Vtk，（visualization toolkit）是一個開源的免費軟件系統，主要用於三維計算機圖形學、圖像處理和可視化。Vtk是在面向對象原理的基礎上設計和實現的，它的內核是用C++構建的，包含有大約250,000行代碼，2000多個類，還包含有幾個轉換界面，因此也可以自由的通過Java，Tcl/Tk和Python各種語言使用vtk。以下介紹VTK對於STL圖像的基本操作

STL圖像加載、縮放、旋轉

import os

import vtk


base_file = "E:\\study\\company\\model"
test_file = "dongmai.stl"
actor = vtk.vtkActor()


def show(file_name):
    # load stl file
    reader = vtk.vtkSTLReader()
    reader.SetFileName(file_name)

    mapper = vtk.vtkPolyDataMapper()
    mapper.SetInputConnection(reader.GetOutputPort())

    actor.SetMapper(mapper)
    # actor.RotateY(45)

    # Create a rendering window and renderer
    ren = vtk.vtkRenderer()
    renWin = vtk.vtkRenderWindow()
    renWin.AddRenderer(ren)

    # Create a renderwindowinteractor
    iren = vtk.vtkRenderWindowInteractor()
    iren.SetRenderWindow(renWin)

    # Assign actor to the renderer
    ren.AddActor(actor)

    # Enable user interface interactor
    iren.Initialize()
    renWin.Render()
    iren.Start()
    return iren


# 繞x軸旋轉
def rotate_x(num):
    actor.RotateX(num)


def rotate_y(num):
    actor.RotateY(num)


def rotate_z(num):
    actor.RotateZ(num)


# 設置方向
def set_origin(x, y, z):
    actor.SetOrientation(x, y, z)


def get_origin():
    return actor.GetOrientation()


# 縮放
def set_scale(x, y, z):
    actor.SetScale(x, y, z)


def main():
    show(os.path.join(base_file, test_file))


if __name__ == ‘__main__‘:
    main()
 

顯示結果

鼠標事件監聽

# 監聽事件
class MyEvent(vtk.vtkInteractorStyleTrackballCamera):

    def __init__(self, parent=None):
        # 鼠標中鍵
        self.AddObserver("MiddleButtonPressEvent", self.middle_button_press_event)
        self.AddObserver("MiddleButtonReleaseEvent", self.middle_button_release_event)
        # 鼠標左鍵
        self.AddObserver("LeftButtonPressEvent", self.left_button_press_event)
        self.AddObserver("LeftButtonReleaseEvent", self.left_button_release_event)
        # 鼠標右鍵
        self.AddObserver("RightButtonPressEvent", self.right_button_press_event)
        self.AddObserver("RightButtonReleaseEvent", self.right_button_release_event)

    def middle_button_press_event(self, obj, event):
        print("Middle Button pressed")
        self.OnMiddleButtonDown()
        return

    def middle_button_release_event(self, obj, event):
        print("Middle Button released")
        self.OnMiddleButtonUp()
        return

    def left_button_press_event(self, obj, event):
        print("Left Button pressed")
        self.OnLeftButtonDown()
        return

    def left_button_release_event(self, obj, event):
        print("Left Button released")
        self.OnLeftButtonUp()
        return

    def right_button_press_event(self, obj, event):
        print("right Button pressed")
        self.OnRightButtonDown()
        return

    def right_button_release_event(self, obj, event):
        print("right Button released")
        self.OnLeftButtonUp()
        return

# 引入上一段代碼調用
iren.SetInteractorStyle(MyEvent())
 

結果

參考文檔

Python VTK Example
VTK筆記——模型的空間變換(Transform).平移、旋轉和縮放

Python vtk學習(1)