Method rotate

tutorials/common/tutorial/camera.h:92–102

    }

    void rotate (float dtheta, float dphi)
    {
      if (handedness == RIGHT_HANDED) dtheta *= -1.0f;
      const Vec3fa up1 = normalize(up);
      Vec3fa view1 = normalize(to-from);
      view1 = xfmVector(AffineSpace3fa::rotate(up1, dtheta), view1);
      const float phi = acosf(dot(view1, up1));
      const float dphi2 = phi - clamp(phi-dphi, 0.001f*float(pi), 0.999f*float(pi));
      view1 = xfmVector(AffineSpace3fa::rotate(cross(view1, up1), dphi2), view1);
      to = from + length(to-from) * view1;
    }

    void rotateOrbit (float dtheta, float dphi)
    {