Different color for each cube in CUBE_LIST using std_msgs/ColorRGBA[]

edit

Hey there,

I have a problem creating a CUBE_LIST with different colors for each cube. Below is my code. The strange thing is, that when setColor is set to true, all cubes are drawn in the same color (as expected in green), but when it is set to false, nothing is shown at all. How exactly is the use of the markerMsg attribute colors? Do you see the mistake I made? In the documentation it states "In visualization 1.1+ will also optionally use the colors member for per-vertex color.". How can I find out which version of visualization I am using? I have ros fuerte installed.

ros::Publisher pubTrackMarkers;
pubTrackMarkers = n.advertise<visualization_msgs::Marker>("/track_markers",queue_size, true);
visualization_msgs::Marker markerMsg;

markerMsg.header.frame_id  = "/trackMarkers_frame";
markerMsg.ns = "trackMarkers";
markerMsg.action = visualization_msgs::Marker::ADD;
markerMsg.pose.orientation.w = 1.0;
markerMsg.type = visualization_msgs::Marker::CUBE_LIST;
markerMsg.scale.x = 0.8f;
markerMsg.scale.y = 0.8f;
markerMsg.scale.z = 0.8f;
if (setColor){
    markerMsg.color.r = 0;
    markerMsg.color.g = 1;
    markerMsg.color.b = 0;
    markerMsg.color.a = 1;
}

for (int i=0; i<10; i++){
    geometry_msgs::Point temp;
    temp.x = i;
    temp.y = 1;
    temp.z = 0.5;
    markerMsg.points.push_back(temp);
    std_msgs::ColorRGBA c;
    c.r = (float)i/10.0;
    c.g = 0;
    c.b = 0;
    c.a = 1;
    markerMsg.colors.push_back(c);
}

pubTrackMarkers.publish(markerMsg);
markerMsg->points.clear();
markerMsg->colors.clear();

Thank you so much for your help! Jens

edit: solved! added the line "markerMsg->colors.clear();" now the number of color values and points is the same and it works. Thanks everyone!