What are these constants (referencing ordinal numbers) for ?
Sketchup::RenderingOptions.constants
[:ROPAssign, :ROPSetRenderMode, :ROPSetTransparencyObsolete, :ROPSetTexture, :ROPSetEdgeDisplayMode, :ROPSetEdgeColorMode, :ROPSetJitterEdges, :ROPSetExtendEdges, :ROPSetProfileEdges, :ROPSetProfileWidth, :ROPSetFaceColorMode, :ROPSetDisplayInstanceAxes, :ROPSetBackgroundColor, :ROPSetForegroundColor, :ROPSetHighlightColor, :ROPSetConstructionColor, :ROPSetDisplayColorByLayer, :ROPSetExtendLines, :ROPSetLineExtension, :ROPSetDisplayFog, :ROPSetFogColor, :ROPSetFogDist, :ROPSetFogHint, :ROPSetSectionDisplayMode, :ROPDrawHidden, :ROPEditComponent, :ROPTransparencySortMethod, :ROPSetDepthQueEdges, :ROPSetLineEndEdges, :ROPSetDepthQueWidth, :ROPSetLineEndWidth, :ROPSetProfilesOnlyEdges, :ROPSetLockedColor, :ROPSetDisplaySketchAxes, :ROPSetFaceColor, :ROPSetEdgeType, :ROPSetModelTransparency, :ROPSetMaterialTransparency, :ROPSetSectionActiveColor, :ROPSetSectionInactiveColor, :ROPSetSectionDefaultCutColor, :ROPSetSectionCutWidth, :ROPSetHideConstructionGeometry, :ROPSetSkyColor, :ROPSetGroundColor, :ROPSetDrawHorizon, :ROPSetDrawGround, :ROPSetDrawUnderground, :ROPSetGroundTransparency, :ROPSetDisplayText, :ROPSetDisplayDims, :ROPSetFogUseBkColor]