86 lines
1.9 KiB
C++
86 lines
1.9 KiB
C++
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#include "osg/GL"
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#include <osg/Camera>
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using namespace osg;
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Camera::Camera()
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{
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_fovy = 60.0;
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_aspectRatio = 1.0;
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home();
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}
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Camera::~Camera()
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{
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}
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void Camera::home()
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{
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_eyePoint.set(0.0f,0.0f,0.0f);
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_lookPoint.set(0.0f,0.0f,-1.0f);
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_upVector.set(0.0f,1.0f,0.0f);
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_nearPlane = 1.0;
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_farPlane = 1000.0;
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}
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void Camera::setView(osg::Vec3 eyePoint, osg::Vec3 lookPoint, osg::Vec3 upVector)
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{
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// Should do some checking here!
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_eyePoint = eyePoint;
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_lookPoint = lookPoint;
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_upVector = upVector;
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}
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void Camera::draw_PROJECTION() const
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{
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glMatrixMode( GL_PROJECTION );
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glLoadIdentity();
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gluPerspective(_fovy, _aspectRatio, static_cast<GLdouble>(_nearPlane), static_cast<GLdouble>(_farPlane));
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glMatrixMode( GL_MODELVIEW );
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}
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void Camera::draw_MODELVIEW() const
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{
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glMatrixMode( GL_MODELVIEW );
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gluLookAt( _eyePoint.x(), _eyePoint.y(), _eyePoint.z(),
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_lookPoint.x(), _lookPoint.y(), _lookPoint.z(),
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_upVector.x(), _upVector.y(), _upVector.z());
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}
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void Camera::ensureOrthogonalUpVector()
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{
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Vec3 lv = _lookPoint-_eyePoint;
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Vec3 sv = lv^_upVector;
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_upVector = sv^lv;
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_upVector.normalize();
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}
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void Camera::mult(const Camera& camera,const Matrix& m)
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{
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// transform camera.
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_upVector = (camera._lookPoint+camera._upVector)*m;
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_eyePoint = camera._eyePoint*m;
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_lookPoint = camera._lookPoint*m;
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_upVector -= _lookPoint;
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// now reset up vector so it remains at 90 degrees to look vector,
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// as it may drift during transformation.
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ensureOrthogonalUpVector();
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}
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void Camera::mult(const Matrix& m,const Camera& camera)
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{
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// transform camera.
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_upVector = m*(camera._lookPoint+camera._upVector);
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_eyePoint = m*camera._eyePoint;
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_lookPoint = m*camera._lookPoint;
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_upVector -= _lookPoint;
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// now reset up vector so it remains at 90 degrees to look vector,
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// as it may drift during transformation.
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ensureOrthogonalUpVector();
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}
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