public class SoFaceSet extends SoNonIndexedShape
vertexProperty
field (from SoVertexShape
), or the current inherited state. For optimal performance, the vertexProperty
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, an SoFaceSet
with a numVertices
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 the numVertices
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 the numVertices
field to 0, 1 or 2. To render lines or points, use SoLineSet
or SoPointSet
respectively.
SoFaceSet
is a general purpose polygon rendering node. It can render triangles, quadrilaterals, and other types of polygons or any combination thereof. However:
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 an SoShapeHints
node. In this mode SoFaceSet
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 the SoShapeHints.windingType
field is equal to NO_WINDING_TYPE, SoFaceSet
defines a set of faces. It uses the coordinates in order, starting with startIndex
. Each face has a number of vertices specified by a value in the numVertices
field. For example, an SoFaceSet
with numVertices
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 the numVertices
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 a SoShapeHints.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 the numVertices
field. For example, an SoFaceSet
with numVertices
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 the numVertices
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 of SoVertexProperty
. Diffuse color, transparency and other color parameters used in the lighting equation may be specified using SoMaterial
.
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 of SoShapeHints
. You can also enable "two sided lighting" using SoShapeHints
.
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 using SoVertexProperty
or SoTextureCoordinate2
. 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:
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 an SoFaceDetail
.
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.
See also:
SoCoordinate3
, SoDrawStyle
, SoFaceDetail
, SoFullSceneAntialiasing
, SoIndexedFaceSet
, SoShapeHints
, SoTriangleSet
, SoVertexProperty
SoShape.ShapeTypes
SoNode.RenderModes
Inventor.ConstructorCommand
Modifier and Type | Field and Description |
---|---|
SoMFInt32 |
numVertices
Number of vertices per face or per contour.
|
startIndex
vertexProperty
boundingBoxIgnoring
VERBOSE_LEVEL, ZeroHandle
Constructor and Description |
---|
SoFaceSet()
Creates a face set node with default settings.
|
getNormalCache, getTangentCache
getShapeType, isPrimitiveRestartAvailable, isPrimitiveRestartAvailable
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
copyFieldValues, copyFieldValues, enableNotify, fieldsAreEqual, get, getAllFields, getEventIn, getEventOut, getField, getFieldName, hasDefaultValues, isNotifyEnabled, set, setToDefaults
dispose, getName, isDisposable, isSynchronizable, setName, setSynchronizable
getNativeResourceHandle
public final SoMFInt32 numVertices
Generated on July 31, 2019, Copyright © Thermo Fisher Scientific. All rights reserved. http://www.openinventor.com