我希望有人能帮我解决这个问题。
我正在使用javafx和三角形网格来构建一个由三角形组成的球状对象(如足球)。形状的不同瓦片是通过颜色区分的,但我想在瓦片之间添加线条。就像这个橄榄球:
javafx提供的2D行在3D空间中带来了糟糕的性能。因此,我找到了提供PolyLine3D的FXyzLib。这实际上只是在3D空间中创建一条线的另一个三角形网格。
有了这个,我就可以创建3D线了。但是,如果我想将它们添加到我的原始三角形网格中,其他所有东西都会变成黑色。这也是另一种方式。我用提供的Libary找到的here示例进行了试验。它创建了一条奇特的3D线条,但当我试图将一个简单的红色球体添加到场景中时,球体是黑色的,就像这样:
。
我不是这方面的专家,也不是javafx的新手,在PolyLine3D的代码中也找不到这个问题。在场景中添加多个三角形网格应该不是问题。有没有一些我不知道的光线或相机效果?
编辑:我解决了这个问题。Polyline3D中使用的环境光导致了问题。如果你为你的其他物体添加灯光,应该没问题。
发布于 2018-09-29 21:03:50
虽然将多个三角形网格添加到场景中没有任何错误,但当您想要创建一个类似于足球图片的网格时,有一种更简单的方法,这样您就可以高亮显示一些边,而不是网格中的所有三角形。
它可以用一个PolygonMesh
来完成,它接受任何有效的闭合多边形作为面。
这个实现已经存在于3DViewer项目中,该项目是开源的,可以在here中找到。有一个可以呈现PolygonMesh
的PolygonMeshView
控件。
请注意,如果您仅在项目中使用这两个类,则现在必须跳过细分网格。
这个answer已经使用了一个四边形网格来渲染一个没有三角形网格对角边的长方体。
在引擎盖下,多边形网格使用三角形网格,并在内部将您提供的多边形转化为三角形。
截断二十面体网格
所以我们可以做一些类似的事情来生成的网格,这是我们可以用来生成简化足球模型的几何图形的名称。
它有12个正五角形面,20个正六角形面和60个顶点。
我们需要这些顶点的3D坐标,纹理的2D坐标,以及32个面中每个面的顶点和纹理的索引。
我使用了免费的在线沙盒WolframCloud resource来检索这些值。
例如,您可以运行:
Flatten[PolyhedronData["TruncatedIcosahedron","VertexCoordinates"]//N]
要获取顶点坐标列表,请执行以下操作:
Out[1]= {-0.16246,-2.11803,1.27598,-0.16246,2.11803,...}
并且,你可以得到这些面孔:
PolyhedronData["TruncatedIcosahedron","FaceIndices"]
Out[2]= {{53,11,24,23,9},{51,39,40,52,30},...}
最后,您需要纹理坐标和索引,它们可以通过icosahedron的网络进行检索
PolyhedronData["TruncatedIcosahedron","Net"]
PolyhedronData["TruncatedIcosahedron","NetCoordinates"]
在本例中,您将获得32个面的2D坐标。假设我们希望所有的五边形和六边形都有相同的纹理,我已经对这些坐标进行了一些处理,得到了这个纹理图像:
仅有9个顶点及其坐标(在JavaFX坐标系中)。
此方法包含创建网格所需的信息:
private PolygonMesh getTruncatedIcosahedron() {
float[] points = new float[]{
-0.16246f,-2.11803f,1.27598f, -0.16246f,2.11803f,1.27598f,
0.16246f,-2.11803f,-1.27598f, 0.16246f,2.11803f,-1.27598f,
-0.262866f,-0.809017f,-2.32744f, -0.262866f,-2.42705f,-0.425325f,
-0.262866f,0.809017f,-2.32744f, -0.262866f,2.42705f,-0.425325f,
0.262866f,-0.809017f,2.32744f, 0.262866f,-2.42705f,0.425325f,
0.262866f,0.809017f,2.32744f, 0.262866f,2.42705f,0.425325f,
0.688191f,-0.5f,-2.32744f, 0.688191f,0.5f,-2.32744f,
1.21392f,-2.11803f,0.425325f, 1.21392f,2.11803f,0.425325f,
-2.06457f,-0.5f,1.27598f, -2.06457f,0.5f,1.27598f,
-1.37638f,-1.f,1.80171f, -1.37638f,1.f,1.80171f,
-1.37638f,-1.61803f,-1.27598f, -1.37638f,1.61803f,-1.27598f,
-0.688191f,-0.5f,2.32744f, -0.688191f,0.5f,2.32744f,
1.37638f,-1.f,-1.80171f, 1.37638f,1.f,-1.80171f,
1.37638f,-1.61803f,1.27598f, 1.37638f,1.61803f,1.27598f,
-1.7013f,0.f,-1.80171f, 1.7013f,0.f,1.80171f,
-1.21392f,-2.11803f,-0.425325f, -1.21392f,2.11803f,-0.425325f,
-1.96417f,-0.809017f,-1.27598f, -1.96417f,0.809017f,-1.27598f,
2.06457f,-0.5f,-1.27598f, 2.06457f,0.5f,-1.27598f,
2.22703f,-1.f,-0.425325f, 2.22703f,1.f,-0.425325f,
2.38949f,-0.5f,0.425325f, 2.38949f,0.5f,0.425325f,
-1.11352f,-1.80902f,1.27598f, -1.11352f,1.80902f,1.27598f,
1.11352f,-1.80902f,-1.27598f, 1.11352f,1.80902f,-1.27598f,
-2.38949f,-0.5f,-0.425325f, -2.38949f,0.5f,-0.425325f,
-1.63925f,-1.80902f,0.425325f, -1.63925f,1.80902f,0.425325f,
1.63925f,-1.80902f,-0.425325f, 1.63925f,1.80902f,-0.425325f,
1.96417f,-0.809017f,1.27598f, 1.96417f,0.809017f,1.27598f,
0.850651f,0.f,2.32744f, -2.22703f,-1.f,0.425325f,
-2.22703f,1.f,0.425325f, -0.850651f,0.f,-2.32744f,
-0.525731f,-1.61803f,-1.80171f, -0.525731f,1.61803f,-1.80171f,
0.525731f,-1.61803f,1.80171f, 0.525731f,1.61803f,1.80171f};
float[] texCoords = new float[]{0.904508f,0.820298f, 0.75f,0.529535f, 0.25f,0.529535f, 0.0954915f,0.820298f, 0.5f,1f,
1f,0.264767f, 0.75f,0f, 0.25f,0f, 0f,0.264767f};
int faces[][] = new int[][]{{52,0,10,1,23,2,22,3,8,4},
{50,0,38,1,39,2,51,3,29,4},
{59,0,27,1,15,2,11,3,1,4},
{19,0,41,1,47,2,54,3,17,4},
{18,0,16,1,53,2,46,3,40,4},
{0,0,9,1,14,2,26,3,58,4},
{35,0,25,1,43,2,49,3,37,4},
{3,0,57,1,21,2,31,3,7,4},
{33,0,28,1,32,2,44,3,45,4},
{20,0,56,1,2,2,5,3,30,4},
{36,0,48,1,42,2,24,3,34,4},
{12,0,4,1,55,2,6,3,13,4},
{8,1,58,5,26,6,50,7,29,8,52,2},
{52,1,29,5,51,6,27,7,59,8,10,2},
{10,1,59,5,1,6,41,7,19,8,23,2},
{23,1,19,5,17,6,16,7,18,8,22,2},
{22,1,18,5,40,6,0,7,58,8,8,2},
{12,1,24,5,42,6,2,7,56,8,4,2},
{4,1,56,5,20,6,32,7,28,8,55,2},
{55,1,28,5,33,6,21,7,57,8,6,2},
{6,1,57,5,3,6,43,7,25,8,13,2},
{13,1,25,5,35,6,34,7,24,8,12,2},
{39,1,37,5,49,6,15,7,27,8,51,2},
{15,1,49,5,43,6,3,7,7,8,11,2},
{11,1,7,5,31,6,47,7,41,8,1,2},
{47,1,31,5,21,6,33,7,45,8,54,2},
{54,1,45,5,44,6,53,7,16,8,17,2},
{53,1,44,5,32,6,20,7,30,8,46,2},
{46,1,30,5,5,6,9,7,0,8,40,2},
{9,1,5,5,2,6,42,7,48,8,14,2},
{14,1,48,5,36,6,38,7,50,8,26,2},
{38,1,36,5,34,6,35,7,37,8,39,2}};
int[] smooth = new int[] {
1, 2, 3, 4, 5, 6, 7, 8, 9, 10,
11, 12, 13, 14, 15, 16, 17, 18, 19, 20,
21, 22, 23, 24, 25, 26, 27, 28, 29, 30,
31, 32
};
PolygonMesh mesh = new PolygonMesh(points, texCoords, faces);
mesh.getFaceSmoothingGroups().addAll(smooth);
return mesh;
}
现在您可以轻松地将其添加到场景中:
private double mouseOldX, mouseOldY = 0;
private final Rotate rotateX = new Rotate(0, Rotate.X_AXIS);
private final Rotate rotateY = new Rotate(0, Rotate.Y_AXIS);
@Override
public void start(Stage primaryStage) {
PolygonMeshView meshView = new PolygonMeshView(getTruncatedIcosahedron());
final PhongMaterial phongMaterial = new PhongMaterial();
meshView.setDrawMode(DrawMode.LINE);
meshView.setMaterial(phongMaterial);
final Group group = new Group(meshView);
group.getTransforms().add(new Scale(50, 50, 50));
Scene scene = new Scene(group, 500, 300, true, SceneAntialiasing.BALANCED);
scene.setOnMousePressed(event -> {
mouseOldX = event.getSceneX();
mouseOldY = event.getSceneY();
});
scene.setOnMouseDragged(event -> {
rotateX.setAngle(rotateX.getAngle() - (event.getSceneY() - mouseOldY));
rotateY.setAngle(rotateY.getAngle() + (event.getSceneX() - mouseOldX));
mouseOldX = event.getSceneX();
mouseOldY = event.getSceneY();
});
PerspectiveCamera camera = new PerspectiveCamera(false);
camera.setNearClip(0.1);
camera.setFarClip(1000.0);
camera.getTransforms().addAll(rotateX, rotateY, new Translate(-250, -150, 0));
scene.setCamera(camera);
primaryStage.setTitle("JavaFX 3D - Truncated Icosahedron");
primaryStage.setScene(scene);
primaryStage.show();
}
将为您提供线框图:
如果你添加纹理的图像,你会得到你的足球:
phongMaterial.setDiffuseMap(new Image(getClass().getResourceAsStream("net3.png")));
meshView.setDrawMode(DrawMode.FILL);
现在,您可以根据自己的方便操作此信息,并将此网格修改为您正在寻找的网格。
https://stackoverflow.com/questions/52554535
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