Emil Dotchevski said: (by the date of Fri, 23 Apr 2010 00:55:33 -0700)
On Fri, Apr 23, 2010 at 12:19 AM, Barend Gehrels <barend@geodan.nl> wrote:
http://www.revergestudios.com/boost-la/ If accepted, we plan to merge vector operations / let them interoperate between geometries.
For Janek's sake, you just define a simple traits type for any vector type, and the generic vector operations in (Boost) LA kick-in automatically.
Last but not least - I am doing frequently a 3D rotation of 3D points using quaternions for that (this could work with rotation matrices too). I suppose that I would need to implement this myself to "link" boost::quaternion with boost::geometry::point3d.
I've also implemented generic quaternion operations in (Boost) LA that kick-in for user-defined types, but I haven't yet published that code because I haven't got a chance to update the documentation. Hopefully soon.
Many thanks for your answers. Currently I have boost 1.42 installed. I can download your libraries and put them in include/ directory (are those include only?). So I can use them. But can they work for me? To answer this, could you tell me how such a "very simple" program using your libraries could look? Full source is in the attachment. (I am using currently some parts of WildMagic 3 library,which is under LGPL license). Here's the simple program (full version in attachment): #include <iostream> #include <string.h> #include "Vector3.hpp" #include "Quaternion.hpp" using namespace std; int main() { Vector3d a,b,c; // declare some 3D vectors a = Vector3d( 0.0 , 0.0 , 1.0 ); // initialize them somehow b = Vector3d( 0.0 , 0.0 , -1.0 ); c = Vector3d( 0.0 , 2.0 , 0.0 ); cout << "\ndeclared 3D vectors:\n"; cout << "a: " << a << "\n"; cout << "b: " << b << "\n"; cout << "c: " << c << "\n"; cout << "a + c: " << a+c << endl; // vector addition test cout << "a x c: " << a.cross(c) << endl; // vector cross product test cout << "a . b: " << a.dot(b) << endl; // vector dot product test Quaterniond q; // declare some quaternion q.align(b,a); // now quaternion q will describe a rotation from vector a to vector b cout << "\nquaternion q (which rotates vector a into vector b): " << q << endl; Vector3d axis; double angle; q.toAxisAngle(axis,angle); // now, represent this rotation q as an axis-angle pair cout << "axis of rotation: " << axis << " angle of rotation: " << angle << endl; cout << "So now, let's rotate a by quaternion q, did we get b from that?\n"; cout << "q*a: " << q*a << endl; cout << "b: " << b << endl; }; // program output: // // declared 3D vectors: // a: 0 0 1 // b: 0 0 -1 // c: 0 2 0 // a + c: 0 2 1 // a x c: -2 0 0 // a . b: -1 // // quaternion q (which rotates vector a into vector b): 0 0 -1 0 // axis of rotation: 0 -1 0 angle of rotation: 3.14159 // So now, let's rotate a by quaternion q, did we get b from that? // q*a: 0 0 -1 // b: 0 0 -1 Once I have figured out how to do above code using boost + your libraries only, I will be very happy to switch to boost entirely. Also - I will be very happy to test your library and submit bug reports or patches, but let's get this simple example to work first. Composing rotations by multiplying quaternions should work too. And normalizing them, conjugating, inverting, etc, but all that is already in boost::quaternion. best regards -- Janek Kozicki http://janek.kozicki.pl/ |