Class SoPointSet

  • All Implemented Interfaces:
    SafeDisposable
    Direct Known Subclasses:
    SoMarkerSet

    public class SoPointSet
    extends SoNonIndexedShape
    Point set shape node. This node represents a set of points located at the coordinates specified by the vertexProperty field (from SoVertexShape) or the current inherited coordinates. For optimal performance, the vertexProperty field is recommended.

    SoPointSet uses the coordinates in order, starting with the coordinate at startIndex. The number of coordinates to use (the number of points in the set) is specified by the numPoints field. The default value of this field is -1, which means to use all the coordinates, so it may not be necessary to explicitly set this field.

    The coordinates of the point set are transformed by the current cumulative transformation.

    Lighting is not applied to points (i.e., they are rendered with light model BASE_COLOR) unless the application explicitly sets normal vectors using SoVertexProperty or SoNormal. Note that this is specific to direct rendering of point sets. If you render polygonal geometry, e.g. SoFaceSet, in POINTS mode (SoDrawStyle), normal vectors are computed by Open Inventor and lighting is enabled.

    NOTE: If you want to apply lighting in a shader, you still need to explicitly set normal vectors, otherwise lighting will be disabled for the point set.

    Point size is controlled by the SoDrawStyle field pointSize.

    Automatic simplification (by skipping points) is controlled by the SoComplexity field value. Only values < 0.5 have any effect.

    Treatment of the current material and normal binding is as follows: PER_PART, PER_FACE, and PER_VERTEX bindings bind one material or normal to each point. The default material binding is OVERALL. The default normal binding is PER_VERTEX.

    By default OpenGL renders points as "squares". To get round points (points rendered as circles) you must explicitly enable point smoothing, using the setSmoothing() method in the SoGLRenderAction class. You can get the current render action object from the viewer (or from the SoSceneManager if you are not using a viewer).

    Shape Antialiasing type is SoShape.POINTS.

    Limitations:

    • By default, SoPointSet ignores the vertex ordering set on the state by SoShapeHints nodes in order to avoid a performance hit on some GeForce cards. However, this default behavior can be changed using the environment variable OIV_POINT_SET_USE_VERTEX_ORDERING (see SoPreferences).

    File format/default:

    PointSet {

      vertexProperty NULL
      startIndex 0
      numPoints -1
    }

    Action behavior:

    SoGLRenderAction
    Draws points based on the current coordinates, normals, materials, drawing style, and so on.

    SoRayPickAction
    Picks points based on the current coordinates and transformation. Details about the intersection are returned in an SoPointDetail.

    SoGetBoundingBoxAction
    Computes the bounding box that encloses all points in the set with the current transformation applied to them. Sets the center to the average of the coordinates of all points.

    SoCallbackAction
    If any point callbacks are registered with the action, they will be invoked for each point in the set.

    See Also:
    SoCoordinate3, SoDrawStyle, SoFullSceneAntialiasing, SoIndexedPointSet, SoPointDetail, SoVertexProperty
    • Field Detail

      • numPoints

        public final SoSFInt32 numPoints
        Number of points.
    • Constructor Detail

      • SoPointSet

        public SoPointSet()
        Creates a point set node with default settings.