Hi,
I am trying to draw a shape that is basically a hollow box with a tick mark on
one side extending into the center (screenshot attached). I attempted to do it
by drawing QUAD_STRIPS for the outer and inner faces, and QUADS for the top and
bottom faces. My problem is, seams are clearly visible on the top of the model
where the quads join together. At first I thought I made a mistake with the
normal vectors, but I double checked them and I think the math is correct. Is
there a better way to accomplish what I am trying to do?
Here's the code:
Code:
osg::Node* drawModel() {
osg::Geode *myGeode = new osg::Geode;
osg::Geometry *myGeom = new osg::Geometry;
myGeode->addDrawable(myGeom);
// VERTICES
osg::ref_ptr<osg::Vec3Array> vertices = new osg::Vec3Array;
// sides
vertices->push_back( osg::Vec3( -1.0, -1.0, 0.0));
vertices->push_back( osg::Vec3( -1.0, -1.0, 0.1));
vertices->push_back( osg::Vec3( 1.0, -1.0, 0.0));
vertices->push_back( osg::Vec3( 1.0, -1.0, 0.1));
vertices->push_back( osg::Vec3( 1.0, 1.0, 0.0));
vertices->push_back( osg::Vec3( 1.0, 1.0, 0.1));
vertices->push_back( osg::Vec3( -1.0, 1.0, 0.0));
vertices->push_back( osg::Vec3( -1.0, 1.0, 0.1));
vertices->push_back( osg::Vec3( -1.0, -1.0, 0.0));
vertices->push_back( osg::Vec3( -1.0, -1.0, 0.1));
// top face
vertices->push_back( osg::Vec3( -1.0, -1.0, 0.1));
vertices->push_back( osg::Vec3( -1.0, 1.0, 0.1));
vertices->push_back( osg::Vec3( -0.8, 1.0, 0.1));
vertices->push_back( osg::Vec3( -0.8, -1.0, 0.1));
vertices->push_back( osg::Vec3( -0.8, 0.8, 0.1));
vertices->push_back( osg::Vec3( -0.8, 1.0, 0.1));
vertices->push_back( osg::Vec3( 0.8, 1.0, 0.1));
vertices->push_back( osg::Vec3( 0.8, 0.8, 0.1));
vertices->push_back( osg::Vec3( 0.8, 1.0, 0.1));
vertices->push_back( osg::Vec3( 1.0, 1.0, 0.1));
vertices->push_back( osg::Vec3( 1.0, -1.0, 0.1));
vertices->push_back( osg::Vec3( 0.8, -1.0, 0.1));
vertices->push_back( osg::Vec3( -0.8, -1.0, 0.1));
vertices->push_back( osg::Vec3( -0.8, -0.8, 0.1));
vertices->push_back( osg::Vec3( 0.8, -0.8, 0.1));
vertices->push_back( osg::Vec3( 0.8, -1.0, 0.1));
vertices->push_back( osg::Vec3( -0.1, -0.8, 0.1));
vertices->push_back( osg::Vec3( -0.1, 0.0, 0.1));
vertices->push_back( osg::Vec3( 0.1, 0.0, 0.1));
vertices->push_back( osg::Vec3( 0.1, -0.8, 0.1));
// bottom face
vertices->push_back( osg::Vec3( -1.0, -1.0, 0.0));
vertices->push_back( osg::Vec3( -1.0, 1.0, 0.0));
vertices->push_back( osg::Vec3( -0.8, 1.0, 0.0));
vertices->push_back( osg::Vec3( -0.8, -1.0, 0.0));
vertices->push_back( osg::Vec3( -0.8, 0.8, 0.0));
vertices->push_back( osg::Vec3( -0.8, 1.0, 0.0));
vertices->push_back( osg::Vec3( 0.8, 1.0, 0.0));
vertices->push_back( osg::Vec3( 0.8, 0.8, 0.0));
vertices->push_back( osg::Vec3( 0.8, 1.0, 0.0));
vertices->push_back( osg::Vec3( 1.0, 1.0, 0.0));
vertices->push_back( osg::Vec3( 1.0, -1.0, 0.0));
vertices->push_back( osg::Vec3( 0.8, -1.0, 0.0));
vertices->push_back( osg::Vec3( -0.8, -1.0, 0.0));
vertices->push_back( osg::Vec3( -0.8, -0.8, 0.0));
vertices->push_back( osg::Vec3( 0.8, -0.8, 0.0));
vertices->push_back( osg::Vec3( 0.8, -1.0, 0.0));
vertices->push_back( osg::Vec3( -0.1, -0.8, 0.0));
vertices->push_back( osg::Vec3( -0.1, 0.0, 0.0));
vertices->push_back( osg::Vec3( 0.1, 0.0, 0.0));
vertices->push_back( osg::Vec3( 0.1, -0.8, 0.0));
// inner faces
vertices->push_back( osg::Vec3( -0.8, -0.8, 0.0));
vertices->push_back( osg::Vec3( -0.8, -0.8, 0.1));
vertices->push_back( osg::Vec3( -0.8, 0.8, 0.0));
vertices->push_back( osg::Vec3( -0.8, 0.8, 0.1));
vertices->push_back( osg::Vec3( 0.8, 0.8, 0.0));
vertices->push_back( osg::Vec3( 0.8, 0.8, 0.1));
vertices->push_back( osg::Vec3( 0.8, -0.8, 0.0));
vertices->push_back( osg::Vec3( 0.8, -0.8, 0.1));
vertices->push_back( osg::Vec3( 0.1, -0.8, 0.0));
vertices->push_back( osg::Vec3( 0.1, -0.8, 0.1));
vertices->push_back( osg::Vec3( 0.1, 0.0, 0.0));
vertices->push_back( osg::Vec3( 0.1, 0.0, 0.1));
vertices->push_back( osg::Vec3( -0.1, 0.0, 0.0));
vertices->push_back( osg::Vec3( -0.1, 0.0, 0.1));
vertices->push_back( osg::Vec3( -0.1, -0.8, 0.0));
vertices->push_back( osg::Vec3( -0.1, -0.8, 0.1));
vertices->push_back( osg::Vec3( -0.8, -0.8, 0.0));
vertices->push_back( osg::Vec3( -0.8, -0.8, 0.1));
myGeom->setVertexArray(vertices);
myGeom->addPrimitiveSet(new osg::DrawArrays(
osg::PrimitiveSet::QUAD_STRIP, 0, 10 ));
myGeom->addPrimitiveSet(new osg::DrawArrays( osg::PrimitiveSet::QUADS,
10, 40 ));
myGeom->addPrimitiveSet(new osg::DrawArrays(
osg::PrimitiveSet::QUAD_STRIP, 50, 18 ));
// NORMALS
osg::ref_ptr<osg::Vec3Array> normals = new osg::Vec3Array;
// sides
normals->push_back(osg::Vec3( -1.0, -1.0, -1.0));
normals->push_back(osg::Vec3( -1.0, -1.0, 1.0));
normals->push_back(osg::Vec3( 1.0, -1.0, -1.0));
normals->push_back(osg::Vec3( 1.0, -1.0, 1.0));
normals->push_back(osg::Vec3( 1.0, 1.0, -1.0));
normals->push_back(osg::Vec3( 1.0, 1.0, 1.0));
normals->push_back(osg::Vec3( -1.0, 1.0, -1.0));
normals->push_back(osg::Vec3( -1.0, 1.0, 1.0));
normals->push_back(osg::Vec3( -1.0, -1.0, -1.0));
normals->push_back(osg::Vec3( -1.0, -1.0, 1.0));
// top face
normals->push_back(osg::Vec3( -1.0, -1.0, 1.0));
normals->push_back(osg::Vec3( -1.0, 1.0, 1.0));
normals->push_back(osg::Vec3( 0.0, 1.0, 2.0));
normals->push_back(osg::Vec3( 0.0, -1.0, 2.0));
normals->push_back(osg::Vec3( 1.0, -1.0, 1.0));
normals->push_back(osg::Vec3( 0.0, 1.0, 2.0));
normals->push_back(osg::Vec3( 0.0, 1.0, 2.0));
normals->push_back(osg::Vec3( -1.0, -1.0, 1.0));
normals->push_back(osg::Vec3( 0.0, 1.0, 2.0));
normals->push_back(osg::Vec3( 1.0, 1.0, 1.0));
normals->push_back(osg::Vec3( 1.0, -1.0, 1.0));
normals->push_back(osg::Vec3( 0.0, -1.0, 2.0));
normals->push_back(osg::Vec3( 0.0, -1.0, 2.0));
normals->push_back(osg::Vec3( 1.0, 1.0, 1.0));
normals->push_back(osg::Vec3( -1.0, 1.0, 1.0));
normals->push_back(osg::Vec3( 0.0, -1.0, 2.0));
normals->push_back(osg::Vec3( -1.0, 1.0, 2.0));
normals->push_back(osg::Vec3( -1.0, 1.0, 1.0));
normals->push_back(osg::Vec3( 1.0, 1.0, 1.0));
normals->push_back(osg::Vec3( 1.0, 1.0, 2.0));
// bottom face
normals->push_back(osg::Vec3( -1.0, -1.0, -1.0));
normals->push_back(osg::Vec3( -1.0, 1.0, -1.0));
normals->push_back(osg::Vec3( 0.0, 1.0, -2.0));
normals->push_back(osg::Vec3( 0.0, -1.0, -2.0));
normals->push_back(osg::Vec3( 1.0, -1.0, -1.0));
normals->push_back(osg::Vec3( 0.0, 1.0, -2.0));
normals->push_back(osg::Vec3( 0.0, 1.0, -2.0));
normals->push_back(osg::Vec3( -1.0, -1.0, -1.0));
normals->push_back(osg::Vec3( 0.0, 1.0, -2.0));
normals->push_back(osg::Vec3( 1.0, 1.0, -1.0));
normals->push_back(osg::Vec3( 1.0, -1.0, -1.0));
normals->push_back(osg::Vec3( 0.0, -1.0, -2.0));
normals->push_back(osg::Vec3( 0.0, -1.0, -2.0));
normals->push_back(osg::Vec3( 1.0, 1.0, -1.0));
normals->push_back(osg::Vec3( -1.0, 1.0, -1.0));
normals->push_back(osg::Vec3( 0.0, -1.0, -2.0));
normals->push_back(osg::Vec3( -1.0, 1.0, -2.0));
normals->push_back(osg::Vec3( -1.0, 1.0, -1.0));
normals->push_back(osg::Vec3( 1.0, 1.0, -1.0));
normals->push_back(osg::Vec3( 1.0, 1.0, -2.0));
// inner faces
normals->push_back(osg::Vec3( 1.0, 1.0, -2.0));
normals->push_back(osg::Vec3( 1.0, 1.0, 2.0));
normals->push_back(osg::Vec3( 1.0, -1.0, -2.0));
normals->push_back(osg::Vec3( 1.0, -1.0, 2.0));
normals->push_back(osg::Vec3( -1.0, -1.0, -2.0));
normals->push_back(osg::Vec3( -1.0, -1.0, 2.0));
normals->push_back(osg::Vec3( -1.0, 1.0, -2.0));
normals->push_back(osg::Vec3( -1.0, 1.0, 2.0));
normals->push_back(osg::Vec3( 1.0, 1.0, -2.0));
normals->push_back(osg::Vec3( 1.0, 1.0, 2.0));
normals->push_back(osg::Vec3( 1.0, 1.0, -1.0));
normals->push_back(osg::Vec3( 1.0, 1.0, 1.0));
normals->push_back(osg::Vec3( -1.0, 1.0, -1.0));
normals->push_back(osg::Vec3( -1.0, 1.0, 1.0));
normals->push_back(osg::Vec3( -1.0, 1.0, -2.0));
normals->push_back(osg::Vec3( -1.0, 1.0, 2.0));
normals->push_back(osg::Vec3( 1.0, 1.0, -2.0));
normals->push_back(osg::Vec3( 1.0, 1.0, 2.0));
for (unsigned int i = 0; i < normals->getNumElements(); i++)
{
(*normals)[i].normalize();
}
myGeom->setNormalArray(normals);
myGeom->setNormalBinding(osg::Geometry::BIND_PER_VERTEX);
osg::ref_ptr<osg::Vec4Array> colors = new osg::Vec4Array;
colors->push_back( osg::Vec4(1.0, 1.0, 1.0, 1.0));
myGeom->setColorArray(colors);
myGeom->setColorBinding(osg::Geometry::BIND_OVERALL);
return myGeode;
}
I also included the .osg file for reference.
...
Thank you!
Cheers,
Michael
------------------
Read this topic online here:
http://forum.openscenegraph.org/viewtopic.php?p=48052#48052
Attachments:
http://forum.openscenegraph.org//files/model_491.osg
http://forum.openscenegraph.org//files/model_148.jpg
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