public class SoVolumeFaceSet extends SoFaceSet
SoVolumeData node and the 3D shape formed by constructing faces (polygons) from vertices located at the coordinates specified in the vertexProperty field (from SoVertexShape) or the current inherited state. For optimal performance, use of the vertexProperty field is recommended.
The shape defined by this intersection is textured using the data from the current SoVolumeData node and SoTransferFunction node. The interpolation field controls how the texture is interpolated. Texture coordinates are automatically computed for each vertex based on its position relative to the 3D extent of the volume. If texture coordinates are specified, they are ignored.
This node can be used to create custom "slices" through the volume, for example a cylinder slice. It can be considered a generalization of the SoOrthoSlice, SoObliqueSlice, SoFenceSlice, etc features. But note:
SoOrthoSlice), the rendering may be slightly different due to positioning and interpolation.
SoOrthoSlice) have "two-sided lighting" enabled by default as a convenience. This is not true for volume geometry nodes (which have the same default as their corresponding standard geometry node), so the "back" side of the geometry will not be lighted unless you enable two-sided lighting using an SoShapeHints node.
When set to false, the clipGeometry field allows rendering of the portion of the geometry that does not intersect the volume data. This portion is not textured and is rendered as a regular SoFaceSet.
This node uses 3D texturing and is not available if the hardware does not support this feature.
SoVolumeFaceSet uses the coordinates in order, starting with the first one. Each face has a number of vertices specified by a value in the numVertices field. For example, an SoVolumeFaceSet 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. For improved performance, arrange all the faces with only 3 vertices at the beginning of the list, then all faces with 4 vertices, and finally all other faces.
The number of values in the numVertices field indicates the number of faces in the set.
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.
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 have provided 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. If no normals are specified, they will be generated automatically.
Notes:
A face set may render or pick incorrectly if any of its polygons are self-intersecting or non-planar. The volume size and orientation (like geometry) can be modified by transformation nodes in the scene graph and this in turn modifies the appearance of volume rendering nodes like SoVolumeFaceSet. However the same transformation must be applied to the volume data node and all volume rendering nodes associated with that volume. So effectively any transformation nodes that affect the volume must be placed before the volume data node. For performance concerns, an instance of SoVolumeFaceSet should not be used multiple times in the scene graph. In order to have the best trade-off between performances and memory footprint use a single SoVertexProperty node shared by several instances of SoVolumeFaceSet.
File format/default:
VolumeFaceSet {
| vertexProperty | NULL |
| startIndex | 0 |
| numVertices | -1 |
| clipGeometry | true |
| offset | 0 |
| interpolation | LINEAR |
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:
SoVolumeData, SoTransferFunction, SoROI, SoCoordinate3, SoDrawStyle, SoVolumeIndexedFaceSet, SoVolumeIndexedTriangleStripSet, SoVolumeTriangleStripSet, SoFaceDetail, SoVertexProperty
| Modifier and Type | Class and Description |
|---|---|
static class |
SoVolumeFaceSet.Interpolations
Deprecated.
|
SoShape.ShapeTypesInventor.ConstructorCommand| Modifier and Type | Field and Description |
|---|---|
SoSFBool |
clipGeometry
Specifies to clip the geometry at the volume boundaries.
|
SoSFEnum<SoVolumeShape.Interpolations> |
interpolation
Interpolation mode.
|
static int |
LINEAR
Deprecated.
Use
SoVolumeFaceSet.Interpolations.LINEAR instead. |
static int |
NEAREST
Deprecated.
Use
SoVolumeFaceSet.Interpolations.NEAREST instead. |
SoSFFloat |
offset
Sets an offset value used for computing the texture coordinates.
|
SoSFBool |
useVbo
Deprecated.
As of Open Inventor 8500 See documentation for more details
|
numVerticesstartIndexvertexPropertyboundingBoxIgnoring, LINES, POINTS, POLYGONS, TEXTVERBOSE_LEVEL, ZeroHandle| Constructor and Description |
|---|
SoVolumeFaceSet()
Constructor.
|
getNormalCachegetShapeType, isPrimitiveRestartAvailable, isPrimitiveRestartAvailableaffectsState, callback, copy, copy, distribute, doAction, getAlternateRep, getBoundingBox, getByName, getMatrix, getPrimitiveCount, getRenderUnitID, GLRender, GLRenderBelowPath, GLRenderInPath, GLRenderOffPath, grabEventsCleanup, grabEventsSetup, handleEvent, isBoundingBoxIgnoring, isOverride, pick, rayPick, search, setOverride, touch, writecopyFieldValues, copyFieldValues, enableNotify, fieldsAreEqual, get, getAllFields, getEventIn, getEventOut, getField, getFieldName, hasDefaultValues, isNotifyEnabled, set, setToDefaultsdispose, getEXTERNPROTO, getName, getPROTO, isDisposable, isSynchronizable, setName, setSynchronizablegetAddress, getNativeResourceHandle, startInternalThreads, stopInternalThreads@Deprecated public static final int NEAREST
SoVolumeFaceSet.Interpolations.NEAREST instead.@Deprecated public static final int LINEAR
SoVolumeFaceSet.Interpolations.LINEAR instead.public final SoSFBool clipGeometry
SoROI node also affects the clipping process. Default is true.public final SoSFFloat offset
public final SoSFEnum<SoVolumeShape.Interpolations> interpolation
@Deprecated public final SoSFBool useVbo
SoShapeHints.useVBO field to enable or disable use of Vextex Buffer Objects for rendering. Generated on January 23, 2025, Copyright © Thermo Fisher Scientific. All rights reserved. http://www.openinventor.com