我是vtk和Qt的新手。我在搅拌机中创建了一个立方体,其中3个面为红色,1个面为绿色,并导出为cube.ply以保留颜色信息:
ply
format ascii 1.0
comment Created by Blender 2.69 (sub 0) - www.blender.org, source file: ''
element vertex 24
property float x
property float y
property float z
property float nx
property float ny
property float nz
element face 6
property list uchar uint vertex_indices
end_header
1.000000 1.000000 -1.000000 0.000000 0.000000 -1.000000
1.000000 -1.000000 -1.000000 0.000000 0.000000 -1.000000
-1.000000 -1.000000 -1.000000 0.000000 0.000000 -1.000000
-1.000000 1.000000 -1.000000 0.000000 0.000000 -1.000000
1.000000 0.999999 1.000000 0.000000 -0.000000 1.000000
-1.000000 1.000000 1.000000 0.000000 -0.000000 1.000000
-1.000000 -1.000000 1.000000 0.000000 -0.000000 1.000000
0.999999 -1.000001 1.000000 0.000000 -0.000000 1.000000
1.000000 1.000000 -1.000000 1.000000 -0.000000 0.000000
1.000000 0.999999 1.000000 1.000000 -0.000000 0.000000
0.999999 -1.000001 1.000000 1.000000 -0.000000 0.000000
1.000000 -1.000000 -1.000000 1.000000 -0.000000 0.000000
1.000000 -1.000000 -1.000000 -0.000000 -1.000000 -0.000000
0.999999 -1.000001 1.000000 -0.000000 -1.000000 -0.000000
-1.000000 -1.000000 1.000000 -0.000000 -1.000000 -0.000000
-1.000000 -1.000000 -1.000000 -0.000000 -1.000000 -0.000000
-1.000000 -1.000000 -1.000000 -1.000000 0.000000 -0.000000
-1.000000 -1.000000 1.000000 -1.000000 0.000000 -0.000000
-1.000000 1.000000 1.000000 -1.000000 0.000000 -0.000000
-1.000000 1.000000 -1.000000 -1.000000 0.000000 -0.000000
1.000000 0.999999 1.000000 0.000000 1.000000 0.000000
1.000000 1.000000 -1.000000 0.000000 1.000000 0.000000
-1.000000 1.000000 -1.000000 0.000000 1.000000 0.000000
-1.000000 1.000000 1.000000 0.000000 1.000000 0.000000
4 0 1 2 3
4 4 5 6 7
4 8 9 10 11
4 12 13 14 15
4 16 17 18 19
4 20 21 22 23
我在Qt Creator中创建了一个QVTK Widget,我的代码用灰色绘制了多维数据集。以下是我的mainwindow.cpp文件(经过各种修改以获得颜色显示):
#include "mainwindow.h"
#include "ui_mainwindow.h"
#include "QVTKInteractor.h"
#include <vtkSTLReader.h>
#include <vtkPLYReader.h>
#include <vtkSmartPointer.h>
#include <vtkPolyDataMapper.h>
#include <vtkActor.h>
#include <vtkRenderWindow.h>
#include <vtkRenderer.h>
#include <vtkRenderWindowInteractor.h>
#include <vtkProperty.h>
MainWindow::MainWindow(QWidget *parent) :
QMainWindow(parent),
ui(new Ui::MainWindow)
{
ui->setupUi(this);
vtkSmartPointer<vtkPolyDataMapper> mapper = vtkSmartPointer<vtkPolyDataMapper>::New();
vtkSmartPointer<vtkRenderer> renderer = vtkSmartPointer<vtkRenderer>::New();
vtkSmartPointer<vtkRenderWindow> renwin = vtkSmartPointer<vtkRenderWindow>::New();
vtkSmartPointer<QVTKInteractor> interactor= vtkSmartPointer<QVTKInteractor>::New();
vtkSmartPointer<vtkPLYReader> reader = vtkSmartPointer<vtkPLYReader>::New();
vtkSmartPointer<vtkActor> actor = vtkSmartPointer<vtkActor>::New();
reader->SetFileName("../vtk2/media/cube.ply");
reader->Update();
mapper->SetColorModeToMapScalars();
mapper->SetInputConnection(reader->GetOutputPort());
mapper->ScalarVisibilityOn();
actor->SetMapper(mapper);
renderer->AddActor(actor);
ui->qvtkWidget->SetRenderWindow(renwin);
ui->qvtkWidget->GetRenderWindow()->AddRenderer(renderer);
renderer->SetBackground(.3,.6,.3);
actor->GetProperty()->SetFrontfaceCulling(true);
QVTKInteractor* inter=ui->qvtkWidget->GetInteractor();
}
MainWindow::~MainWindow()
{
delete ui;
}
它不显示任何颜色。尝试了各种VTK示例后,我还没有找到一个展示如何从导入的3d文件中映射颜色的示例。我确信我错过了一段代码。
副作用,立方体在QVTKWidget中加载看起来不对称。我想知道这是否与QVTK有关。我正在附上一张图片..
答案 0 :(得分:0)
您可以尝试访问vtkPolyData,然后访问pointData(或cellData)并设置颜色,如下所示
mapper->GetInput()->GetPointData()->SetScalars(colors);
在这种情况下,color是一个vtkUnsignedCharArray,颜色为r,g,b(更多细节Here)。
或者您也可以尝试修改这样的actor属性:
actor->GetProperty()SetColor(double r, double g, double b);
在这种情况下,请记住添加行#include <vtkProperty.h>
以便能够访问actor的属性