class EquivalentMesh extends TexturedMesh {
private MeshHelper mh = null;
public EquivalentMesh(Parent root) {
ArrayList<Node> nodes = new ArrayList<>();
addShapes3D(root, nodes);
transformAndMerge(nodes);
}
// Transform Built-in Shape3Ds to a single TexturedMesh
private void transformAndMerge(ArrayList<Node> nodes) {
nodes.stream().forEach(shape -> {
TriangleMesh tm = null;
if (shape instanceof Sphere) {
Sphere sphere = (Sphere)shape;
SegmentedSphereMesh sm = new SegmentedSphereMesh(sphere.getRadius());
sm.setCenter(new Point3D((float)sphere.getTranslateX(), (float)sphere.getTranslateY(), (float)sphere.getTranslateZ()));
tm = (TriangleMesh)sm.getMesh();
} else if (shape instanceof Cylinder) {
Cylinder cylinder = (Cylinder)shape;
FrustumMesh fm = new FrustumMesh(cylinder.getRadius(), cylinder.getRadius(), cylinder.getHeight());
Affine affine = new Affine();
cylinder.getTransforms().forEach(affine::append);
javafx.geometry.Point3D ini = affine.transform(new javafx.geometry.Point3D(0, cylinder.getHeight()/2, 0));
javafx.geometry.Point3D end = affine.transform(new javafx.geometry.Point3D(0, - cylinder.getHeight()/2, 0));
fm.setAxisOrigin(new Point3D((float)ini.getX(), (float)ini.getY(), (float)ini.getZ()));
fm.setAxisEnd(new Point3D((float)end.getX(), (float)end.getY(), (float)end.getZ()));
fm.setSectionType(TriangleMeshHelper.SectionType.CIRCLE);
tm = (TriangleMesh)fm.getMesh();
} else if (shape instanceof Box) {
Box box = (Box)shape;
CuboidMesh cm = new CuboidMesh(box.getWidth(), box.getHeight(), box.getDepth());
cm.setCenter(new Point3D((float)box.getTranslateX(), (float)box.getTranslateY(), (float)box.getTranslateZ()));
// TODO: apply rotations
tm = (TriangleMesh)cm.getMesh();
} else if (shape instanceof MeshView) {
tm = (TriangleMesh)((MeshView)shape).getMesh();
// TODO: apply transformations
}
if (mh == null) {
mh = new MeshHelper(tm);
} else {
mh.addMesh(new MeshHelper(tm));
}
});
// create single mesh
updateMesh(mh);
}
private void addShapes3D(Parent parent, ArrayList<Node> nodes) {
for (Node node : parent.getChildrenUnmodifiable()) {
if (node instanceof Shape3D) {
nodes.add(node);
}
if (node instanceof Parent) {
addShapes3D((Parent)node, nodes);
}
}
}
@Override
protected void updateMesh() {
// no-op
}
// export to obj and mtl
public void export(String nameFile) {
OBJWriter writer=new OBJWriter((TriangleMesh) getMesh(), nameFile);
writer.setMaterialColor(Color.RED);
writer.exportMesh();
}
}
为了测试它,让我们创建一个简单的场景:
@Override
public void start(Stage primaryStage) {
Sphere sphere = new Sphere(100);
sphere.setMaterial(new PhongMaterial(Color.BLUE));
Box box = new Box(50,50,50);
box.setMaterial(new PhongMaterial(Color.RED));
box.setTranslateX(300);
Cylinder cylinder = new Cylinder(2, 300);
cylinder.setMaterial(new PhongMaterial(Color.GREEN));
// Transformations applied:
cylinder.getTransforms().addAll(new Translate(150, 0, 0), new Rotate(90, Rotate.Z_AXIS));
Group group = new Group(cylinder, sphere, box);
StackPane root = new StackPane(group);
Scene scene = new Scene(root, 600, 400);
primaryStage.setScene(scene);
primaryStage.show();
// export as single mesh
EquivalentMesh equivalentMesh = new EquivalentMesh(root);
equivalentMesh.export("group");
}
# 1 楼答案
使用内置
Shape3D
节点(如Sphere
、Cylinder
或Box
)时的主要问题是这些节点不公开它们的TriangleMesh
如果需要该网格,有几个选项:
Shape3D
节点,但在导出它们之前,请将它们从FXyz库转换为等效形状,以便可以访问它们的网格李>在导出模型方面,FXyz中当前的
ObjWriter
一次只导出一个网格,因此您可以:MeshHelper
创建单个网格(只能应用一种材质),然后将其导出到单个网格。obj文件李>在这两种情况下,我将假设第三种情况,根据场景中找到的所有3D形状创建一个新的
TexturedMesh
对象。这将有一个可以导出到obj文件的网格。请注意,您需要FXyzLib.jar
为了测试它,让我们创建一个简单的场景:
请注意,通过创建
EquivalentMesh
的新实例,现在我们有了一个网格,可以将其导出,生成group.obj
和group.mtl
文件最后,使用3DViewer导入obj文件,您将得到以下结果: