/*
public b2Mat33()
{
ex = new b2Vec3();
ey = new b2Vec3();
ez = new b2Vec3();
}
*/
/// ruct this matrix using columns.
public b2Mat33(b2Vec3 c1, b2Vec3 c2, b2Vec3 c3)
{
ex = c1;
ey = c2;
ez = c3;
}
cpVect _b2Mul(b2Mat33 A, cpVect v2)
{
b2Vec3 v = new b2Vec3(v2.x, v2.y, 1);
b2Vec3 r = v.x * A.ex + v.y * A.ey + v.z * A.ez;
return new cpVect(r.x, r.y);
}
/// Negate this vector.
public static b2Vec3 operator -(b2Vec3 b)
{
b2Vec3 v = new b2Vec3(-b.x, -b.y, -b.z);
return v;
}
/// Multiply a matrix times a vector.
public b2Vec3 b2Mul(b2Mat33 A, b2Vec3 v)
{
return v.x * A.ex + v.y * A.ey + v.z * A.ez;
}
