[游戏开发]python vtk 图片保存和相机设置。

Python VTK中文资料好少啊，有个任务要调整摄像机位置并且保存图片，中文帖子没几个这方面的，啃官方文档解决啦，粗略记录一下。
调整相机：

render = vtk.vtkRenderer()
render.AddActor(actor)
render.SetBackground(0, 0, 0)
camera = render.GetActiveCamera()
#设置视角
camera.SetPosition(0, 60, 500)
camera.SetFocalPoint(0, 100, 0)
#设置物体
camera.Azimuth(60)
camera.Elevation(-300)
camera.Dolly(1.5)
camera.Roll(11)
camera.Pitch(11)
camera.Zoom(10)

保存图片：

from pathlib import Path

from vtkmodules.vtkIOImage import (
    vtkBMPWriter,
    vtkJPEGWriter,
    vtkPNGWriter,
    vtkPNMWriter,
    vtkPostScriptWriter,
    vtkTIFFWriter
)
from vtkmodules.vtkRenderingCore import vtkWindowToImageFilter


def write_image(file_name, ren_win, rgba=True):
    """
    Write the render window view to an image file.

    Image types supported are:
     BMP, JPEG, PNM, PNG, PostScript, TIFF.
    The default parameters are used for all writers, change as needed.

    :param file_name: The file name, if no extension then PNG is assumed.
    :param ren_win: The render window.
    :param rgba: Used to set the buffer type.
    :return:
    """

    if file_name:
        valid_suffixes = ['.bmp', '.jpg', '.png', '.pnm', '.ps', '.tiff']
        # Select the writer to use.
        parent = Path(file_name).resolve().parent
        path = Path(parent) / file_name
        if path.suffix:
            ext = path.suffix.lower()
        else:
            ext = '.png'
            path = Path(str(path)).with_suffix(ext)
        if path.suffix not in valid_suffixes:
            print(f'No writer for this file suffix: {ext}')
            return
        if ext == '.bmp':
            writer = vtkBMPWriter()
        elif ext == '.jpg':
            writer = vtkJPEGWriter()
        elif ext == '.pnm':
            writer = vtkPNMWriter()
        elif ext == '.ps':
            if rgba:
                rgba = False
            writer = vtkPostScriptWriter()
        elif ext == '.tiff':
            writer = vtkTIFFWriter()
        else:
            writer = vtkPNGWriter()

        windowto_image_filter = vtkWindowToImageFilter()
        windowto_image_filter.SetInput(ren_win)
        windowto_image_filter.SetScale(1)  # image quality
        if rgba:
            windowto_image_filter.SetInputBufferTypeToRGBA()
        else:
            windowto_image_filter.SetInputBufferTypeToRGB()
            # Read from the front buffer.
            windowto_image_filter.ReadFrontBufferOff()
            windowto_image_filter.Update()

        writer.SetFileName(path)
        writer.SetInputConnection(windowto_image_filter.GetOutputPort())
        writer.Write()
    else:
        raise RuntimeError('Need a filename.')

详细看官方文档
官方文档链接：https://kitware.github.io/vtk-examples/site/