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Add support for a finer grained mesh on the distortion mesh for higher quality results.

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This commit is contained in:
Robert Osfield 2013-04-11 17:12:32 +00:00
parent 7ff4be954b
commit f79d89e0ce
1 changed files with 57 additions and 7 deletions
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62
examples/osgkeystone/osgkeystone.cpp
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@ -400,11 +400,25 @@ struct KeystoneUpdateCallback : public osg::Drawable::UpdateCallback
osg::Vec3Array* vertices = dynamic_cast<osg::Vec3Array*>(geometry->getVertexArray()); osg::Vec3Array* vertices = dynamic_cast<osg::Vec3Array*>(geometry->getVertexArray());
if (!vertices) return; if (!vertices) return;
_keystone->compute3DPositions(osg::DisplaySettings::instance().get(), (*vertices)[0], (*vertices)[1], (*vertices)[2], (*vertices)[3]); osg::Vec2Array* texcoords = dynamic_cast<osg::Vec2Array*>(geometry->getTexCoordArray(0));
if (!texcoords) return;
osg::Vec3 tl, tr, br, bl;
_keystone->compute3DPositions(osg::DisplaySettings::instance().get(), tl, tr, br, bl);
for(unsigned int i=0; i<vertices->size(); ++i)
{
osg::Vec3& v = (*vertices)[i];
osg::Vec2& t = (*texcoords)[i];
v = bl * ((1.0f-t.x())*(1.0f-t.y())) +
br * ((t.x())*(1.0f-t.y())) +
tl * ((1.0f-t.x())*(t.y())) +
tr * ((t.x())*(t.y()));
}
geometry->dirtyBound(); geometry->dirtyBound();
} }
osg::ref_ptr<Keystone> _keystone; osg::ref_ptr<Keystone> _keystone;
}; };
@ -426,19 +440,55 @@ osg::Geometry* createKeystoneDistortionMesh(Keystone* cp)
osg::ref_ptr<osg::Vec3Array> vertices = new osg::Vec3Array; osg::ref_ptr<osg::Vec3Array> vertices = new osg::Vec3Array;
geometry->setVertexArray(vertices.get()); geometry->setVertexArray(vertices.get());
unsigned int vi = vertices->size();
vertices->resize(4);
osg::ref_ptr<osg::Vec2Array> texcoords = new osg::Vec2Array; osg::ref_ptr<osg::Vec2Array> texcoords = new osg::Vec2Array;
geometry->setTexCoordArray(0, texcoords.get()); geometry->setTexCoordArray(0, texcoords.get());
#if 1
unsigned int numRows = 7;
unsigned int numColumns = 7;
unsigned int numVertices = numRows*numColumns;
vertices->resize(numVertices);
texcoords->resize(numVertices);
for(unsigned j=0; j<numRows; j++)
{
for(unsigned i=0; i<numColumns; i++)
{
osg::Vec2& t = (*texcoords)[j*numColumns+i];
t.set(static_cast<float>(i)/static_cast<float>(numColumns-1), static_cast<float>(j)/static_cast<float>(numRows-1));
}
}
osg::ref_ptr<osg::DrawElementsUShort> elements = new osg::DrawElementsUShort(GL_TRIANGLES);
geometry->addPrimitiveSet(elements.get());
for(unsigned j=0; j<numRows-1; j++)
{
for(unsigned i=0; i<numColumns-1; i++)
{
unsigned int vi = j*numColumns+i;
elements->push_back(vi+numColumns);
elements->push_back(vi);
elements->push_back(vi+1);
elements->push_back(vi+numColumns);
elements->push_back(vi+1);
elements->push_back(vi+1+numColumns);
}
}
#else
unsigned int vi = vertices->size();
vertices->resize(4);
texcoords->push_back(osg::Vec2(0.0f,1.0f)); texcoords->push_back(osg::Vec2(0.0f,1.0f));
texcoords->push_back(osg::Vec2(1.0f,1.0f)); texcoords->push_back(osg::Vec2(1.0f,1.0f));
texcoords->push_back(osg::Vec2(1.0f,0.0f)); texcoords->push_back(osg::Vec2(1.0f,0.0f));
texcoords->push_back(osg::Vec2(0.0f,0.0f)); texcoords->push_back(osg::Vec2(0.0f,0.0f));
geometry->addPrimitiveSet(new osg::DrawArrays(GL_QUADS, vi, 4)); geometry->addPrimitiveSet(new osg::DrawArrays(GL_QUADS, vi, 4));
#endif
geometry->getOrCreateStateSet()->setMode(GL_LIGHTING, osg::StateAttribute::OFF); geometry->getOrCreateStateSet()->setMode(GL_LIGHTING, osg::StateAttribute::OFF);