Hi Allen,
On Mon, 2005-06-27 at 11:04 -0500, Allen Bierbaum wrote:
> How does makeExtrusionGeo work?
see http://www.web3d.org/x3d/specifications/ISO-IEC-19775-IS-
X3DAbstractSpecification/Part01/components/geometry3D.html#Extrusion
> Or more specifically:
>
> If I have some "flat" geometry in OpenSG and I would like to extrude it
> "back" a few units to get a 3D version of the geometry, can I use
> makeExtrusionGeo to do this?
Not directly from the Geometry, but it's pretty simple.
> A simple example that may help is: If I had the corners of a 2D square
> and I wanted to extrude this into a 3D box, what would the code look like?
Like this:
NodePtr extrudeOutline(std::vector<Pnt2f>& outline, Real32 distance)
{
std::vector<Pnt3f> spine;
std::vector<Quaternion> orientation;
std::vector<Vec2f> scale;
spine.push_back(Pnt3f(0,0,0));
spine.push_back(Pnt3f(0,0,-distance));
orientation.push_back(Quaternion());
orientation.push_back(Quaternion());
scale.push_back(Vec2f(1,1));
scale.push_back(Vec2f(1,1));
GeometryPtr geo = makeExtrusionGeo(
outline,
orientation,
scale,
spine,
0.f,
true, // bool _beginCap
true, // bool _endCap
false, // bool _ccw
true, // bool _convex
true, // bool _buildNormal
true, // bool _buildTexCoord
0); // UInt32 _numOfSubdivision
beginEditCP(geo);
geo->setMaterial(getDefaultMaterial());
endEditCP(geo);
return makeNodeFor(geo);
}
section.push_back(Pnt2f(-1,-1));
section.push_back(Pnt2f(1,-1));
section.push_back(Pnt2f(1,1));
section.push_back(Pnt2f(-1,1));
section.push_back(Pnt2f(-1,-1));
obj = extrudeOutline(section, 2);
Hope it helps
Dirk
--
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