Bounding Box Collision Detection
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bbdetectcoll

bbdetectcoll is a library function which detects if bounding boxes of two objects collide.

package require SWU

bbdetectcoll objA_trnMatrixID objB_trnMatrixID objA_minVertexID objA_maxVertexID objB_minVertexID objB_maxVertexID

objA_trnMatrixID

Transformation matrix of object A.

objB_trnMatrixID

Transformation matrix of object B

objA_minVertexID

Coordinates of the lower vertex of the bounding box of the object A.

objA_maxVertexID

Coordinates of the upper vertex of the bounding box of the object A.

objB_minVertexID

Coordinates of the lower vertex of the bounding box of the object B.

objB_maxVertexID

Coordinates of the upper vertex of the bounding box of the object B.

Return Value

If the procedure succeeds then it returns 1 if the objects collide and 0 if they don't collide. Otherwise the procedure returns an error message (shown on the Tk console command line).

Side Effects

None.

Examples

set curScene [SAA_AllocScene]

Scene2

SAA_sceneGetCurrent $curScene

package require SW

1.0

set objectAID [SW_name2Element sphere1 $curScene]

Elem4

set objectBID [SW_name2Element sphere2 $curScene]

Elem6

set objA_trnMatrixID [SAA_AllocMatrix]

Matrix7

SAA_modelGetMatrix $curScene $objectAID $SAA_Constants(SAA_COORDSYS_GLOBAL) $objA_trnMatrixID

set objB_trnMatrixID [SAA_AllocMatrix]

Matrix8

SAA_modelGetMatrix $curScene $objectBID $SAA_Constants(SAA_COORDSYS_GLOBAL) $objB_trnMatrixID

SAA_modelGetBoundingBox $curScene $objectAID minX minY minZ maxX maxY maxZ

package require SWU

1.0

set objA_minVertexID [SWU_listToCArray [list $minX $minY $minZ] float]

FloatArray9

set objA_maxVertexID [SWU_listToCArray [list $maxX $maxY $maxZ] float]

FloatArray10

SAA_modelGetBoundingBox $curScene $objectBID minX minY minZ maxX maxY maxZ

set objB_minVertexID [SWU_listToCArray [list $minX $minY $minZ] float]

FloatArray11

set objB_maxVertexID [SWU_listToCArray [list $maxX $maxY $maxZ] float]

FloatArray12

bbdetectcoll $objA_trnMatrixID $objB_trnMatrixID $objA_minVertexID $objA_maxVertexID $objB_minVertexID $objB_maxVertexID

1

This retrieves transformation matrices and bounding boxes for sphere1 and sphere2 and detects if bounding boxes collide.

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