root/OpenSceneGraph/trunk/examples/osglogo/osglogo.cpp @ 13998

Revision 13574, 16.2 kB (checked in by robert, 3 days ago)

Added shaders to support experimental shader based displacement mapping technique osgTerrain::ShaderTerrain?.

  • Property svn:eol-style set to native
  • Property svn:keywords set to Author Date Id Revision
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1/* OpenSceneGraph example, osglogo.
2*
3*  Permission is hereby granted, free of charge, to any person obtaining a copy
4*  of this software and associated documentation files (the "Software"), to deal
5*  in the Software without restriction, including without limitation the rights
6*  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
7*  copies of the Software, and to permit persons to whom the Software is
8*  furnished to do so, subject to the following conditions:
9*
10*  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
11*  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
12*  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
13*  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
14*  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
15*  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
16*  THE SOFTWARE.
17*/
18
19#include <osg/Geode>
20#include <osg/ShapeDrawable>
21#include <osg/Material>
22#include <osg/Texture2D>
23#include <osg/Geometry>
24#include <osg/MatrixTransform>
25#include <osg/PositionAttitudeTransform>
26#include <osg/BlendFunc>
27#include <osg/ClearNode>
28#include <osg/Version>
29
30#include <osgUtil/Tessellator>
31#include <osgUtil/CullVisitor>
32
33#include <osgText/Text>
34
35#include <osgGA/TrackballManipulator>
36
37#include <osgViewer/Viewer>
38
39#include <osgDB/ReadFile>
40
41#include <iostream>
42
43class MyBillboardTransform : public osg::PositionAttitudeTransform
44{
45    public:
46
47        MyBillboardTransform():
48            _axis(0.0f,0.0f,1.0f),
49            _normal(0.0f,-1.0f,0.0f)
50        {
51        }
52
53        bool computeLocalToWorldMatrix(osg::Matrix& matrix,osg::NodeVisitor* nv) const
54        {
55            osg::Quat billboardRotation;
56            osgUtil::CullVisitor* cullvisitor = dynamic_cast<osgUtil::CullVisitor*>(nv);
57            if (cullvisitor)
58            {
59                osg::Vec3 eyevector = cullvisitor->getEyeLocal()-_position;
60                eyevector.normalize();
61
62                osg::Vec3 side = _axis^_normal;
63                side.normalize();
64
65                float angle = atan2(eyevector*_normal,eyevector*side);
66                billboardRotation.makeRotate(osg::PI_2-angle,_axis);
67
68            }
69
70            matrix.preMultTranslate(_position);
71            matrix.preMultRotate(billboardRotation);
72            matrix.preMultRotate(_attitude);
73            matrix.preMultTranslate(-_pivotPoint);
74            return true;
75        }
76
77
78
79        void setAxis(const osg::Vec3& axis) { _axis = axis; }
80
81        void setNormal(const osg::Vec3& normal) { _normal = normal; }
82
83    protected:
84
85        virtual ~MyBillboardTransform() {}
86
87        osg::Vec3 _axis;
88        osg::Vec3 _normal;
89};
90
91
92osg::Geometry* createWing(const osg::Vec3& left, const osg::Vec3& nose, const osg::Vec3& right,float chordRatio,const osg::Vec4& color)
93{
94    osg::Geometry* geom = new osg::Geometry;
95
96    osg::Vec3 normal = (nose-right)^(left-nose);
97    normal.normalize();
98
99    osg::Vec3 left_to_right = right-left;
100    osg::Vec3 mid = (right+left)*0.5f;
101    osg::Vec3 mid_to_nose = (nose-mid)*chordRatio*0.5f;
102
103    osg::Vec3Array* vertices = new osg::Vec3Array;
104    vertices->push_back(left);
105    //vertices->push_back(mid+mid_to_nose);
106
107    unsigned int noSteps = 40;
108    for(unsigned int i=1;i<noSteps;++i)
109    {
110        float ratio = (float)i/(float)noSteps;
111        vertices->push_back(left + left_to_right*ratio + mid_to_nose* (cosf((ratio-0.5f)*osg::PI*2.0f)+1.0f));
112    }
113
114    vertices->push_back(right);
115    vertices->push_back(nose);
116
117    geom->setVertexArray(vertices);
118
119
120    osg::Vec3Array* normals = new osg::Vec3Array;
121    normals->push_back(normal);
122    geom->setNormalArray(normals, osg::Array::BIND_OVERALL);
123
124
125    osg::Vec4Array* colors = new osg::Vec4Array;
126    colors->push_back(color);
127    geom->setColorArray(colors, osg::Array::BIND_OVERALL);
128
129
130    geom->addPrimitiveSet(new osg::DrawArrays(GL_POLYGON,0,vertices->getNumElements()));
131
132    osgUtil::Tessellator tessellator;
133    tessellator.retessellatePolygons(*geom);
134
135    return geom;
136
137}
138
139osg:: Node* createTextBelow(const osg::BoundingBox& bb, const std::string& label, const std::string&)
140{
141    osg::Geode* geode = new osg::Geode();
142
143    std::string font("fonts/arial.ttf");
144
145    osgText::Text* text = new  osgText::Text;
146
147    text->setFont(font);
148    text->setFontResolution(64,64);
149    text->setAlignment(osgText::Text::CENTER_CENTER);
150    text->setAxisAlignment(osgText::Text::XZ_PLANE);
151    text->setPosition(bb.center()-osg::Vec3(0.0f,0.0f,(bb.zMax()-bb.zMin())));
152    text->setColor(osg::Vec4(0.37f,0.48f,0.67f,1.0f));
153    text->setText(label);
154
155    geode->addDrawable( text );
156
157    return geode;
158}
159
160osg:: Node* createTextLeft(const osg::BoundingBox& bb, const std::string& label, const std::string& subscript)
161{
162    osg::Geode* geode = new osg::Geode();
163
164
165    osg::StateSet* stateset = geode->getOrCreateStateSet();
166    stateset->setMode(GL_LIGHTING,osg::StateAttribute::OFF);
167
168
169    //std::string font("fonts/times.ttf");
170    std::string font("fonts/arial.ttf");
171
172    osgText::Text* text = new  osgText::Text;
173
174    text->setFont(font);
175    text->setFontResolution(110,120);
176    text->setAlignment(osgText::Text::RIGHT_CENTER);
177    text->setAxisAlignment(osgText::Text::XZ_PLANE);
178    text->setCharacterSize((bb.zMax()-bb.zMin())*1.0f);
179    text->setPosition(bb.center()-osg::Vec3((bb.xMax()-bb.xMin()),-(bb.yMax()-bb.yMin())*0.5f,(bb.zMax()-bb.zMin())*0.1f));
180    //text->setColor(osg::Vec4(0.37f,0.48f,0.67f,1.0f)); // Neil's original OSG colour
181    text->setColor(osg::Vec4(0.20f,0.45f,0.60f,1.0f)); // OGL logo colour
182    text->setText(label);
183
184#if 1
185    text->setBackdropType(osgText::Text::OUTLINE);
186//   text->setBackdropType(osgText::Text::DROP_SHADOW_BOTTOM_RIGHT);
187
188    text->setBackdropImplementation(osgText::Text::POLYGON_OFFSET);
189//    text->setBackdropImplementation(osgText::Text::NO_DEPTH_BUFFER);
190//    text->setBackdropImplementation(osgText::Text::DEPTH_RANGE);
191//    text->setBackdropImplementation(osgText::Text::STENCIL_BUFFER);
192
193    text->setBackdropOffset(0.05f);
194    text->setBackdropColor(osg::Vec4(0.0f, 0.0f, 0.5f, 1.0f));
195#endif
196
197
198#if 1
199    text->setColorGradientMode(osgText::Text::OVERALL);
200    osg::Vec4 lightblue(0.30f,0.6f,0.90f,1.0f);
201    osg::Vec4 blue(0.10f,0.30f,0.40f,1.0f);
202    text->setColorGradientCorners(lightblue, blue, blue, lightblue);
203#else
204    text->setColorGradientMode(osgText::Text::OVERALL);
205    osg::Vec4 light = osg::Vec4(0.0f, 1.0f, 1.0f, 1.0f);
206    osg::Vec4 dark = osg::Vec4(0.0f, 0.0f, 0.5f, 1.0f);
207    text->setColorGradientCorners(light, dark, dark, light);
208//    text->setColorGradientCorners(dark, light, light, dark);
209#endif
210
211    geode->addDrawable( text );
212
213
214    if (!subscript.empty())
215    {
216        //osgText::Text* subscript = new  osgText::Text(new osgText::TextureFont(font,45));
217
218        osgText::Text* subscriptText = new osgText::Text;
219        subscriptText->setFont(font);
220        subscriptText->setText(subscript);
221        subscriptText->setAlignment(osgText::Text::RIGHT_CENTER);
222        subscriptText->setAxisAlignment(osgText::Text::XZ_PLANE);
223        subscriptText->setPosition(bb.center()-osg::Vec3((bb.xMax()-bb.xMin())*4.3f,-(bb.yMax()-bb.yMin())*0.5f,(bb.zMax()-bb.zMin())*0.6f));
224        subscriptText->setColor(osg::Vec4(0.0f,0.0f,0.0f,1.0f)); // black
225
226        geode->addDrawable( subscriptText );
227    }
228
229    return geode;
230}
231
232osg:: Node* createGlobe(const osg::BoundingBox& bb,float ratio, const std::string& filename)
233{
234    osg::MatrixTransform* xform = new osg::MatrixTransform;
235    xform->setUpdateCallback(new osg::AnimationPathCallback(bb.center(),osg::Vec3(0.0f,0.0f,1.0f),osg::inDegrees(10.0f)));
236
237    osg::Node* bluemarble = filename.empty() ? 0 : osgDB::readNodeFile(filename.c_str());
238    if (bluemarble)
239    {
240        const osg::BoundingSphere& bs = bluemarble->getBound();
241        float s = 1.2*bb.radius()/bs.radius();
242        osg::MatrixTransform* positioner = new osg::MatrixTransform;
243        positioner->setMatrix(osg::Matrix::translate(-bs.center())*osg::Matrix::scale(s,s,s)*osg::Matrix::translate(bb.center()));
244        positioner->addChild(bluemarble);
245
246        xform->addChild(positioner);
247    }
248    else
249    {
250
251        osg::Geode* geode = new osg::Geode();
252
253        osg::StateSet* stateset = geode->getOrCreateStateSet();
254
255        osg::Image* image = osgDB::readImageFile("Images/land_shallow_topo_2048.jpg");
256        if (image)
257        {
258            osg::Texture2D* texture = new osg::Texture2D;
259            texture->setImage(image);
260            texture->setMaxAnisotropy(8);
261            stateset->setTextureAttributeAndModes(0,texture,osg::StateAttribute::ON);
262        }
263
264        osg::Material* material = new osg::Material;
265        stateset->setAttribute(material);
266
267        // the globe
268        geode->addDrawable(new osg::ShapeDrawable(new osg::Sphere(bb.center(),bb.radius()*ratio)));
269
270        xform->addChild(geode);
271    }
272
273    return xform;
274}
275
276osg:: Node* createBox(const osg::BoundingBox& bb,float chordRatio)
277{
278    osg::Geode* geode = new osg::Geode();
279
280    osg::Vec4 white(1.0f,1.0f,1.0f,1.0f);
281
282    // front faces.
283    geode->addDrawable(createWing(bb.corner(4),bb.corner(6),bb.corner(7),chordRatio,white));
284    geode->addDrawable(createWing(bb.corner(7),bb.corner(5),bb.corner(4),chordRatio,white));
285
286    geode->addDrawable(createWing(bb.corner(4),bb.corner(5),bb.corner(1),chordRatio,white));
287    geode->addDrawable(createWing(bb.corner(1),bb.corner(0),bb.corner(4),chordRatio,white));
288
289    geode->addDrawable(createWing(bb.corner(1),bb.corner(5),bb.corner(7),chordRatio,white));
290    geode->addDrawable(createWing(bb.corner(7),bb.corner(3),bb.corner(1),chordRatio,white));
291
292    // back faces
293    geode->addDrawable(createWing(bb.corner(2),bb.corner(0),bb.corner(1),chordRatio,white));
294    geode->addDrawable(createWing(bb.corner(1),bb.corner(3),bb.corner(2),chordRatio,white));
295
296    geode->addDrawable(createWing(bb.corner(2),bb.corner(3),bb.corner(7),chordRatio,white));
297    geode->addDrawable(createWing(bb.corner(7),bb.corner(6),bb.corner(2),chordRatio,white));
298
299    geode->addDrawable(createWing(bb.corner(2),bb.corner(6),bb.corner(4),chordRatio,white));
300    geode->addDrawable(createWing(bb.corner(4),bb.corner(0),bb.corner(2),chordRatio,white));
301
302    return geode;
303}
304
305osg:: Node* createBoxNo5(const osg::BoundingBox& bb,float chordRatio)
306{
307    osg::Geode* geode = new osg::Geode();
308
309    osg::Vec4 white(1.0f,1.0f,1.0f,1.0f);
310
311    // front faces.
312    geode->addDrawable(createWing(bb.corner(4),bb.corner(6),bb.corner(7),chordRatio,white));
313
314    geode->addDrawable(createWing(bb.corner(1),bb.corner(0),bb.corner(4),chordRatio,white));
315
316    geode->addDrawable(createWing(bb.corner(7),bb.corner(3),bb.corner(1),chordRatio,white));
317
318    // back faces
319    geode->addDrawable(createWing(bb.corner(2),bb.corner(0),bb.corner(1),chordRatio,white));
320    geode->addDrawable(createWing(bb.corner(1),bb.corner(3),bb.corner(2),chordRatio,white));
321
322    geode->addDrawable(createWing(bb.corner(2),bb.corner(3),bb.corner(7),chordRatio,white));
323    geode->addDrawable(createWing(bb.corner(7),bb.corner(6),bb.corner(2),chordRatio,white));
324
325    geode->addDrawable(createWing(bb.corner(2),bb.corner(6),bb.corner(4),chordRatio,white));
326    geode->addDrawable(createWing(bb.corner(4),bb.corner(0),bb.corner(2),chordRatio,white));
327
328    return geode;
329}
330
331osg:: Node* createBoxNo5No2(const osg::BoundingBox& bb,float chordRatio)
332{
333    osg::Geode* geode = new osg::Geode();
334
335//    osg::Vec4 red(1.0f,0.0f,0.0f,1.0f);
336//    osg::Vec4 green(0.0f,1.0f,0.0f,1.0f);
337//    osg::Vec4 blue(0.0f,0.0f,1.0f,1.0f);
338
339    osg::Vec4 red(1.0f,0.12f,0.06f,1.0f);
340    osg::Vec4 green(0.21f,0.48f,0.03f,1.0f);
341    osg::Vec4 blue(0.20f,0.45f,0.60f,1.0f);
342
343    // front faces.
344    geode->addDrawable(createWing(bb.corner(4),bb.corner(6),bb.corner(7),chordRatio,red));
345
346    geode->addDrawable(createWing(bb.corner(1),bb.corner(0),bb.corner(4),chordRatio,green));
347
348    geode->addDrawable(createWing(bb.corner(7),bb.corner(3),bb.corner(1),chordRatio,blue));
349
350    return geode;
351}
352
353osg:: Node* createBackdrop(const osg::Vec3& corner,const osg::Vec3& top,const osg::Vec3& right)
354{
355
356
357
358    osg::Geometry* geom = new osg::Geometry;
359
360    osg::Vec3 normal = (corner-top)^(right-corner);
361    normal.normalize();
362
363    osg::Vec3Array* vertices = new osg::Vec3Array;
364    vertices->push_back(top);
365    vertices->push_back(corner);
366
367    vertices->push_back(right);
368    vertices->push_back(right+(top-corner));
369
370    geom->setVertexArray(vertices);
371
372    osg::Vec3Array* normals = new osg::Vec3Array;
373    normals->push_back(normal);
374    geom->setNormalArray(normals, osg::Array::BIND_OVERALL);
375
376    osg::Vec4Array* colors = new osg::Vec4Array;
377    colors->push_back(osg::Vec4(1.0f,1.0f,1.0f,1.0f));
378    geom->setColorArray(colors, osg::Array::BIND_OVERALL);
379
380    geom->addPrimitiveSet(new osg::DrawArrays(GL_QUADS,0,vertices->getNumElements()));
381
382    osg::Geode* geode = new osg::Geode();
383    geode->addDrawable(geom);
384
385    return geode;
386}
387
388osg::Node* createLogo(const std::string& filename, const std::string& label, const std::string& subscript)
389{
390    osg::BoundingBox bb(osg::Vec3(0.0f,0.0f,0.0f),osg::Vec3(100.0f,100.0f,100.0f));
391    float chordRatio = 0.5f;
392    float sphereRatio = 0.6f;
393
394    // create a group to hold the whole model.
395    osg::Group* logo_group = new osg::Group;
396
397    osg::Quat r1,r2;
398    r1.makeRotate(-osg::inDegrees(45.0f),0.0f,0.0f,1.0f);
399    r2.makeRotate(osg::inDegrees(45.0f),1.0f,0.0f,0.0f);
400
401
402    MyBillboardTransform* xform = new MyBillboardTransform;
403    xform->setPivotPoint(bb.center());
404    xform->setPosition(bb.center());
405    xform->setAttitude(r1*r2);
406
407
408//     // create a transform to orientate the box and globe.
409//     osg::MatrixTransform* xform = new osg::MatrixTransform;
410//     xform->setDataVariance(osg::Object::STATIC);
411//     xform->setMatrix(osg::Matrix::translate(-bb.center())*
412//                      osg::Matrix::rotate(-osg::inDegrees(45.0f),0.0f,0.0f,1.0f)*
413//                      osg::Matrix::rotate(osg::inDegrees(45.0f),1.0f,0.0f,0.0f)*
414//                      osg::Matrix::translate(bb.center()));
415
416    // add the box and globe to it.
417    //xform->addChild(createBox(bb,chordRatio));
418    //xform->addChild(createBoxNo5(bb,chordRatio));
419    xform->addChild(createBoxNo5No2(bb,chordRatio));
420    // add the transform to the group.
421    logo_group->addChild(xform);
422
423    logo_group->addChild(createGlobe(bb,sphereRatio,filename));
424
425    // add the text to the group.
426    //group->addChild(createTextBelow(bb));
427    logo_group->addChild(createTextLeft(bb, label, subscript));
428
429
430    // create the backdrop to render the shadow to.
431    osg::Vec3 corner(-900.0f,150.0f,-100.0f);
432    osg::Vec3 top(0.0f,0.0f,300.0f); top += corner;
433    osg::Vec3 right(1100.0f,0.0f,0.0f); right += corner;
434
435
436//     osg::Group* backdrop = new osg::Group;
437//     backdrop->addChild(createBackdrop(corner,top,right));
438
439    osg::ClearNode* backdrop = new osg::ClearNode;
440    backdrop->setClearColor(osg::Vec4(1.0f,1.0f,1.0f,0.0f));
441
442    //osg::Vec3 lightPosition(-500.0f,-2500.0f,500.0f);
443    //osg::Node* scene = createShadowedScene(logo_group,backdrop,lightPosition,0.0f,0);
444
445    osg::Group* scene = new osg::Group;
446
447    osg::StateSet* stateset = scene->getOrCreateStateSet();
448    stateset->setMode(GL_LIGHTING,osg::StateAttribute::OVERRIDE|osg::StateAttribute::OFF);
449
450
451    scene->addChild(logo_group);
452    scene->addChild(backdrop);
453
454    return scene;
455}
456
457int main( int argc, char **argv )
458{
459    // use an ArgumentParser object to manage the program arguments.
460    osg::ArgumentParser arguments(&argc,argv);
461
462    osg::DisplaySettings::instance()->setMinimumNumAlphaBits(8);
463
464    // construct the viewer.
465    osgViewer::Viewer viewer;
466
467    // if user request help write it out to cout.
468    if (arguments.read("-h") || arguments.read("--help"))
469    {
470        arguments.getApplicationUsage()->write(std::cout);
471        return 1;
472    }
473
474    std::string label = "OpenSceneGraph";
475    std::string subscript = "";
476
477    bool showVersion = false;
478    while (arguments.read("--version")) { showVersion = true; }
479    if( showVersion )
480    {
481        label += " ";
482        label += osgGetVersion();
483    }
484
485    while (arguments.read("--label", label)) {}
486    while (arguments.read("--subscript", subscript)) {}
487
488    osg::ref_ptr<osg::Node> node;
489
490    if (arguments.argc()>1) node = createLogo(arguments[1], label, subscript);
491    else node = createLogo("", label, subscript);
492
493    // add model to viewer.
494    viewer.setSceneData( node.get() );
495
496    return viewer.run();
497}
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