500 lines
16 KiB
C++
500 lines
16 KiB
C++
/* OpenSceneGraph example, osglogo.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#include <osg/Geode>
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#include <osg/ShapeDrawable>
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#include <osg/Material>
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#include <osg/Texture2D>
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#include <osg/Geometry>
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#include <osg/MatrixTransform>
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#include <osg/PositionAttitudeTransform>
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#include <osg/BlendFunc>
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#include <osg/ClearNode>
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#include <osg/Version>
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#include <osgUtil/Tessellator>
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#include <osgUtil/CullVisitor>
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#include <osgText/Text>
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#include <osgGA/TrackballManipulator>
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#include <osgGA/StateSetManipulator>
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#include <osgViewer/Viewer>
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#include <osgDB/ReadFile>
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#include <iostream>
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static bool s_useSDF = false;
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class MyBillboardTransform : public osg::PositionAttitudeTransform
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{
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public:
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MyBillboardTransform():
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_axis(0.0f,0.0f,1.0f),
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_normal(0.0f,-1.0f,0.0f)
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{
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}
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bool computeLocalToWorldMatrix(osg::Matrix& matrix,osg::NodeVisitor* nv) const
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{
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osg::Quat billboardRotation;
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osgUtil::CullVisitor* cullvisitor = dynamic_cast<osgUtil::CullVisitor*>(nv);
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if (cullvisitor)
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{
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osg::Vec3 eyevector = cullvisitor->getEyeLocal()-_position;
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eyevector.normalize();
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osg::Vec3 side = _axis^_normal;
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side.normalize();
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float angle = atan2(eyevector*_normal,eyevector*side);
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billboardRotation.makeRotate(osg::PI_2-angle,_axis);
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}
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matrix.preMultTranslate(_position);
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matrix.preMultRotate(billboardRotation);
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matrix.preMultRotate(_attitude);
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matrix.preMultTranslate(-_pivotPoint);
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return true;
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}
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void setAxis(const osg::Vec3& axis) { _axis = axis; }
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void setNormal(const osg::Vec3& normal) { _normal = normal; }
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protected:
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virtual ~MyBillboardTransform() {}
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osg::Vec3 _axis;
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osg::Vec3 _normal;
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};
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osg::Geometry* createWing(const osg::Vec3& left, const osg::Vec3& nose, const osg::Vec3& right,float chordRatio,const osg::Vec4& color)
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{
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osg::Geometry* geom = new osg::Geometry;
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osg::Vec3 normal = (nose-right)^(left-nose);
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normal.normalize();
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osg::Vec3 left_to_right = right-left;
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osg::Vec3 mid = (right+left)*0.5f;
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osg::Vec3 mid_to_nose = (nose-mid)*chordRatio*0.5f;
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osg::Vec3Array* vertices = new osg::Vec3Array;
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vertices->push_back(left);
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//vertices->push_back(mid+mid_to_nose);
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unsigned int noSteps = 40;
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for(unsigned int i=1;i<noSteps;++i)
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{
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float ratio = (float)i/(float)noSteps;
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vertices->push_back(left + left_to_right*ratio + mid_to_nose* (cosf((ratio-0.5f)*osg::PI*2.0f)+1.0f));
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}
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vertices->push_back(right);
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vertices->push_back(nose);
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geom->setVertexArray(vertices);
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osg::Vec3Array* normals = new osg::Vec3Array;
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normals->push_back(normal);
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geom->setNormalArray(normals, osg::Array::BIND_OVERALL);
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osg::Vec4Array* colors = new osg::Vec4Array;
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colors->push_back(color);
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geom->setColorArray(colors, osg::Array::BIND_OVERALL);
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geom->addPrimitiveSet(new osg::DrawArrays(GL_POLYGON,0,vertices->getNumElements()));
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osgUtil::Tessellator tessellator;
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tessellator.retessellatePolygons(*geom);
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return geom;
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}
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osg:: Node* createTextBelow(const osg::BoundingBox& bb, const std::string& label, const std::string&)
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{
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osg::Geode* geode = new osg::Geode();
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std::string font("fonts/arial.ttf");
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osgText::Text* text = new osgText::Text;
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text->setFont(font);
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text->setFontResolution(64,64);
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if (s_useSDF)
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{
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text->getFont()->setGyphTextureFeatures(osgText::GlyphTexture::ALL_FEATURES);
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text->setBackdropImplementation(osgText::Text::USE_SHADERS);
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}
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text->setAlignment(osgText::Text::CENTER_CENTER);
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text->setAxisAlignment(osgText::Text::XZ_PLANE);
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text->setPosition(bb.center()-osg::Vec3(0.0f,0.0f,(bb.zMax()-bb.zMin())));
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text->setColor(osg::Vec4(0.37f,0.48f,0.67f,1.0f));
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text->setText(label);
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geode->addDrawable( text );
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return geode;
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}
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osg:: Node* createTextLeft(const osg::BoundingBox& bb, const std::string& label, const std::string& subscript)
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{
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osg::Geode* geode = new osg::Geode();
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osg::StateSet* stateset = geode->getOrCreateStateSet();
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stateset->setMode(GL_LIGHTING,osg::StateAttribute::OFF);
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//std::string font("fonts/times.ttf");
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std::string font("fonts/arial.ttf");
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osgText::Text* text = new osgText::Text;
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text->setFont(font);
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text->setFontResolution(110,120);
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if (s_useSDF)
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{
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text->getFont()->setGyphTextureFeatures(osgText::GlyphTexture::ALL_FEATURES);
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text->setBackdropImplementation(osgText::Text::USE_SHADERS);
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}
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text->setAlignment(osgText::Text::RIGHT_CENTER);
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text->setAxisAlignment(osgText::Text::XZ_PLANE);
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text->setCharacterSize((bb.zMax()-bb.zMin())*1.0f);
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text->setPosition(bb.center()-osg::Vec3((bb.xMax()-bb.xMin()),-(bb.yMax()-bb.yMin())*0.5f,(bb.zMax()-bb.zMin())*0.1f));
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text->setColor(osg::Vec4(0.20f,0.45f,0.60f,1.0f)); // OGL logo colour
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text->setBackdropType(osgText::Text::OUTLINE);
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text->setBackdropOffset(0.03f);
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text->setBackdropColor(osg::Vec4(0.0f, 0.0f, 0.5f, 1.0f));
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text->setColorGradientMode(osgText::Text::OVERALL);
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osg::Vec4 lightblue(0.30f,0.6f,0.90f,1.0f);
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osg::Vec4 blue(0.10f,0.30f,0.40f,1.0f);
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text->setColorGradientCorners(lightblue, blue, blue, lightblue);
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text->setText(label);
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geode->addDrawable( text );
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if (!subscript.empty())
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{
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osgText::Text* subscriptText = new osgText::Text;
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subscriptText->setFont(font);
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subscriptText->setText(subscript);
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subscriptText->setAlignment(osgText::Text::RIGHT_CENTER);
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subscriptText->setAxisAlignment(osgText::Text::XZ_PLANE);
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subscriptText->setPosition(bb.center()-osg::Vec3((bb.xMax()-bb.xMin())*4.3f,-(bb.yMax()-bb.yMin())*0.5f,(bb.zMax()-bb.zMin())*0.6f));
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subscriptText->setColor(osg::Vec4(0.0f,0.0f,0.0f,1.0f)); // black
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geode->addDrawable( subscriptText );
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}
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return geode;
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}
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osg:: Node* createGlobe(const osg::BoundingBox& bb,float ratio, const std::string& filename)
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{
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osg::MatrixTransform* xform = new osg::MatrixTransform;
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xform->setUpdateCallback(new osg::AnimationPathCallback(bb.center(),osg::Vec3(0.0f,0.0f,1.0f),osg::inDegrees(10.0f)));
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osg::ref_ptr<osg::Node> bluemarble = filename.empty() ? 0 : osgDB::readRefNodeFile(filename.c_str());
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if (bluemarble)
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{
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const osg::BoundingSphere& bs = bluemarble->getBound();
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float s = 1.2*bb.radius()/bs.radius();
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osg::MatrixTransform* positioner = new osg::MatrixTransform;
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positioner->setMatrix(osg::Matrix::translate(-bs.center())*osg::Matrix::scale(s,s,s)*osg::Matrix::translate(bb.center()));
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positioner->addChild(bluemarble);
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xform->addChild(positioner);
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}
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else
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{
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osg::Geode* geode = new osg::Geode();
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osg::StateSet* stateset = geode->getOrCreateStateSet();
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osg::ref_ptr<osg::Image> image = osgDB::readRefImageFile("Images/land_shallow_topo_2048.jpg");
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if (image)
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{
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osg::Texture2D* texture = new osg::Texture2D;
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texture->setImage(image);
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texture->setMaxAnisotropy(8);
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stateset->setTextureAttributeAndModes(0,texture,osg::StateAttribute::ON);
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}
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osg::Material* material = new osg::Material;
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stateset->setAttribute(material);
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// the globe
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geode->addDrawable(new osg::ShapeDrawable(new osg::Sphere(bb.center(),bb.radius()*ratio)));
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xform->addChild(geode);
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}
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return xform;
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}
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osg:: Node* createBox(const osg::BoundingBox& bb,float chordRatio)
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{
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osg::Geode* geode = new osg::Geode();
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osg::Vec4 white(1.0f,1.0f,1.0f,1.0f);
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// front faces.
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geode->addDrawable(createWing(bb.corner(4),bb.corner(6),bb.corner(7),chordRatio,white));
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geode->addDrawable(createWing(bb.corner(7),bb.corner(5),bb.corner(4),chordRatio,white));
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geode->addDrawable(createWing(bb.corner(4),bb.corner(5),bb.corner(1),chordRatio,white));
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geode->addDrawable(createWing(bb.corner(1),bb.corner(0),bb.corner(4),chordRatio,white));
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geode->addDrawable(createWing(bb.corner(1),bb.corner(5),bb.corner(7),chordRatio,white));
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geode->addDrawable(createWing(bb.corner(7),bb.corner(3),bb.corner(1),chordRatio,white));
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// back faces
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geode->addDrawable(createWing(bb.corner(2),bb.corner(0),bb.corner(1),chordRatio,white));
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geode->addDrawable(createWing(bb.corner(1),bb.corner(3),bb.corner(2),chordRatio,white));
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geode->addDrawable(createWing(bb.corner(2),bb.corner(3),bb.corner(7),chordRatio,white));
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geode->addDrawable(createWing(bb.corner(7),bb.corner(6),bb.corner(2),chordRatio,white));
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geode->addDrawable(createWing(bb.corner(2),bb.corner(6),bb.corner(4),chordRatio,white));
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geode->addDrawable(createWing(bb.corner(4),bb.corner(0),bb.corner(2),chordRatio,white));
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return geode;
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}
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osg:: Node* createBoxNo5(const osg::BoundingBox& bb,float chordRatio)
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{
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osg::Geode* geode = new osg::Geode();
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osg::Vec4 white(1.0f,1.0f,1.0f,1.0f);
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// front faces.
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geode->addDrawable(createWing(bb.corner(4),bb.corner(6),bb.corner(7),chordRatio,white));
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geode->addDrawable(createWing(bb.corner(1),bb.corner(0),bb.corner(4),chordRatio,white));
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geode->addDrawable(createWing(bb.corner(7),bb.corner(3),bb.corner(1),chordRatio,white));
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// back faces
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geode->addDrawable(createWing(bb.corner(2),bb.corner(0),bb.corner(1),chordRatio,white));
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geode->addDrawable(createWing(bb.corner(1),bb.corner(3),bb.corner(2),chordRatio,white));
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geode->addDrawable(createWing(bb.corner(2),bb.corner(3),bb.corner(7),chordRatio,white));
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geode->addDrawable(createWing(bb.corner(7),bb.corner(6),bb.corner(2),chordRatio,white));
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geode->addDrawable(createWing(bb.corner(2),bb.corner(6),bb.corner(4),chordRatio,white));
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geode->addDrawable(createWing(bb.corner(4),bb.corner(0),bb.corner(2),chordRatio,white));
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return geode;
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}
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osg:: Node* createBoxNo5No2(const osg::BoundingBox& bb,float chordRatio)
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{
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osg::Geode* geode = new osg::Geode();
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// osg::Vec4 red(1.0f,0.0f,0.0f,1.0f);
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// osg::Vec4 green(0.0f,1.0f,0.0f,1.0f);
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// osg::Vec4 blue(0.0f,0.0f,1.0f,1.0f);
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osg::Vec4 red(1.0f,0.12f,0.06f,1.0f);
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osg::Vec4 green(0.21f,0.48f,0.03f,1.0f);
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osg::Vec4 blue(0.20f,0.45f,0.60f,1.0f);
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// front faces.
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geode->addDrawable(createWing(bb.corner(4),bb.corner(6),bb.corner(7),chordRatio,red));
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geode->addDrawable(createWing(bb.corner(1),bb.corner(0),bb.corner(4),chordRatio,green));
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geode->addDrawable(createWing(bb.corner(7),bb.corner(3),bb.corner(1),chordRatio,blue));
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return geode;
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}
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osg:: Node* createBackdrop(const osg::Vec3& corner,const osg::Vec3& top,const osg::Vec3& right)
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{
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osg::Geometry* geom = new osg::Geometry;
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osg::Vec3 normal = (corner-top)^(right-corner);
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normal.normalize();
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osg::Vec3Array* vertices = new osg::Vec3Array;
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vertices->push_back(top);
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vertices->push_back(corner);
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vertices->push_back(right);
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vertices->push_back(right+(top-corner));
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geom->setVertexArray(vertices);
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osg::Vec3Array* normals = new osg::Vec3Array;
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normals->push_back(normal);
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geom->setNormalArray(normals, osg::Array::BIND_OVERALL);
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osg::Vec4Array* colors = new osg::Vec4Array;
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colors->push_back(osg::Vec4(1.0f,1.0f,1.0f,1.0f));
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geom->setColorArray(colors, osg::Array::BIND_OVERALL);
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geom->addPrimitiveSet(new osg::DrawArrays(GL_QUADS,0,vertices->getNumElements()));
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osg::Geode* geode = new osg::Geode();
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geode->addDrawable(geom);
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return geode;
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}
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osg::Node* createLogo(const std::string& filename, const std::string& label, const std::string& subscript)
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{
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osg::BoundingBox bb(osg::Vec3(0.0f,0.0f,0.0f),osg::Vec3(100.0f,100.0f,100.0f));
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float chordRatio = 0.5f;
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float sphereRatio = 0.6f;
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// create a group to hold the whole model.
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osg::Group* logo_group = new osg::Group;
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osg::Quat r1,r2;
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r1.makeRotate(-osg::inDegrees(45.0f),0.0f,0.0f,1.0f);
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r2.makeRotate(osg::inDegrees(45.0f),1.0f,0.0f,0.0f);
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MyBillboardTransform* xform = new MyBillboardTransform;
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xform->setPivotPoint(bb.center());
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xform->setPosition(bb.center());
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xform->setAttitude(r1*r2);
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// // create a transform to orientate the box and globe.
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// osg::MatrixTransform* xform = new osg::MatrixTransform;
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// xform->setDataVariance(osg::Object::STATIC);
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// xform->setMatrix(osg::Matrix::translate(-bb.center())*
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// osg::Matrix::rotate(-osg::inDegrees(45.0f),0.0f,0.0f,1.0f)*
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// osg::Matrix::rotate(osg::inDegrees(45.0f),1.0f,0.0f,0.0f)*
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// osg::Matrix::translate(bb.center()));
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// add the box and globe to it.
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//xform->addChild(createBox(bb,chordRatio));
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//xform->addChild(createBoxNo5(bb,chordRatio));
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xform->addChild(createBoxNo5No2(bb,chordRatio));
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// add the transform to the group.
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logo_group->addChild(xform);
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logo_group->addChild(createGlobe(bb,sphereRatio,filename));
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// add the text to the group.
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//group->addChild(createTextBelow(bb));
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logo_group->addChild(createTextLeft(bb, label, subscript));
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// create the backdrop to render the shadow to.
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osg::Vec3 corner(-900.0f,150.0f,-100.0f);
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osg::Vec3 top(0.0f,0.0f,300.0f); top += corner;
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osg::Vec3 right(1100.0f,0.0f,0.0f); right += corner;
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// osg::Group* backdrop = new osg::Group;
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// backdrop->addChild(createBackdrop(corner,top,right));
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osg::ClearNode* backdrop = new osg::ClearNode;
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backdrop->setClearColor(osg::Vec4(1.0f,1.0f,1.0f,0.0f));
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//osg::Vec3 lightPosition(-500.0f,-2500.0f,500.0f);
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//osg::Node* scene = createShadowedScene(logo_group,backdrop,lightPosition,0.0f,0);
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osg::Group* scene = new osg::Group;
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osg::StateSet* stateset = scene->getOrCreateStateSet();
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stateset->setMode(GL_LIGHTING,osg::StateAttribute::OVERRIDE|osg::StateAttribute::OFF);
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scene->addChild(logo_group);
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scene->addChild(backdrop);
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return scene;
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}
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int main( int argc, char **argv )
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{
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// use an ArgumentParser object to manage the program arguments.
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osg::ArgumentParser arguments(&argc,argv);
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osg::DisplaySettings::instance()->setMinimumNumAlphaBits(8);
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// construct the viewer.
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osgViewer::Viewer viewer;
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// add the state manipulator
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viewer.addEventHandler( new osgGA::StateSetManipulator(viewer.getCamera()->getOrCreateStateSet()) );
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// if user request help write it out to cout.
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if (arguments.read("-h") || arguments.read("--help"))
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{
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arguments.getApplicationUsage()->write(std::cout);
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return 1;
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}
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while(arguments.read("--sdf")) { s_useSDF = true; }
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std::string label = "OpenSceneGraph";
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std::string subscript = "";
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bool showVersion = false;
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while (arguments.read("--version")) { showVersion = true; }
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if( showVersion )
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{
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label += " ";
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label += osgGetVersion();
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}
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while (arguments.read("--label", label)) {}
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while (arguments.read("--subscript", subscript)) {}
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osg::ref_ptr<osg::Node> node;
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if (arguments.argc()>1) node = createLogo(arguments[1], label, subscript);
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else node = createLogo("", label, subscript);
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// add model to viewer.
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viewer.setSceneData( node.get() );
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return viewer.run();
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}
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