BoundBox: TYPE = REF BoundBoxObj;
BoundBoxObj: TYPE = SVBoundBox.BoundBoxObj;
Camera: TYPE = DisplayList3d.Camera;
Color: TYPE = GraphicsColor.Color;
CoordSystem: TYPE = REF CoordSysObj;
CoordSysObj: TYPE = CoordSys.CoordSysObj;
Point2d: TYPE = SV2d.Point2d;
Point3d: TYPE = Matrix3d.Point3d;
Vector: TYPE = SVVector3d.Vector;
Surface: TYPE = CSG.Surface; -- REF ANY;
CSGTree: TYPE = REF CSGTreeObj;
CSGTreeObj: TYPE = CSG.CSGTreeObj;
maxSceneDepth: NAT = 20;
PointSetOp:
TYPE =
CSG.PointSetOp;
{union, intersection, difference}
ParameterArray: TYPE = CSG.ParameterArray; -- ARRAY [1..maxSceneDepth] OF REAL;
SurfaceArray: TYPE = REF SurfaceArrayObj;
SurfaceArrayObj: TYPE = CSG.SurfaceArrayObj;
ARRAY [1..maxSurfacesPerObject] OF Surface;
InOutArray: TYPE = CSG.InOutArray; -- ARRAY [1..maxSceneDepth] OF BOOL;
NormalArray: TYPE = CSG.NormalArray; -- ARRAY [1..maxSceneDepth] OF Vector;
PrimitiveArray: TYPE = CSG.PrimitiveArray; -- ARRAY [1..maxSurfacesPerObject] OF Primitive;
Ray: TYPE = REF RayObj;
RayObj: TYPE = CSG.RayObj;
Classification: TYPE = REF ClassificationObj;
ClassificationObj: TYPE = CSG.ClassificationObj;
LightSourceList: TYPE = Shading.LightSourceList;
RayCast:
PROC [cameraPoint: Point2d, sceneRay: Ray, node:
REF
ANY, makeStream:
BOOL ←
FALSE, f:
IO.
STREAM ←
NIL, indent:
NAT ← 0]
RETURNS [class: Classification];
The main ray casting procedure. Scene Ray must be in WORLD coordinates before this procedure is called.
RayCastNoBBoxes:
PROC [sceneRay: Ray, node:
REF
ANY, makeStream:
BOOL ←
FALSE, f:
IO.
STREAM ←
NIL, indent:
NAT ← 0]
RETURNS [class: Classification];
Like RayCast but ignore any bounding boxes which were computed. This is useful if the ray does not originate from the screen (as for computing shadows). Of course, bounding spheres would be useful in this case.
HitsTree: PROC [worldRay: Ray, tree: CSGTree] RETURNS [BOOL];
Combine: PROC [leftClass, rightClass: Classification, op: PointSetOp] RETURNS [combinedClass: Classification];
SingleRay: PROC [x, y: INTEGER, tree: CSGTree, lightSources: LightSourceList, camera: Camera, makeStream: BOOL ← FALSE, f: IO.STREAM ← NIL] RETURNS [color: Color];
SingleRay2:
PROC [cameraPoint: Point2d, tree: CSGTree, lightSources: LightSourceList, camera: Camera, makeStream:
BOOL ←
FALSE, f:
IO.
STREAM ←
NIL]
RETURNS [class: Classification];
The client must be sure to call ReturnClassToPool[class] when he is done with it.
SetScanSize: PROC [height, width: NAT];
DrawTree:
PROC [dc: Graphics.Context, tree: CSGTree, lightSources: LightSourceList, camera: Camera, aisRope: Rope.
ROPE, bAndWOnly:
BOOL, resolution:
REAL, notify: NotifyOfProgressProc ← NoOpNotifyOfProgress, clientData:
REF
ANY ←
NIL, outStream:
IO.
STREAM];
DrawTree calls notify once before starting each line (row) of pixels.
NotifyOfProgressProc: TYPE = PROC [currentY, minX, minY, maxX, maxY: REAL, clientData: REF ANY ← NIL];
NoOpNotifyOfProgress: NotifyOfProgressProc;
Text: TYPE = REF READONLY TEXT;
GetClassFromPool: PROC RETURNS [class: Classification];
ReturnClassToPool: PROC [class: Classification];
MakeClassAMiss:
PROC [class: Classification];
Rearranges class to correspond to a complete miss.
GetRayFromPool: PROC RETURNS [ray: Ray];
ReturnRayToPool: PROC [ray: Ray];