Legacy Class Catalog

Class names and schemas below are values recorded in controlled files. They are wire identifiers, not Python implementation names. Public mappings refer to the data returned by skppy.

Class families

Wire classes	Public mapping	Key role
CVertex, CEdge, CEdgeUse, CLoop, CFace	Geometry classes in Entities	Shared topology and directed face boundaries
CCurve, CArcCurve	Curve, ArcCurve	Ordered edge ownership and circular parameters
CComponentDefinition, CComponentInstance, CGroup, CImage	Component/entity classes	Reusable geometry and placement
CMaterial, CTexture, CDib	Material, Texture	Appearance, physical scale, and image bytes
CLayer, CLayerGroup	Layer, LayerFolder	Visibility and ownership
CConstructionPoint, CConstructionLine, CSectionPlane	Construction classes	Guides and sections
CCamera, CSketchUpPage, CViewPage	Camera, Scene	View and saved-page state
CRenderingOptions, CShadowInfo, CSketchCS	Model metadata	Display, geolocation, and axes
CText, CDimensionLinear, CDimensionRadial, CSkFont	Annotation classes	Text, anchors, dimensions, and fonts
CAttributeNamed, CRelationshipMap	Dictionaries and relationships	Typed metadata and graph links
Style, line-style, watermark managers	Shared style classes	Named presentation resources

Manager objects normally collapse into their public collections; they are not duplicated as model objects.

SketchUp 8 version map

#	Class	Schema	#	Class	Schema
1	CArcCurve	1	29	CImage	1
2	CAttribute	0	30	CLayer	2
3	CAttributeContainer	0	31	CLayerManager	4
4	CAttributeNamed	1	32	CLoop	1
5	CBackgroundImage	10	33	CMaterial	12
6	CCamera	5	34	CMaterialManager	4
7	CComponent	11	35	CPageList	1
8	CComponentBehavior	5	36	CPolyline3d	0
9	CComponentDefinition	10	37	CRelationship	0
10	CComponentInstance	4	38	CRelationshipMap	0
11	CConstructionGeometry	0	39	CRenderingOptions	36
12	CConstructionLine	1	40	CSectionPlane	2
13	CConstructionPoint	0	41	CShadowInfo	7
14	CCurve	4	42	CSkFont	1
15	CDefinitionList	0	43	CSketchCS	0
16	CDib	3	44	CSketchUpModel	22
17	CDimension	1	45	CSketchUpPage	1
18	CDimensionLinear	6	46	CSkpStyle	1
19	CDimensionRadial	2	47	CSkpStyleManager	2
20	CDimensionStyle	4	48	CText	9
21	CDrawingElement	9	49	CTextStyle	5
22	CEdge	2	50	CTexture	6
23	CEdgeUse	1	51	CThumbnail	1
24	CEntity	3	52	CVertex	0
25	CFace	3	53	CViewPage	12
26	CFaceTextureCoords	4	54	CWatermark	1
27	CFontManager	0	55	CWatermarkManager	2
28	CGroup	1	56	End-Of-Version-Map	0

Schema differences, SketchUp 3–8

A dash means that the class is absent from the target’s version map.

Class	V3	V4	V5	V6	V7	V8
CAttribute	-	0	0	0	0	0
CAttributeContainer	-	0	0	0	0	0
CAttributeNamed	-	0	0	0	1	1
CBackgroundImage	-	-	-	1	9	10
CCamera	-	4	4	5	5	5
CComponentBehavior	3	4	4	4	5	5
CComponentInstance	3	3	4	4	4	4
CConstructionLine	0	1	1	1	1	1
CCurve	3	4	4	4	4	4
CDib	2	2	2	3	3	3
CDimension	0	0	0	1	1	1
CDimensionLinear	4	4	4	6	6	6
CDrawingElement	8	8	9	9	9	9
CEntity	2	3	3	3	3	3
CFaceTextureCoords	-	4	4	4	4	4
CLayer	1	2	2	2	2	2
CPageList	-	1	1	1	1	1
CRenderingOptions	22	25	28	32	35	36
CSkFont	0	0	0	1	1	1
CSketchUpModel	10	12	12	18	22	22
CSkpStyle	-	-	-	1	1	1
CSkpStyleManager	-	-	-	2	2	2
CTextStyle	4	4	4	5	5	5
CTexture	4	4	4	6	6	6
CThumbnail	0	1	1	1	1	1
CViewPage	6	9	9	11	11	12
CWatermarkManager	-	-	-	2	2	2

Explicit schema boundaries

Version-aware readers use the per-file map. Classes with a single confirmed layout accept only the schemas below and fail before consuming an unknown body.

Class	Accepted schemas
CBackgroundImage	10
CComponent	11
CComponentDefinition	10, 11
CComponentInstance	4, 6
CConstructionGeometry	0
CDefinitionList	0
CDimension	1
CDimensionLinear	6
CDimensionRadial	2
CFontManager	0
CPageList	1
CPolyline3d	0
CRelationshipMap	0
CSkpStyleManager	2
CText	9
CThumbnail	1
CWatermark	1
CWatermarkManager	2

Some newer applications write a later class tag while down-saving an older body. The archive tag still participates in object identity, but the file’s version map selects the body layout. Confirmed target-specific exceptions are documented in field layouts.