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.Dd June 23, 2006
.Dt SG 3
.Os
.ds vT FreeSG API Reference
.ds oS FreeSG 1.0
.Sh NAME
.Nm SG
.Nd FreeSG 3D scene graph
.Sh SYNOPSIS
.Bd -literal
#include <agar/core.h>
#include <freesg/sg.h>
.Ed
.Sh DESCRIPTION
The
.Nm
object is a general-purpose scene-graph, or a collection of nodes (i.e.,
.Xr SG_Node 3
objects) organized in a tree structure.
The
.Ft SG_Node
object is used to describe both "group" nodes and "leaf" nodes.
.Pp
Scene-graphs are usually rendered using the
.Xr SG_View 3
widget (or a subclass of it).
.Sh INHERITANCE HIERARCHY
.Xr AG_Object 3 ->
.Nm .
.Sh INITIALIZATION
.nr nS 1
.Ft "SG *"
.Fn SG_New "void *parent" "const char *name" "Uint flags"
.Pp
.nr nS 0
The
.Fn SG_New
function allocates, initializes, and attaches a
.Nm
object.
Acceptable
.Fa flags
options include:
.Pp
.Bl -tag -width "SG_SKIP_UNKNOWN_NODES "
.It SG_OVERLAY_WIREFRAME
Overlay wireframe onto geometric objects when rendering scene.
.It SG_OVERLAY_VERTICES
Overlay vertices onto geometric objects when rendering scene.
.It SG_OVERLAY_VNORMALS
Overlay vertex normals when rendering scene.
.It SG_OVERLAY_FNORMALS
Overlay facet normals when rendering scene.
.It SG_SKIP_UNKNOWN_NODES
When loading the contents of a scene, ignore unknown/unimplemented
elements (otherwise, encountering an unknown node will make the load
operation fail).
.El
.Sh EXAMPLES
See
.Pa demos/sgview
in the FreeSG source distribution.
.Sh SEE ALSO
.Xr SG_Intro 3 ,
.Xr M_Plane 3 ,
.Xr M_Real 3 ,
.Xr M_Matrix 3 ,
.Xr M_Vector 3
.Sh HISTORY
The
.Nm
object first appeared in FreeSG 1.0.