495 lines
13 KiB
C++
495 lines
13 KiB
C++
#include <osg/GL>
|
|
#include <osg/Camera>
|
|
#include <osg/Types>
|
|
#include <osg/Notify>
|
|
#include <osg/State>
|
|
|
|
using namespace osg;
|
|
|
|
Camera::Camera(DisplaySettings* ds)
|
|
{
|
|
|
|
_adjustAspectRatioMode = ADJUST_HORIZONTAL;
|
|
|
|
// projection details.
|
|
|
|
float fovy = 45.0f;
|
|
if (ds)
|
|
{
|
|
fovy = 2.0f*RadiansToDegrees(atan(ds->getScreenHeight()*0.5/ds->getScreenDistance()));
|
|
}
|
|
|
|
setPerspective(fovy,1.0,1.0,1000.0);
|
|
|
|
// look at details.
|
|
_lookAtType =USE_HOME_POSITON;
|
|
|
|
_eye.set(0.0f,0.0f,0.0f);
|
|
_center.set(0.0f,0.0f,-1.0f);
|
|
_up.set(0.0f,1.0f,0.0f);
|
|
|
|
_attachedTransformMode = NO_ATTACHED_TRANSFORM;
|
|
|
|
if (ds) _screenDistance = ds->getScreenDistance();
|
|
else _screenDistance = 0.33f;
|
|
|
|
_fusionDistanceMode = PROPORTIONAL_TO_LOOK_DISTANCE;
|
|
_fusionDistanceRatio = 1.0f;
|
|
}
|
|
|
|
Camera::Camera(const Camera& camera):Referenced()
|
|
{
|
|
copy(camera);
|
|
}
|
|
|
|
Camera& Camera::operator=(const Camera& camera)
|
|
{
|
|
if (&camera==this) return *this;
|
|
|
|
copy(camera);
|
|
|
|
return *this;
|
|
}
|
|
|
|
void Camera::copy(const Camera& camera)
|
|
{
|
|
_projectionType = camera._projectionType;
|
|
|
|
// how the window dimensions should be altered during a window resize.
|
|
_adjustAspectRatioMode = camera._adjustAspectRatioMode;
|
|
|
|
// note, in Frustum/Perspective mode these values are scaled
|
|
// by the zNear from when they were initialised to ensure that
|
|
// subsequent changes in zNear do not affect them.
|
|
_left = camera._left;
|
|
_right = camera._right;
|
|
_bottom = camera._bottom;
|
|
_top = camera._top;
|
|
|
|
_zNear = camera._zNear;
|
|
_zFar = camera._zFar;
|
|
|
|
|
|
// look at details.
|
|
_lookAtType = camera._lookAtType;
|
|
|
|
_eye = camera._eye;
|
|
_center = camera._center;
|
|
_up = camera._up;
|
|
|
|
_attachedTransformMode = camera._attachedTransformMode;
|
|
_eyeToModelTransform = camera._eyeToModelTransform;
|
|
_modelToEyeTransform = camera._modelToEyeTransform;
|
|
|
|
_screenDistance = camera._screenDistance;
|
|
_fusionDistanceMode = camera._fusionDistanceMode;
|
|
_fusionDistanceRatio = camera._fusionDistanceRatio;
|
|
|
|
}
|
|
|
|
Camera::~Camera()
|
|
{
|
|
}
|
|
|
|
|
|
|
|
/** Set a orthographics projection. See glOrtho for further details.*/
|
|
void Camera::setOrtho(double left, double right,
|
|
double bottom, double top,
|
|
double zNear, double zFar)
|
|
{
|
|
_projectionType = ORTHO;
|
|
_left = left;
|
|
_right = right;
|
|
_bottom = bottom;
|
|
_top = top;
|
|
_zNear = zNear;
|
|
_zFar = zFar;
|
|
}
|
|
|
|
|
|
/** Set a 2D orthographics projection. See gluOrtho2D for further details.*/
|
|
void Camera::setOrtho2D(double left, double right,
|
|
double bottom, double top)
|
|
{
|
|
_projectionType = ORTHO2D;
|
|
_left = left;
|
|
_right = right;
|
|
_bottom = bottom;
|
|
_top = top;
|
|
_zNear = -1.0;
|
|
_zFar = 1.0;
|
|
}
|
|
|
|
|
|
/** Set a perspective projection. See glFrustum for further details.*/
|
|
void Camera::setFrustum(double left, double right,
|
|
double bottom, double top,
|
|
double zNear, double zFar)
|
|
{
|
|
_projectionType = FRUSTUM;
|
|
// note, in Frustum/Perspective mode these values are scaled
|
|
// by the zNear from when they were initialised to ensure that
|
|
// subsequent changes in zNear do not affect them.
|
|
_left = left;
|
|
_right = right;
|
|
_bottom = bottom;
|
|
_top = top;
|
|
_zNear = zNear;
|
|
_zFar = zFar;
|
|
}
|
|
|
|
|
|
|
|
/** Set a sysmetical perspective projection, See gluPerspective for further details.*/
|
|
void Camera::setPerspective(double fovy,double aspectRatio,
|
|
double zNear, double zFar)
|
|
{
|
|
_projectionType = PERSPECTIVE;
|
|
|
|
// note, in Frustum/Perspective mode these values are scaled
|
|
// by the zNear from when they were initialised to ensure that
|
|
// subsequent changes in zNear do not affect them.
|
|
|
|
// calculate the appropriate left, right etc.
|
|
double tan_fovy = tan(DegreesToRadians(fovy*0.5));
|
|
_right = tan_fovy * aspectRatio * zNear;
|
|
_left = -_right;
|
|
_top = tan_fovy * zNear;
|
|
_bottom = -_top;
|
|
|
|
_zNear = zNear;
|
|
_zFar = zFar;
|
|
}
|
|
|
|
/** Set a sysmetical perspective projection using field of view.*/
|
|
void Camera::setFOV(double fovx,double fovy,
|
|
double zNear, double zFar)
|
|
{
|
|
_projectionType = PERSPECTIVE;
|
|
|
|
// note, in Frustum/Perspective mode these values are scaled
|
|
// by the zNear from when they were initialised to ensure that
|
|
// subsequent changes in zNear do not affect them.
|
|
|
|
// calculate the appropriate left, right etc.
|
|
double tan_fovx = tan(DegreesToRadians(fovx*0.5));
|
|
double tan_fovy = tan(DegreesToRadians(fovy*0.5));
|
|
_right = tan_fovx * zNear;
|
|
_left = -_right;
|
|
_top = tan_fovy * zNear;
|
|
_bottom = -_top;
|
|
|
|
_zNear = zNear;
|
|
_zFar = zFar;
|
|
}
|
|
|
|
/** Set the near and far clipping planes.*/
|
|
void Camera::setNearFar(double zNear, double zFar)
|
|
{
|
|
if (_projectionType==FRUSTUM || _projectionType==PERSPECTIVE)
|
|
{
|
|
double adjustRatio = zNear/_zNear;
|
|
|
|
_left *= adjustRatio;
|
|
_right *= adjustRatio;
|
|
_bottom *= adjustRatio;
|
|
_top *= adjustRatio;
|
|
}
|
|
|
|
_zNear = zNear;
|
|
_zFar = zFar;
|
|
|
|
if (_projectionType==ORTHO2D)
|
|
{
|
|
if (_zNear!=-1.0 || _zFar!=1.0) _projectionType = ORTHO;
|
|
}
|
|
}
|
|
|
|
/** Adjust the clipping planes to account for a new window aspcect ratio.
|
|
* Typicall used after resizeing a window.*/
|
|
void Camera::adjustAspectRatio(double newAspectRatio, AdjustAspectRatioMode aa)
|
|
{
|
|
if (newAspectRatio<0.01f || newAspectRatio>100.0f)
|
|
{
|
|
notify(NOTICE)<<"Warning: aspect ratio out of range (0.01..100) in Camera::adjustAspectRatio("<<newAspectRatio<<","<<aa<<")"<<std::endl;
|
|
return;
|
|
}
|
|
|
|
if(aa != ADJUST_NONE) // If adjustment todo
|
|
{
|
|
double previousAspectRatio = (_right-_left)/(_top-_bottom);
|
|
double deltaRatio = newAspectRatio/previousAspectRatio;
|
|
if (aa == ADJUST_HORIZONTAL)
|
|
{
|
|
_left *= deltaRatio;
|
|
_right *= deltaRatio;
|
|
}
|
|
else // aa == ADJUST_VERTICAL
|
|
{
|
|
_bottom /= deltaRatio;
|
|
_top /= deltaRatio;
|
|
}
|
|
}
|
|
}
|
|
|
|
/** Calculate and return the equivilant fovx for the current project setting.
|
|
* This value is only valid for when a symetric persepctive projection exists.
|
|
* i.e. getProjectionType()==PERSPECTIVE.*/
|
|
double Camera::calc_fovy() const
|
|
{
|
|
// note, _right & _left are prescaled by znear so
|
|
// no need to account for it.
|
|
return RadiansToDegrees(atan(_top/_zNear)-atan(_bottom/_zNear));
|
|
}
|
|
|
|
|
|
/** Calculate and return the equivilant fovy for the current project setting.
|
|
* This value is only valid for when a symetric persepctive projection exists.
|
|
* i.e. getProjectionType()==PERSPECTIVE.*/
|
|
double Camera::calc_fovx() const
|
|
{
|
|
// note, _right & _left are prescaled by znear so
|
|
// no need to account for it.
|
|
return RadiansToDegrees(atan(_right/_zNear)-atan(_left/_zNear));
|
|
}
|
|
|
|
|
|
/** Calculate and return the projection aspect ratio.*/
|
|
double Camera::calc_aspectRatio() const
|
|
{
|
|
double delta_x = _right-_left;
|
|
double delta_y = _top-_bottom;
|
|
return delta_x/delta_y;
|
|
}
|
|
|
|
Matrix Camera::getProjectionMatrix() const
|
|
{
|
|
// set up the projection matrix.
|
|
switch(_projectionType)
|
|
{
|
|
case(ORTHO):
|
|
case(ORTHO2D):
|
|
{
|
|
return Matrix::ortho(_left,_right,_bottom,_top,_zNear,_zFar);
|
|
}
|
|
break;
|
|
case(FRUSTUM):
|
|
case(PERSPECTIVE):
|
|
{
|
|
return Matrix::frustum(_left,_right,_bottom,_top,_zNear,_zFar);
|
|
}
|
|
break;
|
|
|
|
}
|
|
|
|
// shouldn't get here if camera is set up properly.
|
|
// return identity.
|
|
return Matrix();
|
|
}
|
|
|
|
void Camera::home()
|
|
{
|
|
// OpenGL default position.
|
|
_lookAtType = USE_HOME_POSITON;
|
|
_eye.set(0.0f,0.0f,0.0f);
|
|
_center.set(0.0f,0.0f,-1.0f);
|
|
_up.set(0.0f,1.0f,0.0f);
|
|
}
|
|
|
|
void Camera::setView(const Vec3& eyePoint, const Vec3& lookPoint, const Vec3& upVector)
|
|
{
|
|
setLookAt(eyePoint,lookPoint,upVector);
|
|
}
|
|
|
|
|
|
void Camera::setLookAt(const Vec3& eye,
|
|
const Vec3& center,
|
|
const Vec3& up)
|
|
{
|
|
_lookAtType = USE_EYE_CENTER_AND_UP;
|
|
_eye = eye;
|
|
_center = center;
|
|
_up = up;
|
|
|
|
ensureOrthogonalUpVector();
|
|
}
|
|
|
|
|
|
void Camera::setLookAt(double eyeX, double eyeY, double eyeZ,
|
|
double centerX, double centerY, double centerZ,
|
|
double upX, double upY, double upZ)
|
|
{
|
|
_lookAtType = USE_EYE_CENTER_AND_UP;
|
|
_eye.set(eyeX,eyeY,eyeZ);
|
|
_center.set(centerX,centerY,centerZ);
|
|
_up.set(upX,upY,upZ);
|
|
|
|
ensureOrthogonalUpVector();
|
|
}
|
|
|
|
|
|
/** post multiple the existing eye point and orientation by matrix.
|
|
* note, does not affect any ModelTransforms that are applied.*/
|
|
void Camera::transformLookAt(const Matrix& matrix)
|
|
{
|
|
_up = (_up+_eye)*matrix;
|
|
_eye = _eye*matrix;
|
|
_center = _center*matrix;
|
|
_up -= _eye;
|
|
_up.normalize();
|
|
|
|
_lookAtType=USE_EYE_CENTER_AND_UP;
|
|
}
|
|
|
|
Vec3 Camera::getLookVector() const
|
|
{
|
|
osg::Vec3 lv(_center-_eye);
|
|
lv.normalize();
|
|
return lv;
|
|
}
|
|
|
|
Vec3 Camera::getSideVector() const
|
|
{
|
|
osg::Vec3 lv(_center-_eye);
|
|
lv.normalize();
|
|
osg::Vec3 sv(lv^_up);
|
|
sv.normalize();
|
|
return sv;
|
|
}
|
|
|
|
|
|
void Camera::attachTransform(TransformMode mode, Matrix* matrix)
|
|
{
|
|
switch(mode)
|
|
{
|
|
case(EYE_TO_MODEL):
|
|
{
|
|
_eyeToModelTransform = matrix;
|
|
if (_eyeToModelTransform.valid())
|
|
{
|
|
_attachedTransformMode = mode;
|
|
if (!_modelToEyeTransform.valid()) _modelToEyeTransform = osgNew Matrix;
|
|
if (!_modelToEyeTransform->invert(*_eyeToModelTransform))
|
|
{
|
|
notify(WARN)<<"Warning: Camera::attachTransform() failed to invert _modelToEyeTransform"<<std::endl;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
_attachedTransformMode = NO_ATTACHED_TRANSFORM;
|
|
_modelToEyeTransform = NULL;
|
|
}
|
|
}
|
|
break;
|
|
case(MODEL_TO_EYE):
|
|
{
|
|
_modelToEyeTransform = matrix;
|
|
if (_modelToEyeTransform.valid())
|
|
{
|
|
_attachedTransformMode = mode;
|
|
if (!_eyeToModelTransform.valid()) _eyeToModelTransform = osgNew Matrix;
|
|
if (!_eyeToModelTransform->invert(*_modelToEyeTransform))
|
|
{
|
|
notify(WARN)<<"Warning: Camera::attachTransform() failed to invert _modelToEyeTransform"<<std::endl;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
_attachedTransformMode = NO_ATTACHED_TRANSFORM;
|
|
_eyeToModelTransform = NULL;
|
|
}
|
|
}
|
|
break;
|
|
case(NO_ATTACHED_TRANSFORM):
|
|
_attachedTransformMode = NO_ATTACHED_TRANSFORM;
|
|
_eyeToModelTransform = NULL;
|
|
_modelToEyeTransform = NULL;
|
|
break;
|
|
default:
|
|
_attachedTransformMode = NO_ATTACHED_TRANSFORM;
|
|
notify(WARN)<<"Warning: invalid TransformMode pass to osg::Camera::attachTransform(..)"<<std::endl;
|
|
notify(WARN)<<" setting Camera to NO_ATTACHED_TRANSFORM."<<std::endl;
|
|
break;
|
|
}
|
|
}
|
|
|
|
Matrix* Camera::getTransform(TransformMode mode)
|
|
{
|
|
switch(mode)
|
|
{
|
|
case(EYE_TO_MODEL): return _eyeToModelTransform.get();
|
|
case(MODEL_TO_EYE): return _modelToEyeTransform.get();
|
|
default: return NULL;
|
|
}
|
|
}
|
|
|
|
const Matrix* Camera::getTransform(TransformMode mode) const
|
|
{
|
|
switch(mode)
|
|
{
|
|
case(EYE_TO_MODEL): return _eyeToModelTransform.get();
|
|
case(MODEL_TO_EYE): return _modelToEyeTransform.get();
|
|
default: return NULL;
|
|
}
|
|
}
|
|
|
|
|
|
Matrix Camera::getModelViewMatrix() const
|
|
{
|
|
Matrix modelViewMatrix;
|
|
|
|
// set up the model view matrix.
|
|
switch(_lookAtType)
|
|
{
|
|
case(USE_HOME_POSITON):
|
|
{
|
|
if (_eyeToModelTransform.valid())
|
|
modelViewMatrix.invert(*_eyeToModelTransform);
|
|
else if (_modelToEyeTransform.valid())
|
|
modelViewMatrix = *_modelToEyeTransform;
|
|
else
|
|
modelViewMatrix.makeIdentity();
|
|
}
|
|
break;
|
|
case(USE_EYE_AND_QUATERNION): // not implemented yet, default to eye,center,up.
|
|
case(USE_EYE_CENTER_AND_UP):
|
|
default:
|
|
{
|
|
if (_eyeToModelTransform.valid())
|
|
{
|
|
modelViewMatrix.invert(*_eyeToModelTransform);
|
|
modelViewMatrix.postMult(Matrix::lookAt(_eye,_center,_up));
|
|
}
|
|
else if (_modelToEyeTransform.valid())
|
|
{
|
|
modelViewMatrix.makeLookAt(_eye,_center,_up);
|
|
modelViewMatrix.preMult(*_modelToEyeTransform);
|
|
}
|
|
else
|
|
modelViewMatrix.makeLookAt(_eye,_center,_up);
|
|
|
|
}
|
|
break;
|
|
}
|
|
return modelViewMatrix;
|
|
}
|
|
|
|
float Camera::getFusionDistance() const
|
|
{
|
|
switch(_fusionDistanceMode)
|
|
{
|
|
case(PROPORTIONAL_TO_SCREEN_DISTANCE): return _screenDistance*_fusionDistanceRatio;
|
|
case(PROPORTIONAL_TO_LOOK_DISTANCE):
|
|
default: return getLookDistance()*_fusionDistanceRatio;
|
|
}
|
|
}
|
|
|
|
void Camera::ensureOrthogonalUpVector()
|
|
{
|
|
Vec3 lv = _center-_eye;
|
|
Vec3 sv = lv^_up;
|
|
_up = sv^lv;
|
|
_up.normalize();
|
|
}
|