No mesh data available for mesh Sphere001 on particle system fx_portal. Make sure Read/Write Enabled is set in the importer to work on the particle system renderer

这个错误通常是由于粒子系统中使用的网格（mesh）没有被正确导入所导致的。要解决这个问题，你需要确保以下几点：

1. 在导入网格时，确保已启用“读/写”选项。

2. 在粒子系统中使用的所有网格都已正确导入，并已链接到相关的粒子系统组件。

3. 如果你使用的是Unity 2018或更高版本，请确保在粒子系统组件上启用了“Enable GPU Instancing”选项。

4. 如果你使用的是旧版本的Unity，请尝试将粒子系统组件的“Render Mode”设置为“Mesh”。

如果你仍然无法解决问题，可以尝试在Unity的论坛或社区中寻求帮助。

相关问题

import FreeCAD import FreeCADGui from PySide import QtGui, QtCore Gui.activateWorkbench("PartWorkbench") FreeCAD.newDocument() class SphereDialog(QtGui.QDialog): def __init__(self): super().__init__() self.setWindowTitle("Create Sphere") self.create_widgets() def create_widgets(self): layout = QtGui.QVBoxLayout() # Radius widget radius_label = QtGui.QLabel("Radius:") self.radius_spinbox = QtGui.QDoubleSpinBox() self.radius_spinbox.setMinimum(0.1) self.radius_spinbox.setMaximum(1000.0) self.radius_spinbox.setValue(10.0) layout.addWidget(radius_label) layout.addWidget(self.radius_spinbox) # Opacity widget opacity_label = QtGui.QLabel("Opacity:") self.opacity_slider = QtGui.QSlider(QtCore.Qt.Horizontal) self.opacity_slider.setMinimum(0) self.opacity_slider.setMaximum(100) self.opacity_slider.setValue(50) layout.addWidget(opacity_label) layout.addWidget(self.opacity_slider) # Create button create_button = QtGui.QPushButton("Create") create_button.clicked.connect(self.create_sphere) layout.addWidget(create_button) self.setLayout(layout) def create_sphere(self): # Get sphere parameters radius = self.radius_spinbox.value() opacity = float(self.opacity_slider.value() / 100) # Create sphere sphere = FreeCAD.ActiveDocument.addObject("Part::Sphere", "Sphere") sphere.Radius = radius sphere.ViewObject.Transparency = int(round(opacity * 100)) # Show in 3D view sphere.ViewObject.Visibility = True FreeCADGui.SendMsgToActiveView("ViewFit") FreeCADGui.Selection.clearSelection() FreeCADGui.Selection.addSelection(sphere) FreeCADGui.SendMsgToActiveView("ViewFit") # Close dialog self.close() dialog = SphereDialog() dialog.show()代码中执行没有球体出现，请修改代码

根据您提供的代码，我发现在 `create_sphere` 函数中，创建球体后没有将其添加到文档中。修改代码如下：

import FreeCAD
import FreeCADGui
from PySide import QtGui, QtCore

Gui.activateWorkbench("PartWorkbench")
FreeCAD.newDocument()

class SphereDialog(QtGui.QDialog):
    def __init__(self):
        super().__init__()
        self.setWindowTitle("Create Sphere")
        self.create_widgets()

    def create_widgets(self):
        layout = QtGui.QVBoxLayout()

        # Radius widget
        radius_label = QtGui.QLabel("Radius:")
        self.radius_spinbox = QtGui.QDoubleSpinBox()
        self.radius_spinbox.setMinimum(0.1)
        self.radius_spinbox.setMaximum(1000.0)
        self.radius_spinbox.setValue(10.0)
        layout.addWidget(radius_label)
        layout.addWidget(self.radius_spinbox)

        # Opacity widget
        opacity_label = QtGui.QLabel("Opacity:")
        self.opacity_slider = QtGui.QSlider(QtCore.Qt.Horizontal)
        self.opacity_slider.setMinimum(0)
        self.opacity_slider.setMaximum(100)
        self.opacity_slider.setValue(50)
        layout.addWidget(opacity_label)
        layout.addWidget(self.opacity_slider)

        # Create button
        create_button = QtGui.QPushButton("Create")
        create_button.clicked.connect(self.create_sphere)
        layout.addWidget(create_button)

        self.setLayout(layout)

    def create_sphere(self):
        # Get sphere parameters
        radius = self.radius_spinbox.value()
        opacity = float(self.opacity_slider.value() / 100)

        # Create sphere
        sphere = FreeCAD.ActiveDocument.addObject("Part::Sphere", "Sphere")
        sphere.Radius = radius
        sphere.ViewObject.Transparency = int(round(opacity * 100))
        FreeCAD.ActiveDocument.recompute()  # 添加这行代码，重新计算文档

        # Show in 3D view
        sphere.ViewObject.Visibility = True
        FreeCADGui.SendMsgToActiveView("ViewFit")
        FreeCADGui.Selection.clearSelection()
        FreeCADGui.Selection.addSelection(sphere)
        FreeCADGui.SendMsgToActiveView("ViewFit")

        # Close dialog
        self.close()

dialog = SphereDialog()
dialog.show()

在 `create_sphere` 函数中，我添加了 `FreeCAD.ActiveDocument.recompute()`，这会重新计算文档，使得添加的球体能够在 3D 视图中显示。

complete abstract class GraphicObject and implement subclasses Cone , Cuboid and Sphere based on the class GraphicObject .

Here is an example implementation of the abstract class GraphicObject and its subclasses Cone, Cuboid, and Sphere:

abstract class GraphicObject {
    protected int x, y;

    public GraphicObject(int x, int y) {
        this.x = x;
        this.y = y;
    }

    abstract double area();
    abstract double perimeter();
}

class Cone extends GraphicObject {
    private int radius;
    private int height;

    public Cone(int x, int y, int radius, int height) {
        super(x, y);
        this.radius = radius;
        this.height = height;
    }

    @Override
    double area() {
        return Math.PI * radius * (radius + Math.sqrt(Math.pow(height, 2) + Math.pow(radius, 2)));
    }

    @Override
    double perimeter() {
        return 2 * Math.PI * radius;
    }
}

class Cuboid extends GraphicObject {
    private int length;
    private int width;
    private int height;

    public Cuboid(int x, int y, int length, int width, int height) {
        super(x, y);
        this.length = length;
        this.width = width;
        this.height = height;
    }

    @Override
    double area() {
        return 2 * (length * width + width * height + height * length);
    }

    @Override
    double perimeter() {
        return 4 * (length + width + height);
    }
}

class Sphere extends GraphicObject {
    private int radius;

    public Sphere(int x, int y, int radius) {
        super(x, y);
        this.radius = radius;
    }

    @Override
    double area() {
        return 4 * Math.PI * Math.pow(radius, 2);
    }

    @Override
    double perimeter() {
        return 2 * Math.PI * radius;
    }
}

The abstract class `GraphicObject` defines the common properties and methods that all subclasses must implement. The `Cone`, `Cuboid`, and `Sphere` classes extend the `GraphicObject` class and provide their own implementations of the `area()` and `perimeter()` methods.

For example, the `Cone` class calculates the surface area and circumference of a cone based on its radius and height, while the `Cuboid` class calculates the surface area and perimeter of a rectangular cuboid based on its length, width, and height. The `Sphere` class calculates the surface area and circumference of a sphere based on its radius.

Note that the `GraphicObject` class is abstract and cannot be instantiated directly. Instead, it provides a template for creating subclasses that represent specific types of geometric objects.