Some problems encountered when using tessellator in OSG

Previously, when polygon is used to draw a polygon, the following problems may occur when the point to be added is not clockwise or counterclockwise!

You can use tessellator to solve the problem, but it has never been effective! It took a long time to find out that it was originally a problem with vertex array settings!

If the vertex is set to OSG: vec3darray tessellator, it does not work! It is valid only when OSG: vec3array is set!

Why? I am not very clear now?

The implementation code is as follows:

OSG: geometry * userselector: createpolygon () {OSG: geometry * Geom = new OSG: geometry; OSG: stateset * stateset = new OSG: stateset; // enable Alpha hybrid stateset-> setmode (gl_blend, OSG: stateattribute: On); stateset-> setmode (gl_depth_test, OSG: stateattribute: Off ); stateset-> setmode (gl_lighting, OSG: stateattribute: Off | OSG: stateattribute: protected); // set the rendering priority stateset-> setrenderbindetails (101, "renderbin"); OSG: cullface * cf = new OSG: cullface; stateset-> setattributeandmodes (CF, OSG: stateattribute: Off ); geom-> setstateset (stateset); OSG: vec3array * vertexs = new OSG: vec3array; Geom-> setvertexarray (vertexs); OSG: vec4array * Colors = new OSG :: vec4array; OSG: vec4 color (0.5, 1,); Geom-> setcolorarray (colors); Geom-> setcolorbinding (OSG: geometry: bind_per_primitive_set ); colors-> push_back (color); OSG: ref_ptr <OSG: vec3array> normals = new OSG: vec3array; Geom-> setnormalarray (normals. get (); Geom-> setnormalbinding (OSG: geometry: bind_per_primitive_set); OSG: vec3 normal = OSG: z_axis; Normals-> push_back (normal ); // custom excavation vertexs-> insert (vertexs-> end (), m_vecpts.begin (), m_vecpts.end (); Geom-> addprimitiveset (New OSG: drawarrays (OSG :: drawarrays: polygon, 0, vertexs-> size (); // triangular, concave polygon OSG: ref_ptr <osgutil: tessellator> tes = new osgutil :: tessellator (); tes-> setboundaryonly (false); tes-> setwindingtype (osgutil: tessellator: container); tes-> settessellationtype (osgutil: tessellator: container ); tes-> retessellatepolygons (* Geom); Return Geom ;}

Effect:

If the color is set to OSG: vec4darray
Results will also appear! It is normal only when OSG: vec3array is set! The reason seems to be that the default vec3array of OSG is float in cmake during compilation!

The following code shows the image under the terrain.

OSG: geometry * statisticsselector: createregion () {OSG: geometry * Geom = new OSG: geometry; OSG: stateset * stateset = new OSG: stateset; // enable stateset-> setmode (gl_blend, OSG: stateattribute: On); stateset-> setmode (gl_depth_test, OSG: stateattribute: On); OSG :: cullface * cf = new OSG: cullface; stateset-> setattributeandmodes (CF, OSG: stateattribute: Off); // make these points always draw at the top of OSG :: ref_ptr <OSG: Depth> depth = new OSG: depth; depth-> setfunction (OSG: depth: Always); depth-> setrange (0.0, 0.0 ); stateset-> setattributeandmodes (depth. get (), OSG: stateattribute: On); Geom-> setstateset (stateset); OSG: ref_ptr <OSG: vec3array> vertexs = new OSG: vec3array; geom-> setvertexarray (vertexs. get (); OSG: ref_ptr <OSG: vec4array> colors = new OSG: vec4array; OSG: vec4d color (1.0, 1.0, 1.0, 0.0 ); geom-> setcolorarray (colors. get (); Geom-> setcolorbinding (OSG: geometry: bind_per_primitive_set); colors-> push_back (color); OSG: ref_ptr <OSG :: vec3array> normals = new OSG: vec3array; Geom-> setnormalarray (normals. get (); Geom-> setnormalbinding (OSG: geometry: bind_per_primitive_set); OSG: vec3 normal = OSG: z_axis; Normals-> push_back (normal ); vertexs-> insert (vertexs-> end (), m_vecpts.begin (), m_vecpts.end (); Geom-> addprimitiveset (New OSG: drawarrays (OSG: drawarrays: polygon, 0, vertexs-> size (); // triangular, concave polygon OSG: ref_ptr <osgutil: tessellator> tes = new osgutil: tessellator (); tes-> setboundaryonly (false); tes-> setwindingtype (osgutil: tessellator: Counter); tes-> settessellationtype (osgutil: tessellator: tess_type_geometry ); tes-> retessellatepolygons (* Geom); Return Geom ;}

Effect!

If the color is set to OSG: vec4darray
Results will also appear! It is normal only when OSG: vec3array is set! The reason seems to be that the default vec3array of OSG is float in cmake during compilation!