main/src/georegression/metric/Intersection3D_F64.java
private static boolean containedPlane( Point3D_F64 T_v0,
										   Point3D_F64 output,
										   Vector3D_F64 u , Vector3D_F64 v ,
										   Vector3D_F64 w0 ) {
		double uu, uv, vv, wu, wv, D;
		uu = u.dot(u);
		uv = u.dot(v);
		vv = v.dot(v);
		w0.minus(output,T_v0);
		wu = w0.dot(u);
		wv = w0.dot(v);
		D = uv * uv - uu * vv;

		// get and test parametric coords
		double s, t;
		s = (uv * wv - vv * wu) / D;
		if (s < 0.0 || s > 1.0)        // I is outside T
			return false;
		t = (uv * wu - uu * wv) / D;
		return !(t < 0.0) && !((s + t) > 1.0);  // I is outside T
	}
private static boolean containedPlane( Point3D_F64 T_v0,
										   Point3D_F64 output,
										   Vector3D_F64 u , Vector3D_F64 v ,
										   Vector3D_F64 w0 ) {
		double uu, uv, vv, wu, wv, D;
		uu = u.dot(u);
		uv = u.dot(v);
		vv = v.dot(v);
		w0.minus(output,T_v0);
		wu = w0.dot(u);
		wv = w0.dot(v);
		D = uv * uv - uu * vv;

		// get and test parametric coords
		double s, t;
		s = (uv * wv - vv * wu) / D;
		if (s < 0.0 || s > 1.0)        // I is outside T
			return false;
		t = (uv * wu - uu * wv) / D;
		return !(t < 0.0) && !((s + t) > 1.0);  // I is outside T
	}
Determines if the point on the same plane as T is contained inside of T.