Class SoIndexedPointSet

  • All Implemented Interfaces:
    SafeDisposable
    Direct Known Subclasses:
    SoIndexedMarkerSet

    public class SoIndexedPointSet
    extends SoIndexedShape
    Indexed 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.

    Each point consists of one vertex, which is denoted by an integer index (from the coordIndex field) into the current coordinates. The number of values in the coordIndex field defines the number of points. Depending on the current material and normal binding values, the materials and normals for the vertices may be accessed in order or indexed. If they are indexed, the materialIndex and normalIndex fields are used.

    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:

    • The OpenGL VBO (vertex buffer object) rendering model only allows one set of indices for a primitive. Therefore it is not possible to use VBO rendering (and performance may be lower) if indices are set in the materialIndex, normalIndex or textureCoordIndex fields.

    File format/default:

    IndexedPointSet {

      vertexProperty NULL
      coordIndex -1
      materialIndex -1
      normalIndex -1
      textureCoordIndex -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 vertices of the point 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 successive point in the set.

    See Also:
    SoCoordinate3, SoDrawStyle, SoFullSceneAntialiasing, SoPointDetail, SoPointSet, SoVertexProperty
    • Constructor Detail

      • SoIndexedPointSet

        public SoIndexedPointSet()
        Creates an indexed point set node with default settings.