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-- File: Vrml_LOD.cdl
-- Created: Mon Feb 10 16:03:59 1997
-- Author: Alexander BRIVIN
-- <brivin@minox.nizhny.matra-dtv.fr>
---Copyright: Matra Datavision 1997
class LOD from Vrml inherits TShared from MMgt
---Purpose: defines a LOD (level of detailization) node of VRML specifying properties
-- of geometry and its appearance.
-- This group node is used to allow applications to switch between
-- various representations of objects automatically. The children of this
-- node typically represent the same object or objects at the varying
-- of Levels Of Detail (LOD), from highest detail to lowest.
--
-- The specified center point of the LOD is transformed by current
-- transformation into world space, and yhe distancefrom the transformed
-- center to the world-space eye point is calculated.
-- If thedistance is less than the first value in the ranges array,
-- than the first child of the LOD group is drawn. If between
-- the first and second values in the range array, the second child
-- is drawn, etc.
-- If there are N values in the range array, the LOD group should
-- have N+1 children.
-- Specifying too few children will result in the last child being
-- used repeatedly for the lowest lewels of detail; if too many children
-- are specified, the extra children w ll be ignored.
-- Each value in the ranges array should be greater than the previous
-- value, otherwise results are undefined.
uses
HArray1OfReal from TColStd,
Vec from gp
is
Create returns mutable LOD from Vrml;
Create ( aRange : HArray1OfReal from TColStd;
aCenter : Vec from gp )
returns mutable LOD from Vrml;
SetRange ( me : mutable; aRange : HArray1OfReal from TColStd );
Range ( me ) returns HArray1OfReal from TColStd;
SetCenter ( me : mutable; aCenter : Vec from gp );
Center ( me ) returns Vec from gp;
Print ( me; anOStream: in out OStream from Standard) returns OStream from Standard;
---C++: return &
fields
myRange : HArray1OfReal from TColStd; -- Distance ranges for LOD switching
myCenter : Vec from gp; -- Center for distance computation
myRangeFlag : Boolean from Standard;
end LOD;
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