/*
 *    Copyright 2008 Christian Stussak
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package de.mfo.jsurf.algebra;

import javax.vecmath.*;

public interface GradientCalculator
{
    /**
     * Calculates the surface normal in surface space.
     * @param p Point in surface space.
     * @return Surface normal in surface space.
     */
    public Vector3d calculateGradient( Point3d p );
    
    /**
     * Calculates the surface normal in surface space.
     * @param p Point in surface space.
     * @return Surface normal in surface space.
     */
    public Vector3f calculateGradient( Point3f p );
}
