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Timestamp:
11/09/04 16:01:39 (9 years ago)
Author:
robert
Message:

Added rainer's changes for adding billboard glow around sun.

Files:
1 modified

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  • OpenSceneGraph/trunk/examples/osgplanets/osgplanets.cpp

    r3566 r3589  
    1212#include <osg/LightSource> 
    1313#include <osg/LightModel> 
     14#include <osg/Billboard> 
     15#include <osg/LineWidth> 
    1416#include <osg/TexEnv> 
    1517#include <osg/TexEnvCombine> 
    … …  
    3133static osg::Vec3 defaultPos( 0.0f, 0.0f, 0.0f ); 
    3234static osg::Vec3 centerScope(0.0f, 0.0f, 0.0f); 
    33      
    34  
    35  
     35 
     36/** create quad at specified position. */ 
     37osg::Drawable* createSquare(const osg::Vec3& corner,const osg::Vec3& width,const osg::Vec3& height, osg::Image* image=NULL) 
     38{ 
     39    // set up the Geometry. 
     40    osg::Geometry* geom = new osg::Geometry; 
     41 
     42    osg::Vec3Array* coords = new osg::Vec3Array(4); 
     43    (*coords)[0] = corner; 
     44    (*coords)[1] = corner+width; 
     45    (*coords)[2] = corner+width+height; 
     46    (*coords)[3] = corner+height; 
     47 
     48 
     49    geom->setVertexArray(coords); 
     50 
     51    osg::Vec3Array* norms = new osg::Vec3Array(1); 
     52    (*norms)[0] = width^height; 
     53    (*norms)[0].normalize(); 
     54     
     55    geom->setNormalArray(norms); 
     56    geom->setNormalBinding(osg::Geometry::BIND_OVERALL); 
     57 
     58    osg::Vec2Array* tcoords = new osg::Vec2Array(4); 
     59    (*tcoords)[0].set(0.0f,0.0f); 
     60    (*tcoords)[1].set(1.0f,0.0f); 
     61    (*tcoords)[2].set(1.0f,1.0f); 
     62    (*tcoords)[3].set(0.0f,1.0f); 
     63    geom->setTexCoordArray(0,tcoords); 
     64     
     65    osg::Vec4Array* colours = new osg::Vec4Array(1); 
     66    (*colours)[0].set(1.0f,1.0f,1.0f,1.0f); 
     67    geom->setColorArray(colours); 
     68    geom->setColorBinding(osg::Geometry::BIND_OVERALL); 
     69 
     70 
     71    geom->addPrimitiveSet(new osg::DrawArrays(osg::PrimitiveSet::QUADS,0,4)); 
     72     
     73    if (image) 
     74    { 
     75        osg::StateSet* stateset = new osg::StateSet; 
     76        osg::Texture2D* texture = new osg::Texture2D; 
     77        texture->setImage(image); 
     78        stateset->setTextureAttributeAndModes(0,texture,osg::StateAttribute::ON); 
     79        stateset->setMode(GL_LIGHTING, osg::StateAttribute::OFF); 
     80        stateset->setMode(GL_BLEND, osg::StateAttribute::ON); 
     81        stateset->setRenderingHint(osg::StateSet::TRANSPARENT_BIN); 
     82        geom->setStateSet(stateset); 
     83    } 
     84     
     85    return geom; 
     86} 
     87 
     88osg::Image* createBillboardImage(const osg::Vec4& centerColour, unsigned int size, float power) 
     89{ 
     90    osg::Vec4 backgroundColour = centerColour; 
     91    backgroundColour[3] = 0.0f; 
     92     
     93    osg::Image* image = new osg::Image; 
     94    image->allocateImage(size,size,1, 
     95                         GL_RGBA,GL_UNSIGNED_BYTE); 
     96      
     97      
     98    float mid = (float(size)-1)*0.5f; 
     99    float div = 2.0f/float(size); 
     100    for(unsigned int r=0;r<size;++r) 
     101    { 
     102        unsigned char* ptr = image->data(0,r,0); 
     103        for(unsigned int c=0;c<size;++c) 
     104        { 
     105            float dx = (float(c) - mid)*div; 
     106            float dy = (float(r) - mid)*div; 
     107            float r = powf(1.0f-sqrtf(dx*dx+dy*dy),power); 
     108            if (r<0.0f) r=0.0f; 
     109            osg::Vec4 color = centerColour*r+backgroundColour*(1.0f-r); 
     110            // color.set(1.0f,1.0f,1.0f,0.5f); 
     111            *ptr++ = (unsigned char)((color[0])*255.0f); 
     112            *ptr++ = (unsigned char)((color[1])*255.0f); 
     113            *ptr++ = (unsigned char)((color[2])*255.0f); 
     114            *ptr++ = (unsigned char)((color[3])*255.0f); 
     115        } 
     116    } 
     117    return image; 
     118 
     119    //return osgDB::readImageFile("spot.dds"); 
     120} 
    36121 
    37122 
    … …  
    251336    material->setEmission( osg::Material::FRONT_AND_BACK, osg::Vec4( 1.0f, 1.0f, 0.0f, 0.0f ) ); 
    252337    sunStateSet->setAttributeAndModes( material, osg::StateAttribute::ON ); 
    253  
     338     
     339    osg::Billboard* sunBillboard = new osg::Billboard(); 
     340    sunBillboard->setMode(osg::Billboard::POINT_ROT_EYE); 
     341    sunBillboard->addDrawable( 
     342        createSquare(osg::Vec3(-5.0f,0.0f,-5.0f),osg::Vec3(10.0f,0.0f,0.0f),osg::Vec3(0.0f,0.0f,10.0f),createBillboardImage( osg::Vec4( 1.0, 1.0, 0, 1.0f), 64, 1.0) ), 
     343        osg::Vec3(0.0f,0.0f,0.0f)); 
     344         
     345    sunLight->addChild( sunBillboard ); 
     346     
     347     
    254348    // stick sun right under root, no transformations for the sun 
    255349    sunLight->addChild( sun );