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Added triangle index functor to src/osgUtil/SphereSegment.cpp for computing

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the intersection between an indivual geometry and the sphere segment.

Converted the terrain in osgspheresegment to be an osg::Geometry based
drawable rather than a osg::ShapeDrawable/osg::HeightField one to make it
more practicle to use as a test for the new SphereSegment intersection code.
This commit is contained in:
Robert Osfield
2005-09-09 11:13:40 +00:00
parent 67e8e0b287
commit 745834c329
3 changed files with 199 additions and 27 deletions
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98
examples/osgspheresegment/osgspheresegment.cpp
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@@ -8,6 +8,8 @@
#include <osg/MatrixTransform>
#include <osg/Geometry>
#include <osgUtil/SmoothingVisitor>
#include <osgDB/ReadFile>
#include <osgText/Text>
@@ -233,24 +235,84 @@ void build_world(osg::Group *root)
terrainGeode->setStateSet( stateset );
float size = 1000; // 10km;
float scale = size/39.0f; // 10km;
float z_scale = scale*3.0f;
osg::HeightField* grid = new osg::HeightField;
grid->allocate(38,39);
grid->setXInterval(scale);
grid->setYInterval(scale);
for(unsigned int r=0;r<39;++r)
{
for(unsigned int c=0;c<38;++c)
{
grid->setHeight(c,r,z_scale*vertex[r+c*39][2]);
}
}
terrainGeode->addDrawable(new osg::ShapeDrawable(grid));
{
unsigned int numColumns = 38;
unsigned int numRows = 39;
unsigned int r, c;
osg::Vec3 origin(0.0f,0.0f,0.0f);
osg::Vec3 size(1000.0f,1000.0f,250.0f);
osg::Geometry* geometry = new osg::Geometry;
osg::Vec3Array& v = *(new osg::Vec3Array(numColumns*numRows));
osg::Vec2Array& tc = *(new osg::Vec2Array(numColumns*numRows));
osg::Vec4ubArray& color = *(new osg::Vec4ubArray(1));
color[0].set(255,255,255,255);
float rowCoordDelta = size.y()/(float)(numRows-1);
float columnCoordDelta = size.x()/(float)(numColumns-1);
float rowTexDelta = 1.0f/(float)(numRows-1);
float columnTexDelta = 1.0f/(float)(numColumns-1);
// compute z range of z values of grid data so we can scale it.
float min_z = FLT_MAX;
float max_z = -FLT_MAX;
for(r=0;r<numRows;++r)
{
for(c=0;c<numColumns;++c)
{
min_z = osg::minimum(min_z,vertex[r+c*numRows][2]);
max_z = osg::maximum(max_z,vertex[r+c*numRows][2]);
}
}
float scale_z = size.z()/(max_z-min_z);
osg::Vec3 pos = origin;
osg::Vec2 tex(0.0f,0.0f);
int vi=0;
for(r=0;r<numRows;++r)
{
pos.x() = origin.x();
tex.x() = 0.0f;
for(c=0;c<numColumns;++c)
{
v[vi].set(pos.x(),pos.y(),pos.z()+(vertex[r+c*numRows][2]-min_z)*scale_z);
tc[vi] = tex;
pos.x()+=columnCoordDelta;
tex.x()+=columnTexDelta;
++vi;
}
pos.y() += rowCoordDelta;
tex.y() += rowTexDelta;
}
geometry->setVertexArray(&v);
geometry->setTexCoordArray(0, &tc);
geometry->setColorArray(&color);
geometry->setColorBinding(osg::Geometry::BIND_OVERALL);
for(r=0;r<numRows-1;++r)
{
osg::DrawElementsUShort& drawElements = *(new osg::DrawElementsUShort(GL_QUAD_STRIP,2*numColumns));
geometry->addPrimitiveSet(&drawElements);
int ei=0;
for(c=0;c<numColumns;++c)
{
drawElements[ei++] = (r+1)*numColumns+c;
drawElements[ei++] = (r)*numColumns+c;
}
}
osgUtil::SmoothingVisitor smoother;
smoother.smooth(*geometry);
terrainGeode->addDrawable(geometry);
}
}
@@ -272,7 +334,7 @@ void build_world(osg::Group *root)
root->addChild(ss.get());
}
osgSim::SphereSegment::LineList lines = ss->computeIntersection(terrainGeode.get(), osg::Matrixd::identity());
osgSim::SphereSegment::LineList lines = ss->computeIntersection(osg::Matrixd::identity(), terrainGeode.get());
if (!lines.empty())
{
osg::notify(osg::NOTICE)<<"We've found intersections!!!!"<<std::endl;