Function randomDir

Engine/source/math/mathUtils.cpp:255–279

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Point3F randomDir( const Point3F &axis, F32 thetaAngleMin, F32 thetaAngleMax,
                                        F32 phiAngleMin, F32 phiAngleMax )
{
   MatrixF orient = createOrientFromDir( axis );
   Point3F axisx;
   orient.getColumn( 0, &axisx );

   F32 theta = (thetaAngleMax - thetaAngleMin) * sgRandom.randF() + thetaAngleMin;
   F32 phi = (phiAngleMax - phiAngleMin) * sgRandom.randF() + phiAngleMin;

   // Both phi and theta are in degs.  Create axis angles out of them, and create the
   //  appropriate rotation matrix...
   AngAxisF thetaRot(axisx, theta * (M_PI_F / 180.0f));
   AngAxisF phiRot(axis,    phi   * (M_PI_F / 180.0f));

   Point3F ejectionAxis = axis;

   MatrixF temp(true);
   thetaRot.setMatrix(&temp);
   temp.mulP(ejectionAxis);
   phiRot.setMatrix(&temp);
   temp.mulP(ejectionAxis);

   return ejectionAxis;
}

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