1d1dcf2cf3
and a new scheme for computing the scaling when using autoscale that introduces smooth transitions to the scaling of the subgraph so that it looks more natural.
270 lines
9.4 KiB
C++
270 lines
9.4 KiB
C++
/* -*-c++-*- OpenSceneGraph - Copyright (C) 1998-2006 Robert Osfield
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*
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* This library is open source and may be redistributed and/or modified under
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* the terms of the OpenSceneGraph Public License (OSGPL) version 0.0 or
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* (at your option) any later version. The full license is in LICENSE file
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* included with this distribution, and on the openscenegraph.org website.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* OpenSceneGraph Public License for more details.
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*/
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#include <osg/AutoTransform>
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#include <osg/CullStack>
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#include <osg/Notify>
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#include <osg/io_utils>
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using namespace osg;
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AutoTransform::AutoTransform():
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_autoUpdateEyeMovementTolerance(0.0f),
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_autoRotateMode(NO_ROTATION),
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_autoScaleToScreen(false),
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_scale(1.0f,1.0f,1.0f),
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_firstTimeToInitEyePoint(true),
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_minimumScale(0.0f),
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_maximumScale(FLT_MAX),
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_autoScaleTransitionWidthRatio(0.25f),
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_matrixDirty(true)
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{
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// setNumChildrenRequiringUpdateTraversal(1);
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}
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AutoTransform::AutoTransform(const AutoTransform& pat,const CopyOp& copyop):
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Transform(pat,copyop),
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_position(pat._position),
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_pivotPoint(pat._pivotPoint),
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_autoUpdateEyeMovementTolerance(pat._autoUpdateEyeMovementTolerance),
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_autoRotateMode(pat._autoRotateMode),
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_autoScaleToScreen(pat._autoScaleToScreen),
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_rotation(pat._rotation),
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_scale(pat._scale),
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_firstTimeToInitEyePoint(true),
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_minimumScale(pat._minimumScale),
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_maximumScale(pat._maximumScale),
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_autoScaleTransitionWidthRatio(pat._autoScaleTransitionWidthRatio),
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_matrixDirty(true)
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{
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// setNumChildrenRequiringUpdateTraversal(getNumChildrenRequiringUpdateTraversal()+1);
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}
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void AutoTransform::setScale(const Vec3& scale)
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{
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_scale = scale;
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if (_scale.x()<_minimumScale) _scale.x() = _minimumScale;
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if (_scale.y()<_minimumScale) _scale.y() = _minimumScale;
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if (_scale.z()<_minimumScale) _scale.z() = _minimumScale;
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if (_scale.x()>_maximumScale) _scale.x() = _maximumScale;
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if (_scale.y()>_maximumScale) _scale.y() = _maximumScale;
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if (_scale.z()>_maximumScale) _scale.z() = _maximumScale;
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_matrixDirty=true;
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dirtyBound();
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}
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bool AutoTransform::computeLocalToWorldMatrix(Matrix& matrix,NodeVisitor*) const
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{
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if (_matrixDirty) computeMatrix();
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if (_referenceFrame==RELATIVE_RF)
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{
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matrix.preMult(_cachedMatrix);
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}
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else // absolute
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{
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matrix = _cachedMatrix;
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}
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return true;
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}
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bool AutoTransform::computeWorldToLocalMatrix(Matrix& matrix,NodeVisitor*) const
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{
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if (_referenceFrame==RELATIVE_RF)
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{
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matrix.postMult(osg::Matrix::translate(-_position)*
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osg::Matrix::rotate(_rotation.inverse())*
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osg::Matrix::scale(1.0f/_scale.x(),1.0f/_scale.y(),1.0f/_scale.z())*
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osg::Matrix::translate(_pivotPoint));
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}
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else // absolute
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{
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matrix = osg::Matrix::translate(-_position)*
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osg::Matrix::rotate(_rotation.inverse())*
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osg::Matrix::scale(1.0f/_scale.x(),1.0f/_scale.y(),1.0f/_scale.z())*
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osg::Matrix::translate(_pivotPoint);
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}
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return true;
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}
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void AutoTransform::computeMatrix() const
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{
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if (!_matrixDirty) return;
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_cachedMatrix.set(osg::Matrix::translate(-_pivotPoint)*
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osg::Matrix::scale(_scale)*
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osg::Matrix::rotate(_rotation)*
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osg::Matrix::translate(_position));
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_matrixDirty = false;
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}
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void AutoTransform::accept(NodeVisitor& nv)
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{
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if (nv.validNodeMask(*this))
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{
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// if app traversal update the frame count.
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if (nv.getVisitorType()==NodeVisitor::UPDATE_VISITOR)
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{
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}
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else
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if (nv.getVisitorType()==NodeVisitor::CULL_VISITOR)
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{
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CullStack* cs = dynamic_cast<CullStack*>(&nv);
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if (cs)
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{
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Viewport::value_type width = _previousWidth;
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Viewport::value_type height = _previousHeight;
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osg::Viewport* viewport = cs->getViewport();
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if (viewport)
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{
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width = viewport->width();
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height = viewport->height();
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}
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osg::Vec3 eyePoint = cs->getEyeLocal();
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osg::Vec3 localUp = cs->getUpLocal();
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osg::Vec3 position = getPosition();
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const osg::Matrix& projection = *(cs->getProjectionMatrix());
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bool doUpdate = _firstTimeToInitEyePoint;
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if (!_firstTimeToInitEyePoint)
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{
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osg::Vec3 dv = _previousEyePoint-eyePoint;
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if (dv.length2()>getAutoUpdateEyeMovementTolerance()*(eyePoint-getPosition()).length2())
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{
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doUpdate = true;
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}
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osg::Vec3 dupv = _previousLocalUp-localUp;
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// rotating the camera only affects ROTATE_TO_*
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if (_autoRotateMode &&
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dupv.length2()>getAutoUpdateEyeMovementTolerance())
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{
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doUpdate = true;
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}
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else if (width!=_previousWidth || height!=_previousHeight)
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{
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doUpdate = true;
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}
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else if (projection != _previousProjection)
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{
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doUpdate = true;
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}
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else if (position != _previousPosition)
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{
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doUpdate = true;
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}
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}
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_firstTimeToInitEyePoint = false;
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if (doUpdate)
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{
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if (getAutoScaleToScreen())
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{
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float size = 1.0f/cs->pixelSize(getPosition(),0.48f);
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if (_autoScaleTransitionWidthRatio>0.0f)
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{
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if (_minimumScale>0.0f)
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{
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float j = _minimumScale;
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float i = (_maximumScale<FLT_MAX) ?
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_minimumScale+(_maximumScale-_minimumScale)*_autoScaleTransitionWidthRatio :
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_minimumScale*(1.0f+_autoScaleTransitionWidthRatio);
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float c = 1.0f/(4.0f*(i-j));
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float b = 1.0f - 2.0f*c*i;
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float a = j + b*b / (4.0f*c);
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float k = -b / (2.0f*c);
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if (size<k) size = _minimumScale;
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else if (size<i) size = a + b*size + c*(size*size);
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}
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if (_maximumScale<FLT_MAX)
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{
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float n = _maximumScale;
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float m = (_minimumScale>0.0) ?
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_maximumScale+(_minimumScale-_maximumScale)*_autoScaleTransitionWidthRatio :
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_maximumScale*(1.0f-_autoScaleTransitionWidthRatio);
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float c = 1.0f / (4.0f*(m-n));
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float b = 1.0f - 2.0f*c*m;
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float a = n + b*b/(4.0f*c);
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float p = -b / (2.0f*c);
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if (size>p) size = _maximumScale;
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else if (size>m) size = a + b*size + c*(size*size);
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}
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}
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setScale(size);
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}
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if (_autoRotateMode==ROTATE_TO_SCREEN)
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{
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osg::Vec3d translation;
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osg::Quat rotation;
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osg::Vec3d scale;
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osg::Quat so;
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cs->getModelViewMatrix()->decompose( translation, rotation, scale, so );
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setRotation(rotation.inverse());
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}
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else if (_autoRotateMode==ROTATE_TO_CAMERA)
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{
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osg::Vec3 PosToEye = _position - eyePoint;
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osg::Matrix lookto = osg::Matrix::lookAt(
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osg::Vec3(0,0,0), PosToEye, localUp);
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Quat q;
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q.set(osg::Matrix::inverse(lookto));
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setRotation(q);
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}
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_previousEyePoint = eyePoint;
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_previousLocalUp = localUp;
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_previousWidth = width;
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_previousHeight = height;
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_previousProjection = projection;
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_previousPosition = position;
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_matrixDirty = true;
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}
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}
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}
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// now do the proper accept
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Transform::accept(nv);
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}
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}
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BoundingSphere AutoTransform::computeBound() const
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{
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BoundingSphere bsphere;
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if ( getAutoScaleToScreen() && _firstTimeToInitEyePoint )
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return bsphere;
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bsphere = Transform::computeBound();
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return bsphere;
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}
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