Java Reference
In-Depth Information
The mapping of the points on the surface to a point on the images is the job of the
TriangleMesh
. We built a
MeshView
with a user-defined
TriangleMesh
earlier in this chapter. In fact, the predefined 3D shapes are also based
on
TriangleMesh
es internally. Therefore they are also capable of being texturized. Recall that in
TriangleMesh
, each
face is defined by six indices:
p0
,
t0
,
p1
,
t1
,
p2
,
t2
, where
p0
,
p1
,
p2
are indices into the points array, and
t0
,
t1
,
t2
are
indices into the
texCoords
array. Looking up the
texCoords
array with
t0
,
t1
,
t2
we get the (
u0
,
v0
), (
u1
,
v1
), and (
u2
,
v2
) coordinates. The triangular portion of the image determined by these three coordinates is mapped to the face of
the 3D shape.
In the program in Listing 10-8, we use a world map image as the
diffuseMap
of a sphere to make a globe.
Listing 10-8.
EarthSphere.java
import javafx.application.Application;
import javafx.beans.property.DoubleProperty;
import javafx.beans.property.SimpleDoubleProperty;
import javafx.scene.Group;
import javafx.scene.PerspectiveCamera;
import javafx.scene.PointLight;
import javafx.scene.Scene;
import javafx.scene.image.Image;
import javafx.scene.input.MouseEvent;
import javafx.scene.paint.Color;
import javafx.scene.paint.PhongMaterial;
import javafx.scene.shape.Sphere;
import javafx.scene.transform.Rotate;
import javafx.stage.Stage;
public class EarthSphere extends Application {
double anchorX, anchorY;
private double anchorAngleX = 0;
private double anchorAngleY = 0;
private final DoubleProperty angleX = new SimpleDoubleProperty(0);
private final DoubleProperty angleY = new SimpleDoubleProperty(0);
PerspectiveCamera scenePerspectiveCamera = new PerspectiveCamera(false);
public static void main(String[] args) {
launch(args);
}
@Override
public void start(Stage stage) {
stage.setTitle("EarthSphere");
Image diffuseMap = new Image(EarthSphere.class
.getResource("earth-mercator.jpg")
.toExternalForm());
PhongMaterial earthMaterial = new PhongMaterial();
earthMaterial.setDiffuseMap(diffuseMap);
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