FGFS-4.1/OpenSceneGraph
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Added osgSim::OverlayNode to osganimate and osgspheresegment examples, and

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added support for setting texture size hint and coping with scene graphs
with CoordinateSystemNode in them.
This commit is contained in:
Robert Osfield
2005-09-06 15:48:18 +00:00
parent db24ea247c
commit 5283c11f8a
5 changed files with 135 additions and 48 deletions
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127
src/osgSim/OverlayNode.cpp
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@@ -12,13 +12,16 @@
*/
#include <osg/Texture2D>
#include <osg/CoordinateSystemNode>
#include <osgUtil/CullVisitor>
#include <osgSim/OverlayNode>
using namespace osgSim;
OverlayNode::OverlayNode():
_textureUnit(1)
_textureUnit(1),
_textureSizeHint(1024)
{
init();
}
@@ -26,34 +29,38 @@ OverlayNode::OverlayNode():
OverlayNode::OverlayNode(const OverlayNode& copy, const osg::CopyOp& copyop):
Group(copy,copyop),
_overlaySubgraph(copy._overlaySubgraph),
_textureUnit(copy._textureUnit)
_textureUnit(copy._textureUnit),
_textureSizeHint(copy._textureSizeHint)
{
init();
}
void OverlayNode::init()
{
unsigned int tex_width = 1024;
unsigned int tex_height = 1024;
unsigned int tex_width = _textureSizeHint;
unsigned int tex_height = _textureSizeHint;
osg::Texture2D* texture = new osg::Texture2D;
texture->setTextureSize(tex_width, tex_height);
texture->setInternalFormat(GL_RGBA);
texture->setFilter(osg::Texture2D::MIN_FILTER,osg::Texture2D::LINEAR);
texture->setFilter(osg::Texture2D::MAG_FILTER,osg::Texture2D::LINEAR);
texture->setWrap(osg::Texture2D::WRAP_S,osg::Texture2D::CLAMP_TO_BORDER);
texture->setWrap(osg::Texture2D::WRAP_T,osg::Texture2D::CLAMP_TO_BORDER);
texture->setBorderColor(osg::Vec4(1.0f,1.0f,1.0f,1.0f));
_texture = texture;
if (!_texture)
{
osg::Texture2D* texture = new osg::Texture2D;
texture->setTextureSize(tex_width, tex_height);
texture->setInternalFormat(GL_RGBA);
texture->setFilter(osg::Texture2D::MIN_FILTER,osg::Texture2D::LINEAR);
texture->setFilter(osg::Texture2D::MAG_FILTER,osg::Texture2D::LINEAR);
texture->setWrap(osg::Texture2D::WRAP_S,osg::Texture2D::CLAMP_TO_BORDER);
texture->setWrap(osg::Texture2D::WRAP_T,osg::Texture2D::CLAMP_TO_BORDER);
texture->setBorderColor(osg::Vec4(1.0f,1.0f,1.0f,1.0f));
_texture = texture;
}
// set up the render to texture camera.
if (!_camera)
{
// create the camera
_camera = new osg::CameraNode;
_camera->setClearColor(osg::Vec4(1.0f,0.5f,0.5f,1.0f));
_camera = new osg::CameraNode;
_camera->setClearColor(osg::Vec4(1.0f,1.0f,1.0f,1.0f));
// set viewport
_camera->setViewport(0,0,tex_width,tex_height);
@@ -68,11 +75,11 @@ void OverlayNode::init()
_camera->attach(osg::CameraNode::COLOR_BUFFER, _texture.get());
}
_texgenNode = new osg::TexGenNode;
if (!_texgenNode) _texgenNode = new osg::TexGenNode;
_mainSubgraphStateSet = new osg::StateSet;
if (!_mainSubgraphStateSet) _mainSubgraphStateSet = new osg::StateSet;
setOverlayTextureUnit(1);
setOverlayTextureUnit(_textureUnit);
}
@@ -97,8 +104,7 @@ void OverlayNode::traverse(osg::NodeVisitor& nv)
// if we need to redraw then do cull traversal on camera.
if (!_textureObjectValidList[contextID])
{
osg::Vec3 _position(0,0,0);
// now compute the camera's view and projection matrix to point at the shadower (the camera's children)
osg::BoundingSphere bs;
for(unsigned int i=0; i<_camera->getNumChildren(); ++i)
@@ -108,30 +114,66 @@ void OverlayNode::traverse(osg::NodeVisitor& nv)
if (!bs.valid())
{
osg::notify(osg::WARN) << "bb invalid"<<_camera.get()<<std::endl;
osg::notify(osg::WARN) << "OverlayNode::traverse() - bb invalid"<<_camera.get()<<std::endl;
return;
}
float centerDistance = (_position-bs.center()).length();
float znear = centerDistance-bs.radius();
float zfar = centerDistance+bs.radius();
float zNearRatio = 0.001f;
if (znear<zfar*zNearRatio) znear = zfar*zNearRatio;
float top = (bs.radius()/centerDistance)*znear;
float right = top;
// see if we are within a coordinate system node.
osg::CoordinateSystemNode* csn = 0;
osg::NodePath& nodePath = nv.getNodePath();
for(osg::NodePath::reverse_iterator itr = nodePath.rbegin();
itr != nodePath.rend() && csn==0;
++itr)
{
csn = dynamic_cast<osg::CoordinateSystemNode*>(*itr);
}
_camera->setReferenceFrame(osg::CameraNode::ABSOLUTE_RF);
_camera->setProjectionMatrixAsFrustum(-right,right,-top,top,znear,zfar);
_camera->setViewMatrixAsLookAt(_position,bs.center(),osg::Vec3(0.0f,1.0f,0.0f));
if (csn)
{
osg::Vec3d eyePoint(0.0,0.0,0.0); // center of the planet
double centerDistance = (eyePoint-osg::Vec3d(bs.center())).length();
double znear = centerDistance-bs.radius();
double zfar = centerDistance+bs.radius();
double zNearRatio = 0.001f;
if (znear<zfar*zNearRatio) znear = zfar*zNearRatio;
double top = (bs.radius()/centerDistance)*znear;
double right = top;
_camera->setProjectionMatrixAsFrustum(-right,right,-top,top,znear,zfar);
_camera->setViewMatrixAsLookAt(eyePoint, bs.center(), osg::Vec3(0.0f,1.0f,0.0f));
}
else
{
osg::Vec3d upDirection(0.0,1.0,0.0);
osg::Vec3d viewDirection(0.0,0.0,1.0);
double viewDistance = 2.0*bs.radius();
osg::Vec3d center = bs.center();
osg::Vec3d eyePoint = center+viewDirection*viewDistance;
double znear = viewDistance-bs.radius();
double zfar = viewDistance+bs.radius();
float top = bs.radius();
float right = top;
_camera->setProjectionMatrixAsOrtho(-right,right,-top,top,znear,zfar);
_camera->setViewMatrixAsLookAt(eyePoint,center,upDirection);
}
// compute the matrix which takes a vertex from local coords into tex coords
// will use this later to specify osg::TexGen..
osg::Matrix MVPT = _camera->getViewMatrix() *
_camera->getProjectionMatrix() *
osg::Matrix::translate(1.0,1.0,1.0) *
osg::Matrix::scale(0.5f,0.5f,0.5f);
osg::Matrix::scale(0.5,0.5,0.5);
_texgenNode->getTexGen()->setMode(osg::TexGen::EYE_LINEAR);
_texgenNode->getTexGen()->setPlanesFromMatrix(MVPT);
@@ -139,7 +181,7 @@ void OverlayNode::traverse(osg::NodeVisitor& nv)
_camera->accept(*cv);
// _textureObjectValidList[contextID] = 1;
_textureObjectValidList[contextID] = 1;
}
@@ -186,3 +228,14 @@ void OverlayNode::setOverlayTextureUnit(unsigned int unit)
_mainSubgraphStateSet->setTextureMode(_textureUnit, GL_TEXTURE_GEN_R, osg::StateAttribute::ON);
_mainSubgraphStateSet->setTextureMode(_textureUnit, GL_TEXTURE_GEN_Q, osg::StateAttribute::ON);
}
void OverlayNode::setOverlayTextureSizeHint(unsigned int size)
{
if (_textureSizeHint == size) return;
_textureSizeHint = size;
//_texture->dirtyTextureObject();
_texture->setTextureSize(_textureSizeHint, _textureSizeHint);
_camera->setViewport(0,0,_textureSizeHint,_textureSizeHint);
}