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Added point drawing using vertex arrays and distance attenuation for large points

This commit is contained in:
Paolo Cignoni 2008-06-10 00:57:46 +00:00
parent 1059b3d24d
commit 67ce430991
1 changed files with 59 additions and 4 deletions
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63
wrap/gl/trimesh.h
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@ -117,6 +117,7 @@ first draft: it includes glew !
//#include <GL/glew.h> //#include <GL/glew.h>
#include <wrap/gl/space.h> #include <wrap/gl/space.h>
#include <wrap/gl/math.h>
#include <vcg/space/color4.h> #include <vcg/space/color4.h>
namespace vcg { namespace vcg {
@ -163,7 +164,8 @@ public:
}; };
enum HintParamf { enum HintParamf {
HNPCreaseAngle =0, // crease angle in radians HNPCreaseAngle =0, // crease angle in radians
HNPZTwist = 1 // Z offset used in Flatwire and hiddenline modality HNPZTwist = 1, // Z offset used in Flatwire and hiddenline modality
HNPPointSize = 2 // the point size used in point rendering
}; };
template<class MESH_TYPE> template<class MESH_TYPE>
@ -218,7 +220,7 @@ public:
SetHintParamf(HNPCreaseAngle,float(M_PI/5)); SetHintParamf(HNPCreaseAngle,float(M_PI/5));
SetHintParamf(HNPZTwist,0.00005f); SetHintParamf(HNPZTwist,0.00005f);
SetHintParamf(HNPPointSize,1.0f);
} }
~GlTrimesh() ~GlTrimesh()
@ -600,8 +602,10 @@ void DrawFill()
} }
/// Basic Point drawing fucntion
// works also for mesh with deleted vertices
template<NormalMode nm, ColorMode cm> template<NormalMode nm, ColorMode cm>
void DrawPoints() void DrawPointsBase()
{ {
typename MESH_TYPE::VertexIterator vi; typename MESH_TYPE::VertexIterator vi;
glBegin(GL_POINTS); glBegin(GL_POINTS);
@ -614,8 +618,59 @@ void DrawPoints()
glVertex((*vi).P()); glVertex((*vi).P());
} }
glEnd(); glEnd();
} }
/// Utility function that computes in eyespace the current distance between the camera and the center of the bbox of the mesh
double CameraDistance(){
Point3f res;
Matrix44f mm;
glGetv(GL_MODELVIEW_MATRIX,mm);
Point3f c=m->bbox.Center();
res=mm*c;
return Norm(res);
}
template<NormalMode nm, ColorMode cm>
void DrawPoints()
{
glPointSize(GetHintParamf(HNPPointSize));
float camDist=CameraDistance();
float quadratic[] = { 0.0f, 0.0f, 1.0f/(camDist*camDist) };
glPointParameterfv( GL_POINT_DISTANCE_ATTENUATION, quadratic );
glPointParameterf( GL_POINT_SIZE_MAX, 16.0f );
glPointParameterf( GL_POINT_SIZE_MIN, 1.0f );
if(m->vn!=m->vert.size())
{
DrawPointsBase<nm,cm>();
return;
}
// Perfect case, no deleted stuff,
// draw the vertices using vertex arrays
if (nm==NMPerVert)
{
glEnableClientState (GL_NORMAL_ARRAY);
glNormalPointer(GL_FLOAT,sizeof(typename MESH_TYPE::VertexType),&(m->vert.begin()->N()[0]));
}
if (cm==CMPerVert) glEnableClientState (GL_COLOR_ARRAY);
{
glEnableClientState (GL_COLOR_ARRAY);
glColorPointer(4,GL_UNSIGNED_BYTE,sizeof(typename MESH_TYPE::VertexType),&(m->vert.begin()->C()[0]));
}
glEnableClientState (GL_VERTEX_ARRAY);
glVertexPointer(3,GL_FLOAT,sizeof(typename MESH_TYPE::VertexType),&(m->vert.begin()->P()[0]));
//glDrawElements(GL_POINTS ,m->vn,GL_UNSIGNED_INT, &(*indices.begin()) );
glDrawArrays(GL_POINTS,0,m->vn);
glDisableClientState (GL_VERTEX_ARRAY);
if (nm==NMPerVert) glDisableClientState (GL_NORMAL_ARRAY);
if (cm==CMPerVert) glDisableClientState (GL_COLOR_ARRAY);
return;
}
void DrawHidden() void DrawHidden()
{ {