问题
我想将漫反射贴图应用于MeshView。当我将带有漫反射贴图的材质应用于MeshView时,它不可见。然而,应用于Box的相同材料是可见的。
问题
如何将漫反射贴图应用于MeshView?
代码
代码生成带有随机噪声的图像。该图像用作PhongMaterial中的漫反射贴图。显示图像,在其上方是应用了材料的框,在框上方是应用了材质的MeshView(金字塔)。金字塔上的材料不可见。您可以使用鼠标拖动进行旋转。
import java.util.Random;
import javafx.application.Application;
import javafx.geometry.Point3D;
import javafx.scene.Group;
import javafx.scene.PerspectiveCamera;
import javafx.scene.Scene;
import javafx.scene.SceneAntialiasing;
import javafx.scene.image.Image;
import javafx.scene.image.ImageView;
import javafx.scene.image.PixelWriter;
import javafx.scene.image.WritableImage;
import javafx.scene.layout.StackPane;
import javafx.scene.paint.Color;
import javafx.scene.paint.PhongMaterial;
import javafx.scene.shape.Box;
import javafx.scene.shape.DrawMode;
import javafx.scene.shape.MeshView;
import javafx.scene.shape.TriangleMesh;
import javafx.scene.transform.Rotate;
import javafx.stage.Stage;
public class Test extends Application {
private double mousePosX, mousePosY;
private double mouseOldX, mouseOldY;
private final Rotate rotateX = new Rotate(20, Rotate.X_AXIS);
private final Rotate rotateY = new Rotate(-45, Rotate.Y_AXIS);
@Override
public void start(Stage primaryStage) {
// cube
Group group = new Group();
// size of the cube
double size = 400;
group.getTransforms().addAll(rotateX, rotateY);
Image diffuseMap = createImage( size);
// show noise image
ImageView iv = new ImageView( diffuseMap);
iv.setTranslateX(-0.5*size);
iv.setTranslateY(-0.20*size);
iv.setRotate(90);
iv.setRotationAxis(new Point3D(1,0,0));
group.getChildren().add( iv);
// create material out of the noise image
PhongMaterial material = new PhongMaterial();
material.setDiffuseMap(diffuseMap);
// create box with noise diffuse map
Box box = new Box( 100,100,100);
box.setMaterial(material);
group.getChildren().add( box);
// create pyramid with diffuse map
float h = 150; // Height
float s = 150; // Side
TriangleMesh pyramidMesh = new TriangleMesh();
pyramidMesh.getTexCoords().addAll(1,1,1,0,0,1,0,0);
pyramidMesh.getPoints().addAll(
0, 0, 0, // Point 0 - Top
0, h, -s/2, // Point 1 - Front
-s/2, h, 0, // Point 2 - Left
s/2, h, 0, // Point 3 - Back
0, h, s/2 // Point 4 - Right
);
pyramidMesh.getFaces().addAll(
0,0, 2,0, 1,0, // Front left face
0,0, 1,0, 3,0, // Front right face
0,0, 3,0, 4,0, // Back right face
0,0, 4,0, 2,0, // Back left face
4,0, 1,0, 2,0, // Bottom rear face
4,0, 3,0, 1,0 // Bottom front face
);
MeshView pyramid = new MeshView(pyramidMesh);
pyramid.setDrawMode(DrawMode.FILL);
pyramid.setTranslateY(-250);
// apply material
// TODO: why is the diffuse map not displayed?
pyramid.setMaterial(material);
group.getChildren().add(pyramid);
// scene
StackPane root = new StackPane();
root.getChildren().add(group);
Scene scene = new Scene(root, 1600, 900, true, SceneAntialiasing.BALANCED);
scene.setCamera(new PerspectiveCamera());
// interaction listeners
scene.setOnMousePressed(me -> {
mouseOldX = me.getSceneX();
mouseOldY = me.getSceneY();
});
scene.setOnMouseDragged(me -> {
mousePosX = me.getSceneX();
mousePosY = me.getSceneY();
rotateX.setAngle(rotateX.getAngle()-(mousePosY - mouseOldY));
rotateY.setAngle(rotateY.getAngle()+(mousePosX - mouseOldX));
mouseOldX = mousePosX;
mouseOldY = mousePosY;
});
primaryStage.setResizable(false);
primaryStage.setScene(scene);
primaryStage.show();
}
/**
* Create image with random noise
*/
public Image createImage( double size) {
Random rnd = new Random();
int width = (int) size;
int height = (int) size;
WritableImage wr = new WritableImage(width, height);
PixelWriter pw = wr.getPixelWriter();
for (int x = 0; x < width; x++) {
for (int y = 0; y < height; y++) {
Color color = Color.rgb(rnd.nextInt( 256), rnd.nextInt( 256), rnd.nextInt( 256));
pw.setColor(x, y, color);
}
}
return wr;
}
public static void main(String[] args) {
launch(args);
}
}
截图
非常感谢您的帮助!
答案 0 :(得分:4)
此形状由6个单一形状组成。四个三角形都在A点相遇。 底部有一个矩形,因为它们是三角形,你需要两个三角形来创建一个矩形。下图显示了该形状的俯视图。
如您所见,我们有5分。所以他们必须被添加到TriangleMesh的点。一点由三个浮点值(x,y,z)组成。所以这个数组总是由3,6,9,...,15等大小组成。
如果您将图像作为网格的材质(就像您一样),则必须获取纹理坐标并将图像坐标添加到它们。但是你在这里添加什么?这些是您要设置为素材的图像的2D坐标。它以(0.0,0.0)(u0,v0)开始,然后上升到(1.0,1.0)(u1,v1)。它是您要在3D网格上显示的图像片段的2D坐标。由于你只有一个嘈杂的图像,你可以做0,0到1,1但你需要3点三角形。
现在你必须面对面。这就像你想要在你的形状线之间的空间放置一些板块。正如您已经看到的,您必须为三角形添加四个部分,为底部添加两个部分。
饰面是六个值的元组。因为我们正在绘制三角形,所以总是这样:从点到点,再到点。所以元组由6个值组成。 p0,t0,p1,t1,p2,t2。这些值是点和纹理数组的索引。 p0指向点数组的第一个树元组,t0指向纹理坐标数组的前两个元组。
也许我的解释不完全正确,但这就是我理解它的方式:
JavaFX的默认摄像头是逆时针方向,因此如果您以逆时针方向放置面部,则相机可以看到面部正面。面部不支持,这是在JavaFX内部完成的,用于解决性能问题。只要您不将剔除设置为背面,背面就不会使用任何材质进行渲染。
要查看此三角形的底部,相机必须更改其视角,因此它是顺时针方向。脸部正面和背面都是一样的。
在你的例子中,我已经命名了这些点,因为现在你可以看到我首先渲染了哪些面,最后是哪一面。例如:
ABC是我的第一张脸,它是A,B和C点之间的三角形。这些点从材质图像坐标中获取纹理。
有关这些内容的更多信息,请访问JoséPereda的博客:http://jperedadnr.blogspot.de/2015/01/creating-and-texturing-javafx-3d-shapes.html
希望你能理解所有内容,然后在下面找到我的解决方案。
import java.util.Random;
import javafx.application.Application;
import javafx.geometry.Point3D;
import javafx.scene.Group;
import javafx.scene.PerspectiveCamera;
import javafx.scene.Scene;
import javafx.scene.SceneAntialiasing;
import javafx.scene.image.Image;
import javafx.scene.image.ImageView;
import javafx.scene.image.PixelWriter;
import javafx.scene.image.WritableImage;
import javafx.scene.layout.StackPane;
import javafx.scene.paint.Color;
import javafx.scene.paint.PhongMaterial;
import javafx.scene.shape.Box;
import javafx.scene.shape.DrawMode;
import javafx.scene.shape.MeshView;
import javafx.scene.shape.TriangleMesh;
import javafx.scene.transform.Rotate;
import javafx.stage.Stage;
public class Test extends Application {
private double mousePosX, mousePosY;
private double mouseOldX, mouseOldY;
private final Rotate rotateX = new Rotate(20, Rotate.X_AXIS);
private final Rotate rotateY = new Rotate(-45, Rotate.Y_AXIS);
@Override
public void start(Stage primaryStage) {
// cube
Group group = new Group();
// size of the cube
double size = 400;
group.getTransforms().addAll(rotateX, rotateY);
Image diffuseMap = createImage(size);
// show noise image
ImageView iv = new ImageView(diffuseMap);
iv.setTranslateX(-0.5 * size);
iv.setTranslateY(-0.20 * size);
iv.setRotate(90);
iv.setRotationAxis(new Point3D(1, 0, 0));
group.getChildren().add(iv);
// create material out of the noise image
PhongMaterial material = new PhongMaterial();
material.setDiffuseMap(diffuseMap);
// create box with noise diffuse map
Box box = new Box(100, 100, 100);
box.setMaterial(material);
group.getChildren().add(box);
// create pyramid with diffuse map
float h = 150; // Height
float s = 150; // Side
float hs = s / 2;
// coordinates of the mapped image
float x0 = 0.0f;
float y0 = 0.0f;
float x1 = 1.0f;
float y1 = 1.0f;
TriangleMesh pyramidMesh = new TriangleMesh();
pyramidMesh.getPoints().addAll( //
0.0f, 0.0f, 0.0f, // A 0 Top of Pyramid
hs, h, -hs, // B 1
hs, h, hs, // C 2
-hs, h, hs, // D 3
-hs, h, -hs // E 4
);
pyramidMesh.getTexCoords().addAll( //
x0, y0, // 0
x0, y1, // 1
x1, y0, // 2
x1, y1 // 3
);
pyramidMesh.getFaces().addAll(// index of point, index of texture, index of point, index of texture, index of point, index of texture
0, 0, 1, 1, 2, 3, // ABC (counter clockwise)
0, 0, 2, 1, 3, 3, // ACD (counter clockwise)
0, 0, 3, 1, 4, 3, // ADE (counter clockwise)
0, 0, 4, 1, 1, 3, // AEB (counter clockwise)
4, 0, 3, 1, 2, 3, // EDC (Bottom first triangle clock wise)
2, 0, 1, 1, 4, 3 // CBE (Bottom second triangle clock wise)
);
MeshView pyramid = new MeshView();
pyramid.setMesh(pyramidMesh);
pyramid.setDrawMode(DrawMode.FILL);
pyramid.setTranslateY(-250);
// apply material
// TODO: why is the diffuse map not displayed?
pyramid.setMaterial(material);
group.getChildren().add(pyramid);
// scene
StackPane root = new StackPane();
root.getChildren().add(group);
Scene scene = new Scene(root, 1600, 900, true, SceneAntialiasing.BALANCED);
scene.setCamera(new PerspectiveCamera());
// interaction listeners
scene.setOnMousePressed(me -> {
mouseOldX = me.getSceneX();
mouseOldY = me.getSceneY();
});
scene.setOnMouseDragged(me -> {
mousePosX = me.getSceneX();
mousePosY = me.getSceneY();
rotateX.setAngle(rotateX.getAngle() - (mousePosY - mouseOldY));
rotateY.setAngle(rotateY.getAngle() + (mousePosX - mouseOldX));
mouseOldX = mousePosX;
mouseOldY = mousePosY;
});
primaryStage.setResizable(false);
primaryStage.setScene(scene);
primaryStage.show();
}
/**
* Create image with random noise
*/
public Image createImage(double size) {
Random rnd = new Random();
int width = (int) size;
int height = (int) size;
WritableImage wr = new WritableImage(width, height);
PixelWriter pw = wr.getPixelWriter();
for (int x = 0; x < width; x++) {
for (int y = 0; y < height; y++) {
Color color = Color.rgb(rnd.nextInt(256), rnd.nextInt(256), rnd.nextInt(256));
pw.setColor(x, y, color);
}
}
return wr;
}
public static void main(String[] args) {
launch(args);
}
}