Class SoFaceSet
- java.lang.Object
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- All Implemented Interfaces:
SafeDisposable
- Direct Known Subclasses:
SoVolumeFaceSet
public class SoFaceSet extends SoNonIndexedShape
Polygonal face shape node. This node represents a 3D shape formed by constructing faces (polygons) from vertices located at the coordinates specified in thevertexProperty
field (fromSoVertexShape
), or the current inherited state. For optimal performance, thevertexProperty
field is recommended.Coordinates are used in order, starting with
startIndex
(zero by default).If the first value in the
numVertices
field is -1 (the default), then all the coordinates (starting with startIndex) are rendered as a single face.Otherwise each face uses the number of vertices specified by a value in the
numVertices
field. For example, anSoFaceSet
with anumVertices
of [3,4,4] would use the first three coordinates for the first face, the next four coordinates for the second face, and the next four coordinates for the third face. Thus the number of values in thenumVertices
field indicates the number of faces in the set.SoFaceSet
should only be used to render faces with 3 or more vertices. Otherwise the result is undefined. For example, do not set values in thenumVertices
field to 0, 1 or 2. To render lines or points, useSoLineSet
orSoPointSet
respectively.SoFaceSet
is a general purpose polygon rendering node. It can render triangles, quadrilaterals, and other types of polygons or any combination thereof. However:- For best performance, arrange the faces with all triangles first, then all quadrilaterals, then general polygons.
- If the shape has only triangles, use
SoTriangleSet
instead (simpler and possibly faster).
SoFaceSet
supports both convex and non-convex polygons (unlike OpenGL). However polygons are assumed to be convex by default. Rendering non-convex polygons in this mode may produce incorrect results. Enable non-convex polygons using the faceType field of anSoShapeHints
node. In this modeSoFaceSet
will automatically convert non-convex polygons, if necessary, to faces that the hardware can handle.SoFaceSet
can also directly handle complex polygons with "holes" (interior boundaries). See the following paragraphs.If
SoShapeHints
is not used, or if theSoShapeHints.windingType
field is equal to NO_WINDING_TYPE,SoFaceSet
defines a set of faces. It uses the coordinates in order, starting withstartIndex
. Each face has a number of vertices specified by a value in thenumVertices
field. For example, anSoFaceSet
withnumVertices
of [3,4,4] would use coordinates 1, 2, and 3 for the first face, coordinates 4, 5, 6, and 7 for the second face, and coordinates 8, 9, 10, and 11 for the third. The number of values in thenumVertices
field indicates the number of faces in the set. The default value (-1) means to use all the coordinates to define a single face.If
SoShapeHints
is used with aSoShapeHints.windingType
field is different from NO_WINDING_TYPE,SoFaceSet
defines a complex (multi-contour) face. It uses the coordinates in order, starting with the first one. Each contour has a number of vertices specified by a value in thenumVertices
field. For example, anSoFaceSet
withnumVertices
of [3,4,4] would use coordinates 1, 2, and 3 for the first contour, coordinates 4, 5, 6, and 7 for the second contour, and coordinates 8, 9, 10, and 11 for the third. The number of values in thenumVertices
field indicates the number of contours in the complex face.The coordinates of the face set are transformed by the current cumulative transformation. The faces are drawn with the current light model and drawing style (
SoDrawStyle
). Diffuse color and opacity may be specified using the orderedRGBA field ofSoVertexProperty
. Diffuse color, transparency and other color parameters used in the lighting equation may be specified usingSoMaterial
.Treatment of the current material and normal binding is as follows: The PER_PART and PER_FACE bindings specify a material or normal for each face. The _INDEXED bindings are equivalent to their non-indexed counterparts. The default material binding is OVERALL. The default normal binding is PER_VERTEX.
If any normals (or materials) are specified, Open Inventor assumes you provide the correct number of them, as indicated by the binding. You will see unexpected results if you specify fewer normals (or materials) than the shape requires.
Lighting is enabled by default (see
SoLightModel
). If lighting is enabled, by default only the "front face" of polygons are lit (the back face will be black). Which side is the front face is determined by the normal vector, if specified, else by the ordering of the vertices and the vertexOrdering field ofSoShapeHints
. You can also enable "two sided lighting" usingSoShapeHints
.If lighting is enabled and no normals were specified, they will be computed automatically. The normal generator computes "facet" or "smooth" (or a combination) normal vectors depending on the creaseAngle field of
SoShapeHints
.Textures may be applied using (for example)
SoTexture2
. Texture coordinates may be supplied usingSoVertexProperty
orSoTextureCoordinate2
. If a texture is applied and no texture coordinates were specified, they will be computed automatically. By default the computed coordinates map the texture to the axis-aligned bounding box of the shape, with the texture S axis corresponding to the longest axis of the box.Warning: A face set may not render or pick correctly if any of its polygons are self-intersecting or non-planar.
Limitations:
- Due to limitations of the OpenGL VBO (vertex buffer object) rendering model, it is not possible to use VBO rendering (and performance may be lower) if either the normal binding or the material binding is set to either PER_PART(_INDEXED) or PER_FACE(_INDEXED).
File format/default:
FaceSet {
vertexProperty NULL startIndex 0 numVertices -1 Action behavior:
SoGLRenderAction
Draws faces based on the current coordinates, normals, materials, drawing style, and so on.SoRayPickAction
Picks faces based on the current coordinates and transformation. Details about the intersection are returned in anSoFaceDetail
.SoGetBoundingBoxAction
Computes the bounding box that encloses all vertices of the face set with the current transformation applied to them. Sets the center to the average of the coordinates of all vertices.SoCallbackAction
If any triangle callbacks are registered with the action, they will be invoked for each successive triangle generated from each face in the set.
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Nested Class Summary
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Nested classes/interfaces inherited from class com.openinventor.inventor.nodes.SoShape
SoShape.ShapeTypes
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Nested classes/interfaces inherited from class com.openinventor.inventor.nodes.SoNode
SoNode.RenderModes
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Nested classes/interfaces inherited from class com.openinventor.inventor.Inventor
Inventor.ConstructorCommand
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Field Summary
Fields Modifier and Type Field Description SoMFInt32
numVertices
Number of vertices per face or per contour.-
Fields inherited from class com.openinventor.inventor.nodes.SoNonIndexedShape
startIndex
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Fields inherited from class com.openinventor.inventor.nodes.SoVertexShape
vertexProperty
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Fields inherited from class com.openinventor.inventor.nodes.SoShape
boundingBoxIgnoring
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Fields inherited from class com.openinventor.inventor.Inventor
VERBOSE_LEVEL, ZeroHandle
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Constructor Summary
Constructors Constructor Description SoFaceSet()
Creates a face set node with default settings.
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Method Summary
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Methods inherited from class com.openinventor.inventor.nodes.SoVertexShape
getNormalCache, getTangentCache
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Methods inherited from class com.openinventor.inventor.nodes.SoShape
getShapeType, isPrimitiveRestartAvailable, isPrimitiveRestartAvailable
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Methods inherited from class com.openinventor.inventor.nodes.SoNode
affectsState, callback, copy, copy, distribute, doAction, getAlternateRep, getBoundingBox, getByName, getMatrix, getPrimitiveCount, getRenderEngineMode, getRenderUnitID, GLRender, GLRenderBelowPath, GLRenderInPath, GLRenderOffPath, grabEventsCleanup, grabEventsSetup, handleEvent, isBoundingBoxIgnoring, isOverride, pick, rayPick, search, setOverride, touch, write
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Methods inherited from class com.openinventor.inventor.fields.SoFieldContainer
copyFieldValues, copyFieldValues, enableNotify, fieldsAreEqual, get, getAllFields, getEventIn, getEventOut, getField, getFieldName, hasDefaultValues, isNotifyEnabled, set, setToDefaults
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Methods inherited from class com.openinventor.inventor.misc.SoBase
dispose, getName, isDisposable, isSynchronizable, setName, setSynchronizable
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Methods inherited from class com.openinventor.inventor.Inventor
getNativeResourceHandle
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Field Detail
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numVertices
public final SoMFInt32 numVertices
Number of vertices per face or per contour.
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