color CodeAppearance
'red''r'[1 0 0]'#FF0000'

'green''g'[0 1 0]'#00FF00'

'blue''b'[0 0 1]'#0000FF'

'cyan' 'c'[0 1 1]'#00FFFF'

'magenta''m'[1 0 1]'#FF00FF'

'yellow''y'[1 1 0]'#FFFF00'

'black''k'[0 0 0]'#000000'

'white''w'[1 1 1]'#FFFFFF'

'none'Not applicableNot applicableNot applicableNo color

Here are the RGB triplets and hexadecimal color codes for the default colors MATLAB uses in many types of plots.

RGB TripletHexadecimal Color CodeAppearance
[0 0.4470 0.7410]'#0072BD'

[0.8500 0.3250 0.0980]'#D95319'

[0.9290 0.6940 0.1250]'#EDB120'

[0.4940 0.1840 0.5560]'#7E2F8E'

[0.4660 0.6740 0.1880]'#77AC30'

[0.3010 0.7450 0.9330]'#4DBEEE'

[0.6350 0.0780 0.1840]'#A2142F'

Example: [0.5 0.5 0.5]

Example: 'blue'

Example: '#D2F9A7'

Parent of axes, specified as the comma-separated pair consisting of 'Parent and an axes object in which to draw the point cloud. By default, the point cloud is plotted in the active axes.

Outputs

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Scatter series object, returned as a scalar. This value is a unique identifier, which you can use to query and modify the properties of the scatter object after it is created.

See Also

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Introduced in R2015a