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| |
| #include "qssgrenderclippingfrustum_p.h" |
| |
| #include <QtQuick3DUtils/private/qssgutils_p.h> |
| |
| QT_BEGIN_NAMESPACE |
| |
| QSSGClippingFrustum::QSSGClippingFrustum(const QMatrix4x4 &modelviewprojection, const QSSGClipPlane &nearPlane) |
| { |
| QSSGClipPlane *_cullingPlanes = mPlanes; |
| const QMatrix4x4 &modelViewProjectionMat(modelviewprojection); |
| const float *modelviewProjection = modelViewProjectionMat.data(); |
| |
| // update planes (http://read.pudn.com/downloads128/doc/542641/Frustum.pdf) |
| // Google for Gribb plane extraction if that link doesn't work. |
| // http://www.google.com/search?q=ravensoft+plane+extraction |
| #define M(_x, _y) modelviewProjection[(4 * (_y)) + (_x)] |
| // left plane |
| _cullingPlanes[0].normal.setX(M(3, 0) + M(0, 0)); |
| _cullingPlanes[0].normal.setY(M(3, 1) + M(0, 1)); |
| _cullingPlanes[0].normal.setZ(M(3, 2) + M(0, 2)); |
| _cullingPlanes[0].d = M(3, 3) + M(0, 3); |
| _cullingPlanes[0].d /= vec3::normalize(_cullingPlanes[0].normal); |
| |
| // right plane |
| _cullingPlanes[1].normal.setX(M(3, 0) - M(0, 0)); |
| _cullingPlanes[1].normal.setY(M(3, 1) - M(0, 1)); |
| _cullingPlanes[1].normal.setZ(M(3, 2) - M(0, 2)); |
| _cullingPlanes[1].d = M(3, 3) - M(0, 3); |
| _cullingPlanes[1].d /= vec3::normalize(_cullingPlanes[1].normal); |
| |
| // far plane |
| _cullingPlanes[2].normal.setX(M(3, 0) - M(2, 0)); |
| _cullingPlanes[2].normal.setY(M(3, 1) - M(2, 1)); |
| _cullingPlanes[2].normal.setZ(M(3, 2) - M(2, 2)); |
| _cullingPlanes[2].d = M(3, 3) - M(2, 3); |
| _cullingPlanes[2].d /= vec3::normalize(_cullingPlanes[2].normal); |
| |
| // bottom plane |
| _cullingPlanes[3].normal.setX(M(3, 0) + M(1, 0)); |
| _cullingPlanes[3].normal.setY(M(3, 1) + M(1, 1)); |
| _cullingPlanes[3].normal.setZ(M(3, 2) + M(1, 2)); |
| _cullingPlanes[3].d = M(3, 3) + M(1, 3); |
| _cullingPlanes[3].d /= vec3::normalize(_cullingPlanes[3].normal); |
| |
| // top plane |
| _cullingPlanes[4].normal.setX(M(3, 0) - M(1, 0)); |
| _cullingPlanes[4].normal.setY(M(3, 1) - M(1, 1)); |
| _cullingPlanes[4].normal.setZ(M(3, 2) - M(1, 2)); |
| _cullingPlanes[4].d = M(3, 3) - M(1, 3); |
| _cullingPlanes[4].d /= vec3::normalize(_cullingPlanes[4].normal); |
| #undef M |
| _cullingPlanes[5] = nearPlane; |
| // http://www.openscenegraph.org/projects/osg/browser/OpenSceneGraph/trunk/include/osg/Plane?rev=5328 |
| // setup the edges of the plane that we will clip against an axis-aligned bounding box. |
| for (quint32 idx = 0; idx < 6; ++idx) |
| _cullingPlanes[idx].calculateBBoxEdges(); |
| } |
| |
| QT_END_NAMESPACE |