Open CASCADE Technology
7.2.0
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BVHTreeSelector class provides a possibility to store parameters of view volume, such as its vertices and equations, and contains methods detecting if given AABB overlaps view volume. More...
#include <OpenGl_BVHTreeSelector.hxx>
Public Member Functions | |
OpenGl_BVHTreeSelector () | |
Creates an empty selector object with parallel projection type by default. More... | |
void | SetViewVolume (const Handle< Graphic3d_Camera > &theCamera) |
Retrieves view volume's planes equations and its vertices from projection and world-view matrices. More... | |
void | SetViewportSize (const Standard_Integer theViewportWidth, const Standard_Integer theViewportHeight) |
Standard_Boolean | Intersect (const OpenGl_Vec3d &theMinPt, const OpenGl_Vec3d &theMaxPt) const |
Detects if AABB overlaps view volume using separating axis theorem (SAT). More... | |
void | CacheClipPtsProjections () |
Caches view volume's vertices projections along its normals and AABBs dimensions. Must be called at the beginning of each BVH tree traverse loop. More... | |
const Handle< Graphic3d_Camera > & | Camera () const |
Return the camera definition. More... | |
const OpenGl_Mat4d & | ProjectionMatrix () const |
Returns current projection matrix. More... | |
const OpenGl_Mat4d & | WorldViewMatrix () const |
Returns current world view transformation matrix. More... | |
Standard_Integer | ViewportWidth () const |
Standard_Integer | ViewportHeight () const |
const Graphic3d_WorldViewProjState & | WorldViewProjState () const |
Returns state of current world view projection transformation matrices. More... | |
Protected Types | |
enum | { Plane_Top, Plane_Bottom, Plane_Left, Plane_Right, Plane_Near, Plane_Far, PlanesNB } |
Enumerates planes of view volume. More... | |
enum | { ClipVert_LeftTopNear, ClipVert_LeftBottomNear, ClipVert_RightTopNear, ClipVert_RightBottomNear, ClipVert_LeftTopFar, ClipVert_LeftBottomFar, ClipVert_RightTopFar, ClipVert_RightBottomFar, ClipVerticesNB } |
Enumerates vertices of view volume. More... | |
Protected Member Functions | |
Standard_Real | SignedPlanePointDistance (const OpenGl_Vec4d &theNormal, const OpenGl_Vec4d &thePnt) |
Calculates signed distance from plane to point. More... | |
Protected Attributes | |
OpenGl_Vec4d | myClipPlanes [PlanesNB] |
Plane equations. More... | |
OpenGl_Vec4d | myClipVerts [ClipVerticesNB] |
Vertices. More... | |
Handle< Graphic3d_Camera > | myCamera |
camera definition More... | |
Standard_Real | myMaxClipProjectionPts [PlanesNB] |
Max view volume's vertices projections onto its normals. More... | |
Standard_Real | myMinClipProjectionPts [PlanesNB] |
Min view volume's vertices projections onto its normals. More... | |
Standard_Real | myMaxOrthoProjectionPts [3] |
Max view volume's vertices projections onto normalized dimensions of AABB. More... | |
Standard_Real | myMinOrthoProjectionPts [3] |
Min view volume's vertices projections onto normalized dimensions of AABB. More... | |
Standard_Boolean | myIsProjectionParallel |
OpenGl_Mat4d | myProjectionMat |
OpenGl_Mat4d | myWorldViewMat |
Standard_Integer | myViewportWidth |
Standard_Integer | myViewportHeight |
Graphic3d_WorldViewProjState | myWorldViewProjState |
State of world view projection matrices. More... | |
BVHTreeSelector class provides a possibility to store parameters of view volume, such as its vertices and equations, and contains methods detecting if given AABB overlaps view volume.
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OpenGl_BVHTreeSelector::OpenGl_BVHTreeSelector | ( | ) |
Creates an empty selector object with parallel projection type by default.
void OpenGl_BVHTreeSelector::CacheClipPtsProjections | ( | ) |
Caches view volume's vertices projections along its normals and AABBs dimensions. Must be called at the beginning of each BVH tree traverse loop.
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Return the camera definition.
Standard_Boolean OpenGl_BVHTreeSelector::Intersect | ( | const OpenGl_Vec3d & | theMinPt, |
const OpenGl_Vec3d & | theMaxPt | ||
) | const |
Detects if AABB overlaps view volume using separating axis theorem (SAT).
theMinPt | [in] maximum point of AABB. |
theMaxPt | [in] minimum point of AABB. |
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Returns current projection matrix.
void OpenGl_BVHTreeSelector::SetViewportSize | ( | const Standard_Integer | theViewportWidth, |
const Standard_Integer | theViewportHeight | ||
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void OpenGl_BVHTreeSelector::SetViewVolume | ( | const Handle< Graphic3d_Camera > & | theCamera | ) |
Retrieves view volume's planes equations and its vertices from projection and world-view matrices.
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Calculates signed distance from plane to point.
theNormal | [in] the plane's normal. |
thePnt | [in] |
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Returns current world view transformation matrix.
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Returns state of current world view projection transformation matrices.
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camera definition
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Plane equations.
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Vertices.
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Max view volume's vertices projections onto its normals.
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Max view volume's vertices projections onto normalized dimensions of AABB.
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Min view volume's vertices projections onto its normals.
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Min view volume's vertices projections onto normalized dimensions of AABB.
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State of world view projection matrices.