PolyLine3D.java

/*
 * Copyright (C) 2013-2015 F(X)yz, 
 * Sean Phillips, Jason Pollastrini and Jose Pereda
 * All rights reserved.
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
package org.fxyz.shapes.composites;

import java.util.List;
import javafx.scene.AmbientLight;
import javafx.scene.DepthTest;
import javafx.scene.Group;
import javafx.scene.paint.Color;
import javafx.scene.paint.PhongMaterial;
import javafx.scene.shape.CullFace;
import javafx.scene.shape.DrawMode;
import javafx.scene.shape.MeshView;
import javafx.scene.shape.TriangleMesh;
import org.fxyz.geometry.Point3D;

/**
 *
 * @author Sean
 */
public class PolyLine3D extends Group {
    
    public List<Point3D> points;
    public int width = 2;
    public Color color = Color.WHITE;
    private TriangleMesh mesh;
    public MeshView meshView;
    public PhongMaterial material;
    
    public PolyLine3D(List<Point3D> points, int width, Color color) {
        this.points = points;
        this.width = width;
        this.color = color;
        setDepthTest(DepthTest.ENABLE);        
        mesh  = new TriangleMesh();
        //add each point. For each point add another point shifted on Z axis by width
        //This extra point allows us to build triangles later
        for(Point3D point: points) {
            mesh.getPoints().addAll(point.x,point.y,point.z);
            mesh.getPoints().addAll(point.x,point.y,point.z+width);
        }
        //add dummy Texture Coordinate
        mesh.getTexCoords().addAll(0,0); 
        //Now generate trianglestrips for each line segment
        for(int i=2;i<points.size()*2;i+=2) {  //add each segment
            //Vertices wound counter-clockwise which is the default front face of any Triange
            //These triangles live on the frontside of the line facing the camera
            mesh.getFaces().addAll(i,0,i-2,0,i+1,0); //add primary face
            mesh.getFaces().addAll(i+1,0,i-2,0,i-1,0); //add secondary Width face
            //Add the same faces but wind them clockwise so that the color looks correct when camera is rotated
            //These triangles live on the backside of the line facing away from initial the camera
            mesh.getFaces().addAll(i+1,0,i-2,0,i,0); //add primary face
            mesh.getFaces().addAll(i-1,0,i-2,0,i+1,0); //add secondary Width face
        }
        //Need to add the mesh to a MeshView before adding to our 3D scene 
        meshView = new MeshView(mesh);
        meshView.setDrawMode(DrawMode.FILL);  //Fill so that the line shows width
        material = new PhongMaterial(color);
        material.setDiffuseColor(color);
        material.setSpecularColor(color);
        meshView.setMaterial(material); 
        //Make sure you Cull the Back so that no black shows through
        meshView.setCullFace(CullFace.BACK);

        //Add some ambient light so folks can see it
        AmbientLight light = new AmbientLight(Color.WHITE);
        light.getScope().add(meshView);
        getChildren().add(light);
        getChildren().add(meshView);           
    }
}