如何将颜色应用于从Blender 2.69导入到VTK 6.2 + Qt 5.3的网格

Question

我是vtk和Qt的新手，我在blender中创建了一个3面红色和1面绿色的立方体，并导出为立方体。保存颜色信息:

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小部件，我的代码绘制了灰色的立方体。下面是我的mainwindow.cpp文件(经过各种修改以显示颜色):

#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的例子，我没有找到一个显示如何从导入的3d文件映射颜色。我肯定我漏了一段代码。

附带问题，多维数据集加载在QVTKWidget中看起来不对称。我想知道这是否是QVTK的问题。我正在附加一个图像…

访问http://postimg.org/image/r8093cwbt/获取图片

Answer 1

您可以尝试访问vtkPolyData，然后pointData(或cellData)和设置颜色，就像这样

mapper->GetInput()->GetPointData()->SetScalars(colors);

在这个例子中，color是一个vtkUnsignedCharArray，颜色为r,g,b(更多细节在这里)。

或者你也可以试着修改演员的属性，像这样:

actor->GetProperty()SetColor(double r, double g, double b);

在这种情况下，请记住添加#include <vtkProperty.h>行，以便能够访问actor的属性