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VTK commonly used controls and how to achieve cone drawing, many novices are not very clear about this, in order to help you solve this problem, the following editor will explain in detail for you, people with this need can come to learn, I hope you can get something.

The following components are commonly used when drawing objects with VTK. In order to deepen understanding, VTK likens the rendering process of an object to a performance (really vivid):

VtkRenderWindow: a drawing window, equivalent to a stage venue for a performance

VtkRenderer-involves the drawing process of lights, cameras, actor; equivalent to the overall performance on the stage

VtkLight-the light source is used to illuminate the scene

VtkCamera-defines the viewing angle, focal length, and visual properties of the scene, equivalent to the visual field of the audience

VtkActor-objects rendered in the scene, attributes and their position in the scene, props displayed in the drawing; actors and props equivalent to the performance

VtkProperty modifies the properties of vtkActor, including color, transparency and light properties (reflection and refraction), and the light used for the performance

VtkMapper-vtkActor geometric mapping, when drawing, you need to convert vtkAcor to geometric attributes before you can draw; multiple vtkActor can set the same mapper.

The following figure is the annotation of each component in the drawing effect of VTK:

When drawing an object, you need to provide the source data, perform a series of operations on the data (reading, format conversion, Filter image processing), and then convert it to vtkMapper. After setting the `vtkMapper by vtkActor, it is passed into the vtkRendener (painter).

When implementing the code, if vtkLight and vtkCamera are not defined, the program will automatically create these two components.

Overall, the data pipeline flow of VTK is as follows:

Here is the use of code to achieve a cone drawing, with the help of a class vtkConeSource.h provided by VTK

# include

# include

# include

# include

# include

# include

# include

# include

# include "vtkAutoInit.h"

VTK_MODULE_INIT (vtkRenderingOpenGL2); / / VTK was built with vtkRenderingOpenGL2

VTK_MODULE_INIT (vtkInteractionStyle)

Int main ()

{

VtkSmartPointer Cone = vtkSmartPointer::New ()

VtkSmartPointer colors = vtkSmartPointer::New ()

Cone- > SetHeight (3.0); / / Cone Height

Cone- > SetRadius (1.0); / / Cone Radius

Cone- > SetResolution (9); / / Cone faces

VtkSmartPointer coneMapper = vtkSmartPointer::New ()

ConeMapper- > SetInputConnection (Cone- > GetOutputPort ()); / / Mapper data

VtkSmartPointer coneActor = vtkSmartPointer::New ()

ConeActor- > SetMapper (coneMapper)

VtkSmartPointer coneRender = vtkSmartPointer::New ()

ConeRender- > AddActor (coneActor)

ConeRender- > SetBackground (colors- > GetColor3d ("MidnightBlue"). GetData (); / / Bachground color

VtkSmartPointer renWindow = vtkSmartPointer::New ()

RenWindow- > AddRenderer (coneRender)

RenWindow- > SetSize (300,300); / / Size of Window

For (auto I = 0; I

Render ()

/ / rotate the active camera by one degree

ConeRender- > GetActiveCamera ()-> Azimuth (1)

}

Getchar ()

Return EXIT_SUCCESS

}

The final effect is as follows:

Several parameters are set for the cone in the code: height, bottom radius, and the number of included faces (the total number of faces involved in the cone)

VTK in addition to the header file vtkConeSource.h provides conical data, there are ellipses, cubes, rings and other data objects.

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