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Added to the osggeometry demo.

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This commit is contained in:
Robert Osfield
2002-06-28 14:42:34 +00:00
parent f809ef8a7b
commit ee6444c643
1 changed files with 290 additions and 21 deletions
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311
src/Demos/osggeometry/osggeometry.cpp
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@@ -3,6 +3,9 @@
#include <osg/Material>
#include <osg/Vec3>
#include <osg/Transform>
#include <osg/Texture>
#include <osgDB/ReadFile>
#include <osgGA/TrackballManipulator>
@@ -32,7 +35,7 @@
// with the various primitives in it, and the main() which sets up a basic viewer window and
// adds to the it the scene generated by createScene().
osg::Geode* createScene()
osg::Node* createScene()
{
// create the Geode (Geometry Node) to contain all our osg::Geometry objects.
osg::Geode* geode = new osg::Geode();
@@ -69,7 +72,7 @@ osg::Geode* createScene()
// in a color array.
osg::Vec4Array* colors = new osg::Vec4Array;
// add a white color, colors take the form r,g,b,a with 0.0 off, 1.0 full on.
colors->push_back(osg::Vec4(1.0f,1.0f,1.0f,1.0f));
colors->push_back(osg::Vec4(1.0f,1.0f,0.0f,1.0f));
// pass the color arry to points geometry, note the binding to tell the geometry
// that only use one color for the whole object.
@@ -120,7 +123,7 @@ osg::Geode* createScene()
// set the colors as before, plus using the aobve
osg::Vec4Array* colors = new osg::Vec4Array;
colors->push_back(osg::Vec4(1.0f,1.0f,1.0f,1.0f));
colors->push_back(osg::Vec4(1.0f,1.0f,0.0f,1.0f));
linesGeom->setColorArray(colors);
linesGeom->setColorBinding(osg::Geometry::BIND_OVERALL);
@@ -162,7 +165,7 @@ osg::Geode* createScene()
// set the colors as before, plus using the aobve
osg::Vec4Array* colors = new osg::Vec4Array;
colors->push_back(osg::Vec4(1.0f,1.0f,1.0f,1.0f));
colors->push_back(osg::Vec4(1.0f,1.0f,0.0f,1.0f));
linesGeom->setColorArray(colors);
linesGeom->setColorBinding(osg::Geometry::BIND_OVERALL);
@@ -209,7 +212,7 @@ osg::Geode* createScene()
// set the colors as before, plus using the aobve
osg::Vec4Array* colors = new osg::Vec4Array;
colors->push_back(osg::Vec4(1.0f,1.0f,1.0f,1.0f));
colors->push_back(osg::Vec4(1.0f,1.0f,0.0f,1.0f));
linesGeom->setColorArray(colors);
linesGeom->setColorBinding(osg::Geometry::BIND_OVERALL);
@@ -241,7 +244,7 @@ osg::Geode* createScene()
// standard C pointer, as that in the case of it not being
// assigned it will still be cleaned up automatically.
osg::ref_ptr<osg::Vec4Array> shared_colors = new osg::Vec4Array;
shared_colors->push_back(osg::Vec4(1.0f,1.0f,1.0f,1.0f));
shared_colors->push_back(osg::Vec4(1.0f,1.0f,0.0f,1.0f));
// same trick for shared normal.
osg::ref_ptr<osg::Vec3Array> shared_normals = new osg::Vec3Array;
@@ -249,19 +252,31 @@ osg::Geode* createScene()
// Note on vertex ordering.
// While the OpenGL diagram should vertices specified in a clockwise direction
// in reality you need to specify coords for polygons into a anticlockwise direction
// for their front face to be pointing towards your, get this wrong and you could
// find back face culling removing the wrong faces of your models. The OpenGL diagram
// is just plain wrong, but its nice diagram so we'll keep it for now!
// create POLYGON
{
// create Geometry object to store all the vetices and lines primtive.
osg::Geometry* polyGeom = new osg::Geometry();
// this time we'll a C arrays to initilize the vertices.
// note, anticlockwsie ordering.
// note II, OpenGL polygons must be convex plan polygons, otherwise
// undefined results will occur. If you have concave polygons or ones
// that cross over themselves then use the osgUtil::Tesselator to fix
// the polygons into a set of valid polygons.
osg::Vec3 myCoords[] =
{
osg::Vec3(-0.980488, -2.15188e-09, -0.094753),
osg::Vec3(-0.766264, -2.15188e-09, -0.0576758),
osg::Vec3(-0.807461, -2.15188e-09, -0.181267),
osg::Vec3(-1.0258, -2.15188e-09, -0.26778),
osg::Vec3(-1.0464, 9.18133e-09, -0.193626)
osg::Vec3(-1.0464, 0.0f, -0.193626),
osg::Vec3(-1.0258, 0.0f, -0.26778),
osg::Vec3(-0.807461, 0.0f, -0.181267),
osg::Vec3(-0.766264, 0.0f, -0.0576758),
osg::Vec3(-0.980488, 0.0f, -0.094753)
};
int numCoords = sizeof(myCoords)/sizeof(osg::Vec3);
@@ -296,17 +311,18 @@ osg::Geode* createScene()
// create Geometry object to store all the vetices and lines primtive.
osg::Geometry* polyGeom = new osg::Geometry();
// note, anticlockwsie ordering.
osg::Vec3 myCoords[] =
{
osg::Vec3(-0.222464, 9.18133e-09, -0.13183),
osg::Vec3(-0.160668, 9.18133e-09, -0.0453167),
osg::Vec3(0.0247182, 9.18133e-09, -0.00823939),
osg::Vec3(0.0247182, 9.18133e-09, -0.156548),
osg::Vec3(0.0247182, 0.0f, -0.156548),
osg::Vec3(0.0247182, 0.0f, -0.00823939),
osg::Vec3(-0.160668, 0.0f, -0.0453167),
osg::Vec3(-0.222464, 0.0f, -0.13183),
osg::Vec3(0.13595, -2.15188e-09, -0.255421),
osg::Vec3(0.164788, 9.18133e-09, -0.0453167),
osg::Vec3(0.333696, 9.18133e-09, 0.0329576),
osg::Vec3(0.238942, -2.15188e-09, -0.251302)
osg::Vec3(0.238942, 0.0f, -0.251302),
osg::Vec3(0.333696, 0.0f, 0.0329576),
osg::Vec3(0.164788, 0.0f, -0.0453167),
osg::Vec3(0.13595, 0.0f, -0.255421)
};
int numCoords = sizeof(myCoords)/sizeof(osg::Vec3);
@@ -335,7 +351,253 @@ osg::Geode* createScene()
geode->addDrawable(polyGeom);
}
return geode;
// create QUAD_STRIP
{
// create Geometry object to store all the vetices and lines primtive.
osg::Geometry* polyGeom = new osg::Geometry();
// note, first coord at top, second at bottom, reverse to that buggy OpenGL image..
osg::Vec3 myCoords[] =
{
osg::Vec3(0.733306, -2.15188e-09, -0.0741545),
osg::Vec3(0.758024, -2.15188e-09, -0.205985),
osg::Vec3(0.885735, -2.15188e-09, -0.0576757),
osg::Vec3(0.885735, -2.15188e-09, -0.214224),
osg::Vec3(0.964009, 9.18133e-09, -0.0370773),
osg::Vec3(1.0464, 9.18133e-09, -0.173027),
osg::Vec3(1.11232, -2.15188e-09, 0.0123591),
osg::Vec3(1.12468, 9.18133e-09, -0.164788),
};
int numCoords = sizeof(myCoords)/sizeof(osg::Vec3);
osg::Vec3Array* vertices = new osg::Vec3Array(numCoords,myCoords);
// pass the created vertex array to the points geometry object.
polyGeom->setVertexArray(vertices);
// use the shared color array.
polyGeom->setColorArray(shared_colors.get());
polyGeom->setColorBinding(osg::Geometry::BIND_OVERALL);
// use the shared normal array.
polyGeom->setNormalArray(shared_normals.get());
polyGeom->setNormalBinding(osg::Geometry::BIND_OVERALL);
// This time we simply use primitive, and hardwire the number of coords to use
// since we know up front,
polyGeom->addPrimitive(new osg::DrawArrays(osg::Primitive::QUAD_STRIP,0,numCoords));
// add the points geomtry to the geode.
geode->addDrawable(polyGeom);
}
// create TRIANGLES, TRIANGLE_STRIP and TRIANGLE_FAN all in one Geometry/
{
// create Geometry object to store all the vetices and lines primtive.
osg::Geometry* polyGeom = new osg::Geometry();
// note, first coord at top, second at bottom, reverse to that buggy OpenGL image..
osg::Vec3 myCoords[] =
{
// TRIANGLES 6 vertices, v0..v5
// note in aniclockwise order.
osg::Vec3(-1.12056, -2.15188e-09, -0.840418),
osg::Vec3(-0.95165, -2.15188e-09, -0.840418),
osg::Vec3(-1.11644, 9.18133e-09, -0.716827),
// note in aniclockwise order.
osg::Vec3(-0.840418, 9.18133e-09, -0.778623),
osg::Vec3(-0.622074, 9.18133e-09, -0.613835),
osg::Vec3(-1.067, 9.18133e-09, -0.609715),
// TRIANGLE STRIP 6 vertices, v6..v11
// note defined top point first,
// then anticlockwise for the next two points,
// then alternating to bottom there after.
osg::Vec3(-0.160668, -2.15188e-09, -0.531441),
osg::Vec3(-0.160668, -2.15188e-09, -0.749785),
osg::Vec3(0.0617955, 9.18133e-09, -0.531441),
osg::Vec3(0.168908, -2.15188e-09, -0.753905),
osg::Vec3(0.238942, -2.15188e-09, -0.531441),
osg::Vec3(0.280139, -2.15188e-09, -0.823939),
// TRIANGLE FAN 5 vertices, v12..v16
// note defined in anticlockwsie order.
osg::Vec3(0.844538, 9.18133e-09, -0.712708),
osg::Vec3(1.0258, 9.18133e-09, -0.799221),
osg::Vec3(1.03816, -2.15188e-09, -0.692109),
osg::Vec3(0.988727, 9.18133e-09, -0.568518),
osg::Vec3(0.840418, -2.15188e-09, -0.506723),
};
int numCoords = sizeof(myCoords)/sizeof(osg::Vec3);
osg::Vec3Array* vertices = new osg::Vec3Array(numCoords,myCoords);
// pass the created vertex array to the points geometry object.
polyGeom->setVertexArray(vertices);
// use the shared color array.
polyGeom->setColorArray(shared_colors.get());
polyGeom->setColorBinding(osg::Geometry::BIND_OVERALL);
// use the shared normal array.
polyGeom->setNormalArray(shared_normals.get());
polyGeom->setNormalBinding(osg::Geometry::BIND_OVERALL);
// This time we simply use primitive, and hardwire the number of coords to use
// since we know up front,
polyGeom->addPrimitive(new osg::DrawArrays(osg::Primitive::TRIANGLES,0,6));
polyGeom->addPrimitive(new osg::DrawArrays(osg::Primitive::TRIANGLE_STRIP,6,6));
polyGeom->addPrimitive(new osg::DrawArrays(osg::Primitive::TRIANGLE_FAN,12,5));
// add the points geomtry to the geode.
geode->addDrawable(polyGeom);
}
return geode;
}
// define a node callback to animation a transform as a cycle along the y axis, between 0 and 2.0.
class MyTransformCallback : public osg::NodeCallback
{
public:
MyTransformCallback(float angularVelocity)
{
_angular_velocity = angularVelocity;
}
virtual void operator() (osg::Node* node, osg::NodeVisitor* nv)
{
osg::Transform* transform = dynamic_cast<osg::Transform*>(node);
if (nv && transform && nv->getFrameStamp())
{
double time = nv->getFrameStamp()->getReferenceTime();
transform->setMatrix(osg::Matrix::translate(0.0f,1.0f+cosf(time*_angular_velocity),0.0f));
}
// must continue subgraph traversal.
traverse(node,nv);
}
protected:
float _angular_velocity;
};
osg::Node* createBackground()
{
// we'll create a texture mapped quad to sit behind the Geometry
osg::Image* image = osgDB::readImageFile("primitives.gif");
if (!image) return NULL;
// create Geometry object to store all the vetices and lines primtive.
osg::Geometry* polyGeom = new osg::Geometry();
// note, anticlockwsie ordering.
osg::Vec3 myCoords[] =
{
osg::Vec3(-1.22908f,0.0f,1.0f),
osg::Vec3(-1.22908f,0.0f,-1.0f),
osg::Vec3(1.22908f,0.0f,-1.0f),
osg::Vec3(1.22908f,0.0f,1.0f)
};
int numCoords = sizeof(myCoords)/sizeof(osg::Vec3);
// pass the created vertex array to the points geometry object.
polyGeom->setVertexArray(new osg::Vec3Array(numCoords,myCoords));
osg::Vec4Array* colors = new osg::Vec4Array;
colors->push_back(osg::Vec4(1.0f,1.0f,1.0f,1.0f));
polyGeom->setColorArray(colors);
polyGeom->setColorBinding(osg::Geometry::BIND_OVERALL);
// set the normal in the same way color.
osg::Vec3Array* normals = new osg::Vec3Array;
normals->push_back(osg::Vec3(0.0f,-1.0f,0.0f));
polyGeom->setNormalArray(normals);
polyGeom->setNormalBinding(osg::Geometry::BIND_OVERALL);
osg::Vec2 myTexCoords[] =
{
osg::Vec2(0,1),
osg::Vec2(0,0),
osg::Vec2(1,0),
osg::Vec2(1,1)
};
int numTexCoords = sizeof(myCoords)/sizeof(osg::Vec3);
// pass the created tex coord array to the points geometry object,
// and use it to set texture unit 0.
polyGeom->setTexCoordArray(0,new osg::Vec2Array(numTexCoords,myTexCoords));
// well use indices and DrawElements to define the primitive this time.
unsigned short myIndices[] =
{
0,
1,
2,
3
};
int numIndices = sizeof(myIndices)/sizeof(unsigned short);
// Theere are three variants of the DrawElements osg::Primitive, UByteDrawElements which
// contains unsigned char indicies, UShortDrawElements which contains unsigned short indices,
// and UIntDrawElements whcih contains ... unsigned int indices.
// The first parameter to DrawElements is
polyGeom->addPrimitive(new osg::UShortDrawElements(osg::Primitive::QUADS,4,myIndices));
// new we need to add the texture to the Drawable, we do so by creating a
// StateSet to contain the Texture StateAttribute.
osg::StateSet* stateset = new osg::StateSet;
// set up the texture.
osg::Texture* texture = new osg::Texture;
texture->setImage(image);
stateset->setAttributeAndModes(texture,osg::StateAttribute::ON);
polyGeom->setStateSet(stateset);
// create the Geode (Geometry Node) to contain all our osg::Geometry objects.
osg::Geode* geode = new osg::Geode();
// add the points geomtry to the geode.
geode->addDrawable(polyGeom);
//return geode;
// create a tranform to move the background back and forward with.
osg::Transform* transform = new osg::Transform();
transform->setAppCallback(new MyTransformCallback(1.0f));
transform->addChild(geode);
return transform;
}
int main( int argc, char **argv )
@@ -355,8 +617,15 @@ int main( int argc, char **argv )
// parameters that have been matched.
viewer.readCommandLine(commandLine);
// create the model
osg::Group* root = new osg::Group;
root->addChild( createScene() );
root->addChild( createBackground() );
// add model to viewer.
viewer.addViewport( createScene() );
viewer.addViewport( root );
// register trackball maniupulators.
viewer.registerCameraManipulator(new osgGA::TrackballManipulator);