Board technology to create trees

# Include <osgviewer/Viewer> <br/> # include <OSG/positionattitudetransform> <br/> # include <OSG/matrixtransform> <br/> # include <osgdb/readfile> <br/> # include <OSG/image> <br/> # include <OSG/geometry> <br/> # include <OSG/vec3> <br/> # include <OSG/vec2> <br/> # include <OSG/billboard> <br/> # include <OSG/texture2d> </P> <p> OSG:: ref_ptr <OSG: node> createbillboardtree (OSG: ref_ptr <OSG: Image> image) <br/> {<br/> // create a quadrilateral <br/> OSG: ref_ptr <OSG: geometry> geometry = new OSG: geometry; </P> <p> // set the vertex <br/> OSG: ref_ptr <OSG: vec3array> V = new OSG: vec3array; <br/> V-> push_back (OSG: vec3 (-0.5f, 0.0f,-0.5f); <br/> V-> push_back (OSG: vec3 (0.5f, 0.0f,-0.5f); <br/> V-> push_back (OSG: vec3 (0.5f, 0.0f, 0.5f); <br/> V-> push_back (OSG:: vec3 (-0.5f, 0.0f, 0.5f); </P> <p> geometry-> setvertexarray (v. get (); </P> <p> // set the normal <br/> OSG: ref_ptr <OSG: vec3array> normal = new OSG: vec3array; <br/> normal-> push_back (OSG: vec3 (1.0f, 0.0f, 0.0f) ^ OSG: vec3 (0.0f, 0.0f, 1.0f )); <br/> geometry-> setnormalarray (normal. get (); <br/> geometry-> setnormalbinding (OSG: geometry: bind_overall ); </P> <p> // set texture coordinates <br/> OSG: ref_ptr <OSG: vec2array> VT = new OSG: vec2array; <br/> VT-> push_back (OSG: vec2 (0.0f, 0.0f); <br/> VT-> push_back (OSG: vec2 (1.0f, 0.0f )); <br/> VT-> push_back (OSG: vec2 (1.0f, 1.0f); <br/> VT-> push_back (OSG: vec2 (0.0f, 1.0f )); <br/> geometry-> settexcoordarray (0, VT. get (); </P> <p> // draw a quadrilateral <br/> geometry-> addprimitiveset (New OSG: drawarrays (OSG: primitiveset: quads, 0, 4); </P> <p> If (image. get () <br/>{< br/> OSG: ref_ptr <OSG: stateset> stateset = new OSG: stateset; <br/> OSG :: ref_ptr <OSG: texture2d> Texture = new OSG: texture2d; <br/> // associate image <br/> texture-> setimage (image. get (); <br/> // associate the texture2d texture object. The third parameter defaults to on <br/> stateset-> settextureattributeandmodes (0, texture, OSG: stateattribute:: On); <br/> // enable hybrid <br/> stateset-> setmode (gl_blend, OSG: stateattribute: On ); <br/> // disable illumination <br/> stateset-> setmode (gl_lighting, OSG: stateattribute: Off ); </P> <p> geometry-> setstateset (stateset. get (); <br/>}</P> <p> // create a billboard object <br/> OSG: ref_ptr <OSG :: billboard> billboard1 = new OSG: Billboard; <br/> // you can set the rotation mode to the point of view <br/> billboard1-> setmode (OSG: billboard: point_rot_eye ); <br/> // Add a drawable and set its location. The default location is OSG: vec3 (5.0f, 0.0f, 0.0f). <br/> billboard1-> adddrawable (geometry. get (), OSG: vec3 (5.0f, 0.0f, 0.0f); </P> <p> return billboard1.get (); <br/>}< br/> int main (INT argc, char * argv []) <br/>{< br/>/* qapplication A (argc, argv ); <br/> mytest W; <br/> W. show (); <br/> return a.exe C (); */</P> <p> OSG: ref_ptr <osgviewer: viewer> viewer = new osgviewer :: viewer; <br/> OSG: ref_ptr <OSG: group> group = new OSG: group; <br/> OSG: ref_ptr <OSG :: image> image = osgdb: readimagefile ("images/tree0.rgba"); <br/> // zoom <br/> OSG: ref_ptr <OSG :: positionattitudetransform> PAT = new OSG: positionattitudetransform; <br/> pat-> setscale (OSG: vec3 (5.0f, 5.0f, 5.0f )); <br/> pat-> addchild (createbillboardtree (image. get (); </P> <p> group-> addchild (Pat. get (); <br/> OSG: node * cow = osgdb: readnodefile ("cow. OSG "); <br/> group-> addchild (COW); </P> <p> viewer-> setscenedata (group. get (); <br/> viewer-> realize (); </P> <p> return viewer-> Run (); <br/>}