Rviz Triangle List bad rendering

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Problem

I want to visualize some planes in rviz. For this purpose, I separated each plane in triangles and used the triangle list marker in rviz. Unfortunately, the rendering ist buggy. Has anyone an idea?

Front view

Side View

Code snippet 1

  visualization_msgs::MarkerArray ma_;
  ros::Publisher marker_array_pub_;
  marker_array_pub_ = nh_.advertise<visualization_msgs::MarkerArray>("just_marker_array", 10);

Code snippet 2

//slice = plane
for (int actualslice = 0; actualslice < numofslices; actualslice++)
{
  ...

  ma_.markers.resize(actualslice + 1);
  ma_.markers[actualslice].header.frame_id = "/map";
  ma_.markers[actualslice].header.stamp = ros::Time::now();
  ma_.markers[actualslice].ns = "slices";
  ma_.markers[actualslice].id = actualslice;
  ma_.markers[actualslice].type = visualization_msgs::Marker::TRIANGLE_LIST;
  ma_.markers[actualslice].action = visualization_msgs::Marker::ADD;
  ma_.markers[actualslice].lifetime = ros::Duration(1);
  ma_.markers[actualslice].pose.position.x = 0.0;
  ma_.markers[actualslice].pose.position.y = 0.0;
  ma_.markers[actualslice].pose.position.z = 0.0;
  ma_.markers[actualslice].pose.orientation.x = 0.0;
  ma_.markers[actualslice].pose.orientation.y = 0.0;
  ma_.markers[actualslice].pose.orientation.z = 0.0;
  ma_.markers[actualslice].pose.orientation.w = 1.0;
  ma_.markers[actualslice].scale.x = 1.0;
  ma_.markers[actualslice].scale.y = 1.0;
  ma_.markers[actualslice].scale.z = 1.0;
  ma_.markers[actualslice].color.r = 1.0;
  ma_.markers[actualslice].color.g = 0.0;
  ma_.markers[actualslice].color.b = 0.0;
  ma_.markers[actualslice].color.a = 1.0;

  //pointsVector3d contains all points of the actual plane
  // e.g. pointsVector3d.size() = 141
  // that means that the actual plane consists of 47 triangles (141/3)
  for(int i = 0; i < pointsVector3d.size(); i++)
  {
    ma_.markers[actualslice].points.push_back(pointsVector3d.at(i));
  }
}

Code snippet 3

    marker_array_pub_.publish(ma_);