VTK编程

VTK草稿3

2015-09-23  本文已影响0人  yzld2002

Chapter4 The Basics

4.1 Creatng Simple Models

Procedural Source Object

#include "vtkCylinderSource.h"
vtkCylinderSource *cylinder = vtkCylinderSource::New();
cylinder->SetResolution(8);  // 即8个面
Cylinder

Reader Source Object

/*=========================================================================

  Program:   Visualization Toolkit
  Module:    CADPart.cxx

=========================================================================*/
//
//

// First include the required header files for the VTK classes we are using.
#include "vtkSTLReader.h"
#include "vtkLODActor.h"

#include "vtkPolyDataMapper.h"
#include "vtkProperty.h"
#include "vtkRenderWindow.h"
#include "vtkCamera.h"
#include "vtkActor.h"
#include "vtkRenderer.h"
#include "vtkRenderWindowInteractor.h"

int main()
{
    vtkSTLReader *part = vtkSTLReader::New();
    part->SetFileName("/Volumes/Data/VTK/VTK-6.2.0/.ExternalData/MD5/31c7bb73f4b6c19c53f98c6d8fa4b686");

    vtkPolyDataMapper *partMapper = vtkPolyDataMapper::New();
    partMapper->SetInputConnection(part->GetOutputPort());

    vtkLODActor *partActor = vtkLODActor::New();
    partActor->SetMapper(partMapper);
    partActor->GetProperty()->SetColor(1.0000, 0.2311, 0.1111);
    partActor->RotateX(30.0);
    partActor->RotateY(-45.0);

    vtkRenderer *ren1 = vtkRenderer::New();
    vtkRenderWindow *renWin = vtkRenderWindow::New();
    renWin->AddRenderer(ren1);
    vtkRenderWindowInteractor *iren = vtkRenderWindowInteractor::New();
    iren->SetRenderWindow(renWin);

    ren1->AddActor(partActor);
    ren1->SetBackground(0.1, 0.2, 0.4);
    renWin->SetSize(800, 800);

    ren1->ResetCamera();
    ren1->GetActiveCamera()->Zoom(1.5);

    iren->Initialize();
    renWin->Render();
    iren->Start();

    part->Delete();
    partMapper->Delete();
    partActor->Delete();
    ren1->Delete();
    renWin->Delete();
    iren->Delete();

    return 0;
}

LOD的意思是Level of Detail,用这个而不用vtkActor的原因是当图形很复杂时,转动图形或放大缩小会导致帧率下降,而vtkLODActor的作用就是在这些变换图形的过程中降低渲染的质量,可能只会显示由顶点和连线构成的框架。

VTK_DATA_ROOT = vtkGetDataRoot()
part.SetFileName(VTK_DATA_ROOT + "/Data/42400-IDGH.stl")

这两句执行,但是c++好像没有对应的脚本可以调用。通过搜索这个stl文件,发现只有一个"42400-IDGH.stl.md5"文件,打开是个md5值,联想到之前安装VTK的时候由VTKData.zip解压出很多md5码作为文件名的文件,用其中和stl对应的文件作为数据来源,得到了期望的结果。

cmake_minimum_required(VERSION 2.8.5 FATAL_ERROR)
if(POLICY CMP0025)
  cmake_policy(SET CMP0025 NEW) # CMake 3.0
endif()
if(POLICY CMP0053)
  cmake_policy(SET CMP0053 NEW) # CMake 3.1
endif()

project (CADPart)

find_package(VTK COMPONENTS
  vtkFiltersSources
  vtkInteractionStyle
  vtkRenderingOpenGL
  vtkRenderingLOD
  vtkIOGeometry
)
include(${VTK_USE_FILE})

add_executable(CADPart MACOSX_BUNDLE CADPart.cxx)
target_link_libraries(CADPart ${VTK_LIBRARIES})

find_package中添加了vtkRenderingLODvtkIOGeometry,这就是那两个头文件所对应的二进制执行代码模块。找到这两个模块费了点时间,需要在编译VTK源码的时候生成的一堆module中寻找,目前我还没有找到快捷的搜索module方式 (TODO).

换个角度。。。

嗯……就是这么个奇怪的东西……

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