IndexedTriangleFanSet
Overview
IndexedTriangleFanSet is a geometry node containing a Coordinate or CoordinateDouble node, and can also contain Color or ColorRGBA, Normal and TextureCoordinate nodes.
The IndexedTriangleFanSet node belongs to the Rendering component and requires at least level 3, its default container field is geometry. It is available from X3D version 3.0 or higher.
Hierarchy
1
2
3
4
+ X3DNode
+ X3DGeometryNode
+ X3DComposedGeometryNode
+ IndexedTriangleFanSet
Fields
SFNode [in, out] metadata NULL [X3DMetadataObject]
Information about this node can be contained in a MetadataBoolean, MetadataDouble, MetadataFloat, MetadataInteger, MetadataString or MetadataSet node.
Hint
MFInt32 [in] set_index [0,∞) or -1
index list specifies triangles by connecting Coordinate vertices, each individual fan separated by -1 sentinel value.
Hints
- First indexed coordinate in each sequence is fan center.
- This field is not accessType inputOutput since X3D browsers might use different underlying geometric representations for high-performance rendering, and so output events are not appropriate.
SFBool [ ] solid TRUE
Setting solid true means draw only one side of polygons (backface culling on), setting solid false means draw both sides of polygons (backface culling off).
Hints
- Mnemonic “this geometry is solid like a brick” (you don’t render the inside of a brick).
- If in doubt, use solid=’false’ for maximum visibility.
- AccessType relaxed to inputOutput in order to support animation and visualization.
Warning
- Default value true can completely hide geometry if viewed from wrong side!
SFBool [ ] ccw TRUE
ccw defines clockwise/counterclockwise ordering of vertex coordinates, which in turn defines front/back orientation of polygon normals according to Right-Hand Rule (RHR).
Hints
- A good debugging technique for problematic polygons is to try changing the value of ccw, which can reverse solid effects (single-sided backface culling) and normal-vector direction.
- Clockwise
Warning
- Consistent and correct ordering of left-handed or right-handed point sequences is important throughout the coord array of point values.
SFBool [ ] colorPerVertex TRUE
Whether Color or ColorRGBA values are applied to each point vertex (true) or to each polygon face (false).
Hint
Warnings
- The provided value of IndexedTriangleFanSet colorPerVertex field is ignored and always treated as true.
- If child Color or ColorRGBA node is not provided, then geometry is rendered using corresponding Appearance and material/texture values.
SFBool [ ] normalPerVertex TRUE
Whether Normal node vector values are applied to each point vertex (true) or to each polygon face (false).
Hint
- If no child Normal node is provided, the X3D browser shall automatically generate normals, using creaseAngle to determine smoothed shading across shared vertices.
MFInt32 [ ] index [ ] [0,∞) or -1
index list specifies triangles by connecting Coordinate vertices, each individual fan separated by -1 sentinel value.
Hint
- First indexed coordinate in each sequence is fan center.
MFNode [in, out] attrib [ ] [X3DVertexAttributeNode]
Single contained FloatVertexAttribute node that can specify list of per-vertex attribute information for programmable shaders.
Hint
SFNode [in, out] fogCoord NULL [FogCoordinate]
Single contained FogCoordinate node that can specify depth parameters for fog in corresponding geometry.
SFNode [in, out] color NULL [X3DColorNode]
Single contained Color or ColorRGBA node that can specify color values applied to corresponding vertices according to colorIndex and colorPerVertex fields.
SFNode [in, out] texCoord NULL [X3DTextureCoordinateNode]
Single contained TextureCoordinate, TextureCoordinateGenerator or MultiTextureCoordinate node that can specify coordinates for texture mapping onto corresponding geometry.
SFNode [in, out] tangent NULL [Tangent] non standard
Input/Output field tangent. If there is no Tangent node, the MikkTSpace algorithm is used to generate tangent vectors.
SFNode [in, out] normal NULL [X3DNormalNode]
Single contained Normal node that can specify perpendicular vectors for corresponding vertices to support rendering computations, applied according to the normalPerVertex field.
Hint
- Useful for special effects. Normal vector computation by 3D graphics hardware is quite fast so adding normals to a scene is typically unnecessary.
Warning
- normal vectors increase file size, typically doubling geometry definitions. Normal vectors are rapidly computed at run time by GPUs and thus are rarely needed in model files if no special effects are expected.
SFNode [in, out] coord NULL [X3DCoordinateNode]
Single contained Coordinate or CoordinateDouble node that can specify a list of vertex values.
Advice
Hints
- Color, normal and texCoord values are applied in the same order as coord values.
- Insert a Shape node before adding geometry or Appearance.
- For advanced extensibility, authors can substitute a type-matched ProtoInstance node (with correct containerField value) for contained node content.