SoShapeHints(3IV)
SoShapeHints (SoShapeHints) - node that provides hints about shapes
As shipped in IRIX 6.5.30. Added in IRIX 6.5.22.
NAME SoShapeHints (SoShapeHints) - node that provides hints about shapes INHERITS FROM SoBase > SoFieldContainer > SoNode > SoShapeHints SYNOPSIS #include <Inventor_c/nodes/SoShapeHints.h> enum SoShapeHintsVertexOrdering { UNKNOWN_ORDERING Ordering of vertices is unknown CLOCKWISE Face vertices are ordered clockwise (from the outside) COUNTERCLOCKWISE Face vertices are ordered counterclockwise (from the outside) } enum SoShapeHintsShapeType { UNKNOWN_SHAPE_TYPE Nothing is known about the shape SOLID The shape encloses a volume } enum SoShapeHintsFaceType { UNKNOWN_FACE_TYPE Nothing is known about faces CONVEX All faces are convex } Fields from class SoShapeHints: SoSFEnum vertexOrdering SoSFEnum shapeType SoSFEnum faceType SoSFFloat creaseAngle Functions from class SoShapeHints: SoShapeHints * SoShapeHintsCreate() SoType SoShapeHintsGetClassTypeId() Functions from class SoNode: void SoShapeHintsSetOverride(SoShapeHints *this, SbBool state) SbBool SoShapeHintsIsOverride(const SoShapeHints *this) SoNode * SoShapeHintsCopy(const SoShapeHints *this, SbBool copyConnections = FALSE) SbBool SoShapeHintsAffectsState(const SoShapeHints *this) SoNode * SoShapeHintsGetByName(const char *name) int SoShapeHintsGetByNameList(const char *name, SoNodeList *list) Functions from class SoFieldContainer: void SoShapeHintsSetToDflts(SoShapeHints *this) SbBool SoShapeHintsHasDfltVals(const SoShapeHints *this) SbBool SoShapeHintsFldsAreEq(const SoShapeHints *this, const SoFieldContainer *fc) void SoShapeHintsCopyFieldVals(SoShapeHints *this, const SoFieldContainer *fc, SbBool copyConnections = FALSE) SbBool SoShapeHintsSet(SoShapeHints *this, const char *fieldDataString) void SoShapeHintsGet(SoShapeHints *this, SbString *fieldDataString) int SoShapeHintsGetFields(const SoShapeHints *this, SoFieldList *resultList) SoField * SoShapeHintsGetField(const SoShapeHints *this, const char *fieldName) SbBool SoShapeHintsGetFieldName(const SoShapeHints *this, const SoField *field, SbName *fieldName) SbBool SoShapeHintsIsNotifyEnabled(const SoShapeHints *this) SbBool SoShapeHintsEnableNotify(SoShapeHints *this, SbBool flag) Functions from class SoBase: void SoShapeHintsRef(SoShapeHints *this) void SoShapeHintsUnref(const SoShapeHints *this) void SoShapeHintsUnrefNoDelete(const SoShapeHints *this) void SoShapeHintsTouch(SoShapeHints *this) SoType SoShapeHintsGetTypeId(const SoShapeHints *this) SbBool SoShapeHintsIsOfType(const SoShapeHints *this, SoType type) void SoShapeHintsSetName(SoShapeHints *this, const char *name) SbName SoShapeHintsGetName(const SoShapeHints *this) DESCRIPTION By default, Inventor assumes very little about the shapes it renders. You can use the SoShapeHints node to indicate that vertex-based shapes (those derived from SoVertexShape) are solid, contain ordered vertices, or contain convex faces. For fastest rendering, specify SOLID, COUNTERCLOCKWISE, CONVEX shapes. These hints allow Inventor to optimize certain rendering features. Optimizations that may be performed include enabling back-face culling and disabling two-sided lighting. For example, if an object is solid and has ordered vertices, Inventor turns on backface culling and turns off two-sided lighting. If the object is not solid but has ordered vertices, it turns off backface culling and turns on two-sided lighting. In all other cases, both backface culling and two-sided lighting are off. The SoShapeHints node also affects how default normals are generated. When a node derived from SoVertexShape has to generate default normals, it uses the creaseAngle field to determine which edges should be smooth- shaded and which ones should have a sharp crease. The crease angle is the angle between surface normals on adjacent polygons. For example, a crease angle of .5 radians means that an edge between two adjacent polygonal faces will be smooth shaded if the normals to the two faces form an angle that is less than .5 radians (about 30 degrees). Otherwise, it will be faceted. Normal generation is fastest when the creaseAngle is 0 (the default), producing one normal per facet. A creaseAngle of pi produces one averaged normal per vertex. FIELDS SoSFEnum vertexOrdering Indicates how the vertices of faces are ordered. CLOCKWISE ordering means that the vertices of each face form a clockwise loop around the face, when viewed from the outside (the side toward which the normal points). SoSFEnum shapeType Indicates whether the shape is known to enclose a volume (SOLID) or not. If the inside (the side away from the surface normal) of any part of the shape is visible, the shape is not solid. SoSFEnum faceType Indicates whether each face is convex. Because the penalty for non- convex faces is very steep (faces must be triangulated expensively), the default assumes all faces are convex. Therefore, shapes with concave faces may not be displayed correctly unless this hint is set to UNKNOWN_FACE_TYPE. SoSFFloat creaseAngle Indicates the minimum angle (in radians) between two adjacent face normals required to form a sharp crease at the edge when default normals are computed and used. FUNCTIONS SoShapeHints * SoShapeHintsCreate() Creates a shape hints node with default settings. SoType SoShapeHintsGetClassTypeId() Returns type identifier for this class. ACTION BEHAVIOR SoGLRenderAction, SoCallbackAction, SoRayPickAction, SoGetBoundingBoxAction Sets the state to contain the hints; sets up optimizations based on the hints. FILE FORMAT/DEFAULTS ShapeHints { vertexOrdering UNKNOWN_ORDERING shapeType UNKNOWN_SHAPE_TYPE faceType CONVEX creaseAngle 0 } SEE ALSO SoVertexShape