SGL Class Hierarchy

The class hierarchy is as follows (indentation indicates subclassing):

sglObject - name, user data, reference counting

sglNode - bounding sphere, parent list

sglGroup - interior nodes with child list

sglBillboard - a transform node that rotates to face viewer
sglCallback - performs a user defined callback during some phase of traversal
sglDiscriminator - prune a traversal based on a bitmask test
sglLayer - ordered rendering for coplanar polygons without rendering artifacts
sglLOD - select a child based on range from the viewer
sglDistanceSwitch - select all or no children based on range from the viewer (a simplified version of sglLOD)
sglLODStateNode - affect the LOD range calculation (bias and offset) for all sglLOD and sglDistanceSwitch nodes below this one in the tree
sglOrderedGroup - ensures the order in which the children are rendered.
sglScene - root of a scenegraph (traversals must begin here?)
sglSwitch - select a none, one or all children for further traversal
sglBitMaskSwitch - select a none, one or any subset of up to 32 children for further traversal

sglIndexedBitMaskSwitch - with an index select one of an array of subsets of (up to 32) children for further traversal

sglAnimation - abstract base class for all animation nodes

sglKeyFrameAnimation - animation class where transitions are based on the number of frames that have elapsed
sglTimedAnimation - animation class where transitions are based on amount of time elapsed

sglScale - an SP or DP uniform scale node
sglTranslate - an SP or DP translate node
sglTransform - an SP or DP transform node

sglSpericalTransform -

sgluSpericalTransform -

sglDefaultStateNode - specify default statelets for all sglDrawable objects below (only affects those leaf nodes that do not explicitly specify that statelet, and can be "overridden" by subsequent sglDefaultStateNodes in the sub-tree below).
sglOverrideStateNode - specify override values for the statelets contained within (only overridden by ancestor sglOverrideStateNode nodes in the graph *ABOVE*).
sglUnProject - a node that transforms the current view matrix so that objects below will appear on the near clip plane.
sglUnScale - a node that transforms the current view matrix such that objects below are scaled to appear the same size no matter how far in front of the near clip plane they are.

sglGeode - a leaf node that consists of a number of sglDrawable objects
sglLight - abstract base class for all types of lights (defines the color components)

sglDirectionalLight - defines an "inifinite" light (parallel light rays from a specified direction).
sglPositionalLight - defines a "local?" light at a specified position with optional attenuation.

sglSpotLight - a positional light with spot light parameters (direction, cutoff and exponent).
sglLightPoint - (future) currently in the proposal phase

sglViewPlatform - leaf node whose origin indicates the position and orientation of an sglCamera (the view point)

sglCamera - abstract base class for all camera types, it encapsulates the specification of the view frustum used for culling and rendering

sglOrthographicCamera - specifies an orthographic viewing volume
sglPerspectiveCamera - specifies a perspective viewing volume (frustum).

sglDrawable - abstract base class that enforces a pure virtual draw function (all things that get selected for drawing by the cull traversal must be subclassed from this); stores state (sglStatelets); an axis-aligned bounding box; a parent sglGeode list

sglTextSet - contains a string to be rendered as a bitmap (using sglBitmapFont).
sglTexturedTextSet - contains a string to be rendered as a texture on a polygon face (using sglTextureFont).
sglInterleavedGeometry - one big array for all components (vertices, colors, normal, and/or texcoords).
sglGeoSet - base class for all non-interleaved geometry specifications which contains separate arrays for vertex, color, normal, and texcoord arrays.

sglPointSet -
sglLineSet -
sglTriangleSet -
sglQuadSet -
sglGeoStripSet -

sglLineStripSet -
sglTriangleFanSet -
sglTriangleStripSet -
sglQuadStripSet -
sglPolygonSet -

sglIndexedGeoSet - includes four separate indices into the vertex, color, normal, and texcoord arrays.

sglIndexedPointSet -
sglIndexedLineSet -
sglIndexedTriangleSet -
sglIndexedQuadSet -
sglIndexedGeoStripSet -

sglIndexedLineStripSet -
sglIndexedTriangleFanSet -
sglIndexedTriangleStripSet -
sglIndexedQuadStripSet -
sglIndexedPolygonSet -

sglMonoIndexedGeoSet - includes a single index into the vertex, color, normal, and texcoord arrays.

sglMonoIndexedPointSet -
sglMonoIndexedLineSet -
sglMonoIndexedTriangleSet -
sglMonoIndexedQuadSet -
sglMonoIndexedGeoStripSet -

sglMonoIndexedLineStripSet -
sglMonoIndexedTriangleFanSet -
sglMonoIndexedTriangleStripSet -
sglMonoIndexedQuadStripSet -
sglMonoIndexedPolygonSet -

sglBezierCurveSet -
sglBezierSurfaceSet -

sglStatelet - base class for elements of OpenGL state that is used to affect the appearance of an sglDrawable

sglBooleanStatelet - base class for all statelets that are either on or off

sglAntiAliasLine
sglAntiAliasPoint
sglAntiAliasPolygon
sglDepthMask
sglDithering
sglHighlight
sglLighting
sglTransparency

sglAlphaTest - set the glAlphaFunc parameters
sglBlending - set the glBlendFunc parameters
sglColorMask
sglCullMode - off, front, back, or "front and back" face culling
sglDepthRange
sglDepthSort
sglDepthTest
sglFog - define the fog properties
sglFrontFace
sglLineStipple - define the line stipple pattern
sglLineWidth - define the width of lines
sglLogicOp
sglMaterial - define the material properties
sglOcclusionCull - enable occlusion culling (where supported)
sglPointParameters -
sglPointSize - define the point radius
sglPolygonOffset - define the scale and offset for depth buffer adjustments
sglPolygonStipple - define the polygon stipple pattern.
sglPolyStyle - define for point, line or fill modes

sglPolyFrontStyle
sglPolyBackStyle

sglShadeModel
sglMultiTextureStatelet - support multitexturing
sglTexturingStatelet - abstract base class for texture related statelets that could be applied to separate texturing units

sglTexture - define the texture properties

sglTexture1D - 1D textures
sglTexture2D - 2D textures
sglTextureCubeMap - Cube map textures

sglTexEnv - part of the sglTexture configuration (decal/modulate, blend colors)
sglTexGen - part of the sglTexture configuration (automatic texcoord generation configuration)
sglTextureMatrix - push a new matrix on the texture matrix stack

sglTransformationStatelet - only used internally to sort on matrix pushes

sglLODState - affect the range calculation in an sglLOD node (this should become an sglStatelet)

A number of classes are used in the traversal and state sorting processing:

sglRangeObject - used for transparency sorting

sglOcclusionObject - used for occlusion sorting

sglTraversalState - the actual traverser; contains a vector of statelets defining the complete OpenGL state

sglStatsTraversalState - same as above, but with statistics collection

sglFullState - a complete vector of all statelets defining a complete OpenGL state
sglCurrState - the current vector of statelets (during traversal)
sglDrawablePool - base class for user defined state sorting mechanism

sglUnsortedDrawablePool - traversals without state sorting.
sglSortedDrawablePool - with state sorting

sglObjPool - pool of objects used during sorting
sglView - a convenience class for fast prototyping (encapsulates a basic traversal functionality).

Classes used in the intersect and pick traversals:

sglProbe - contains the intersect and probe specific enums

sglIntersect - maintains the traversal state for intersect (was sglSegSet)
sglPick (future) - maintains the traversal state for pick

A number of geometric math classes are also used (most are templated for SP and DP versions):

sglVec2
sglVec3
sglVec4
sglMat2
sglMat3
sglMat4
sglPlane
sglPolytope - a set of planes

sglFrustum - a six-sided polytope generated from orthographic or perspective view parameters

sglSphereBound - bounding sphere
sglBoxBound - bounding box
sglSegment - a directed segment (mainly for intersect traversals)
sglBitmapFont - for use with the sglText node

sglBitmapFontGLUT - wrapper for bitmap fonts in the GLUT library
sglBitmapFontGLX - wrapper for bitmap fonts built into GLX (X windows only)
sglBitmapFontWGL - wrapper for bitmap fonts built into Windoze (Micro$oft Windoze only).

sglTextureFont - for use with the sglTexturedText node.