hi lucie,
here is something with geometry shaders ... might get you inspired
-Nick
On Wed, Dec 22, 2010 at 6:42 PM, lucie lemonnier
lucielemonn...@hotmail.frwrote:
Hi,
I want to draw a 3D curved pipe from a list of points.
I looked at osgModeling but I don't know how to do this.
Would you have an idea using osgModeling or something else?
Thank you!
Cheers,
lucie
--
Read this topic online here:
http://forum.openscenegraph.org/viewtopic.php?p=35083#35083
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#include osg/Notify
#include osg/ref_ptr
#include osg/Geode
#include osg/Geometry
#include osg/Vec3
#include osg/Vec4
#include osg/Program
#include osg/Shader
#include osg/Uniform
#include osgViewer/Viewer
#include osgViewer/ViewerEventHandlers
#include osgGA/StateSetManipulator
///
static const char* vertSource = {
void main(void)\n
{\n
gl_Position = gl_Vertex; \n
gl_FrontColor = gl_Color; \n
}\n
};
static const char* geomSource = {
#version 120 \n
#extension GL_EXT_geometry_shader4 : enable \n
uniform int numCylinderSegments;\n
uniform float cylinderRadius; \n
vec3 rotateVec3(vec4 q,vec3 v) \n
{\n
vec3 uv, uuv;\n
vec3 qvec = vec3(q.x, q.y, q.z); \n
uv = cross(qvec,v); \n
uuv = cross(qvec,uv); \n
uv *= ( 2.0 * q.w ); \n
uuv *= 2.0; \n
return v + uv + uuv; \n
}\n
void main(void)\n
{\n
{ \n
vec4 q1 = gl_FrontColorIn[0]; \n
vec4 p1 = gl_PositionIn[0];\n
vec4 p2 = gl_PositionIn[1];\n
vec4 q2 = gl_FrontColorIn[1]; \n
{ \n
for (int i=0; i=numCylinderSegments; ++i) \n
{ \n
float a = 3.14159265358979323846*2.0 / float(numCylinderSegments);\n
\n
float x = cos(a*float(i))*cylinderRadius; \n
float y = sin(a*float(i))*cylinderRadius; \n
float z = 0.0; \n
\n
float clr = cos(a*float(i)+1.57079632679489661923);\n
vec3 vx = vec3(x,y,z); \n
\n
gl_Position = gl_ModelViewProjectionMatrix * vec4(rotateVec3(q2,vx)+p2.xyz,1.0);\n
gl_FrontColor = vec4(clr,clr,clr,1.0); \n
EmitVertex(); \n
\n
gl_Position = gl_ModelViewProjectionMatrix * vec4(rotateVec3(q1,vx)+p1.xyz,1.0);\n
gl_FrontColor = vec4(clr,clr,clr,1.0); \n
EmitVertex(); \n
} \n
EndPrimitive(); \n
} \n
} \n
}\n
};
static const char* fragSource = {
void main(void)\n
{\n
gl_FragColor = gl_Color; \n
}\n
};
///
osg::Program* createShader(int numVxs)
{
osg::Program* pgm = new osg::Program;
pgm-setName( osgshader2 demo );
pgm-addShader( new osg::Shader( osg::Shader::VERTEX, vertSource ) );
pgm-addShader( new osg::Shader( osg::Shader::FRAGMENT, fragSource ) );
pgm-addShader( new osg::Shader( osg::Shader::GEOMETRY, geomSource ) );
pgm-setParameter( GL_GEOMETRY_VERTICES_OUT_EXT, numVxs );
pgm-setParameter( GL_GEOMETRY_INPUT_TYPE_EXT, GL_LINES );
pgm-setParameter( GL_GEOMETRY_OUTPUT_TYPE_EXT, GL_TRIANGLE_STRIP );
return pgm;
}
///
class CatMullRomCurve : public osg::Geometry
{
public:
CatMullRomCurve(int numCurveSegments = 100, int numCylinderSegments = 35,float cylinderRadius = 0.035f)
{
std::vectorosg::Vec3 vxs;
vxs.push_back( osg::Vec3(0,0,0) );
vxs.push_back( osg::Vec3(1,1,0) );
vxs.push_back( osg::Vec3(0.5,0.5,0.5) );
vxs.push_back( osg::Vec3(1.0,1.0,1.0) );
vxs.push_back( osg::Vec3(1.5,1.5,0.5) );
osg::Vec3Array* vAry = new osg::Vec3Array;
setVertexArray( vAry );
osg::Vec4Array* quatsIncolorArray = new osg::Vec4Array;
setColorArray(quatsIncolorArray);
setColorBinding(BIND_PER_VERTEX);
for (unsigned int i=0; ivxs.size()-1; ++i)
{
int idx0 = i0?i-1:0;
int idx1 = i;
int idx2 = i+1;
int idx3 = idx2(int)vxs.size()-1?idx2+1:idx2;
osg::Vec3 p0 = vxs.at(idx0);
osg::Vec3 p1 = vxs.at(idx1);
osg::Vec3 p2 = vxs.at(idx2);
osg::Vec3 p3 = vxs.at(idx3);
for (int j=0; jnumCurveSegments; ++j)
{
float t =
