FGFS-4.1/OpenSceneGraph
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Reimplement the light direction controls so that they now work correctly with osgViewer::Viewer.

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Improved the computation of the light direction from non-dimensional mouse coords so that they now project onto a hemisphere making
the interaction more intuitive.
This commit is contained in:
Robert Osfield 2011-10-27 13:11:20 +00:00
parent 7bcfb3c130
commit 3a64805d20
1 changed files with 28 additions and 57 deletions
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85
src/osgPresentation/SlideEventHandler.cpp
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@ -503,83 +503,42 @@ public:
void apply(osg::Node& node)
{
if (node.getStateSet())
{
apply(*node.getStateSet());
}
traverse(node);
}
void apply(osg::LightSource& lightsource)
{
if (lightsource.getStateSet())
{
apply(*lightsource.getStateSet());
}
if (lightsource.getLight())
{
OSG_INFO<<"Adjusting light"<<std::endl;
osg::Light* light = lightsource.getLight();
float azim = _currentX*osg::PI;
float elevation = _currentY*osg::PI_2;
osg::Vec3 direction(sin(azim)*cos(elevation),sin(elevation),cos(azim)*cos(elevation));
if (lightsource.getReferenceFrame()==osg::LightSource::RELATIVE_RF)
{
OSG_INFO<<"Relative to absolute"<<std::endl;
apply( osg::Matrix::identity(), lightsource.getLight());
}
else
{
osg::Matrix matrix(osg::computeEyeToLocal(_viewMatrix,_nodePath));
OSG_INFO<<"ModelView"<<matrix<<std::endl;
//direction = osg::Matrixd::transform3x3(matrix,direction);
//direction.normalize();
//direction = direction*matrix;
//direction.normalize();
apply(osg::computeEyeToLocal(_viewMatrix,_nodePath), lightsource.getLight());
}
light->setPosition(osg::Vec4(direction,0.0f));
}
traverse(lightsource);
}
void apply(osg::StateSet& stateset)
void apply(const osg::Matrixd& matrix, osg::Light* light)
{
osg::TexEnvCombine* texenvcombine = dynamic_cast<osg::TexEnvCombine*>(stateset.getTextureAttribute(0,osg::StateAttribute::TEXENV));
if (texenvcombine)
{
apply(*texenvcombine);
}
}
void apply(osg::TexEnvCombine& texenv)
{
OSG_INFO<<"Adjusting tex env combine"<<std::endl;
// compute direction of light based on a projecting onto a hemi-sphere.
float sum_x2_y2 = _currentX*_currentX + _currentY*_currentY;
osg::Vec3 direction;
if (sum_x2_y2<1.0) direction.set(_currentX, _currentY, sqrtf(1.0-sum_x2_y2));
else direction.set(_currentX, _currentY, 0.0);
osg::Matrix matrix(osg::computeEyeToLocal(_viewMatrix,_nodePath));
direction.normalize();
OSG_INFO<<"ModelView"<<matrix<<std::endl;
float azim = _currentX*osg::PI;
float elevation = _currentY*osg::PI_2;
osg::Vec3 direction(sin(azim)*cos(elevation),sin(elevation),cos(azim)*cos(elevation));
direction = osg::Matrixd::transform3x3(matrix,direction);
direction = osg::Matrixd::transform3x3(matrix, direction);
direction.normalize();
texenv.setConstantColor(osg::Vec4((direction.x()+1.0f)*0.5f,(direction.y()+1.0f)*0.5f,(direction.z()+1.0f)*0.5f,1.0f));
light->setPosition(osg::Vec4(direction,0.0f));
}
osg::Matrixd _viewMatrix;
float _currentX, _currentY;
@ -975,17 +934,17 @@ bool SlideEventHandler::handle(const osgGA::GUIEventAdapter& ea,osgGA::GUIAction
*/
else if (ea.getKey()=='u')
{
updateAlpha(true,false,ea.getX(),ea.getY());
updateAlpha(true,false,ea.getXnormalized(),ea.getYnormalized());
return true;
}
else if (ea.getKey()=='i')
{
updateAlpha(false,true,ea.getX(),ea.getY());
updateAlpha(false,true,ea.getXnormalized(),ea.getYnormalized());
return true;
}
else if (ea.getKey()=='k')
{
updateLight(ea.getX(),ea.getY());
updateLight(ea.getXnormalized(),ea.getYnormalized());
return true;
}
@ -1232,8 +1191,7 @@ void SlideEventHandler::updateOperators()
if (_viewer.valid())
{
UpdateLightVisitor uav(_viewer->getCamera()->getViewMatrix(),0.0f,0.0f);
_viewer->getSceneData()->accept(uav);
updateLight(0.0f,0.0f);
}
}
@ -1288,6 +1246,19 @@ void SlideEventHandler::updateLight(float x, float y)
UpdateLightVisitor uav(_viewer->getCamera()->getViewMatrix(),x,y);
_viewer->getSceneData()->accept(uav);
if (_viewer->getLightingMode()!= osg::View::NO_LIGHT && _viewer->getLight())
{
if (_viewer->getLightingMode()== osg::View::SKY_LIGHT)
{
uav.apply(_viewer->getCamera()->getViewMatrix(), _viewer->getLight());
}
else if (_viewer->getLightingMode()== osg::View::HEADLIGHT)
{
uav.apply(osg::Matrix::identity(), _viewer->getLight());
}
}
}
void SlideEventHandler::compileSlide(unsigned int slideNum)