Question

我正在尝试使用Blender的python API将图像缓冲区另存为.png（但这主要只是一个python问题）我正在尝试通过创建一个线程来保存图像来加快速度，并且创建线程的函数是从刷新3D屏幕时激活的回调处理程序中调用的，以下是完整代码（有点混乱）：

import base64, io, os, bgl, gpu, bpy, threading, time, sys
import numpy as np
from gpu_extras.presets import draw_texture_2d
from PIL import Image
import multiprocessing.pool as mpool

finalPath = bpy.context.scene.render.filepath + "hithere.png"


WIDTH = 1920
HEIGHT = 1080



offscreen = gpu.types.GPUOffScreen(WIDTH, HEIGHT)

def draw2():
    global finalPath
    global array
    global WIDTH
    global HEIGHT
    global needsSaving
    context = bpy.context
    scene = context.scene

    view_matrix = scene.camera.matrix_world.inverted()

    projection_matrix = scene.camera.calc_matrix_camera(
        context.depsgraph, x=WIDTH, y=HEIGHT)

    offscreen.draw_view3d(
        scene,
        context.view_layer,
        context.space_data,
        context.region,
        view_matrix,
        projection_matrix)

    bgl.glDisable(bgl.GL_DEPTH_TEST)
    draw_texture_2d(offscreen.color_texture, (0, -125), WIDTH, HEIGHT)

    buffer = bgl.Buffer(bgl.GL_BYTE, WIDTH * HEIGHT * 4)
    bgl.glReadBuffer(bgl.GL_BACK)
    bgl.glReadPixels(0, -125, WIDTH, HEIGHT, bgl.GL_RGBA, bgl.GL_UNSIGNED_BYTE, buffer)


    needle = threading.Thread(target=saveIt,args=[buffer, finalPath, WIDTH, HEIGHT])
    needle.daemon = True
    needle.start()
  ####  thread.start_new_thread(saveIt,(buffer, finalPath, WIDTH, HEIGHT))



def coby(scene):
    frame = scene.frame_current
    folder = scene.render.filepath
    myFormat = "png"#scene.render.image_settings.renderformat.lower()
    outputPath = os.path.join(folder, "%05d.%s" % (frame, myFormat))
    global finalPath
    finalPath = outputPath



h = bpy.types.SpaceView3D.draw_handler_add(draw2, (), 'WINDOW', 'POST_PIXEL')
bpy.app.handlers.frame_change_pre.clear()
bpy.app.handlers.frame_change_pre.append(coby)


def saveIt(buffer, path, width, height):
    array = np.asarray(buffer, dtype=np.uint8)
    myBytes = array.tobytes()
    im = Image.frombytes("RGBA",(width, height), myBytes)
    rawBytes = io.BytesIO()
    im.save(rawBytes, "PNG")
    rawBytes.seek(0)
    base64Encoded = base64.b64encode(rawBytes.read())
    txt =  "data:image/png;base64," + base64Encoded.decode()
    f = open(finalPath, "wb")
    f.write(base64.decodebytes(base64Encoded))
    f.close()

它确实起作用，除了当我在Blender中播放时间线（它调用frame_pre回调以及3D视图刷新回调（尽管不确定顺序））时，我的大多数图像都被替换了，除了一些没有，如以下屏幕截图所示： [！[在此处输入图片描述] [1]] [1]

我最初拥有所有蓝图图像，然后我在线程中运行脚本，并替换了几乎所有蓝图图像，除了一些蓝图图像仍然保留（似乎以随机间隔）。如果我在创建线程后立即调用.join（）或根本不使用该线程，则此方法很好用，但是看来线程是使其运行更快的唯一方法。

我一直在寻找如何将线程与队列和池一起使用（How to use python multiprocessing Pool.map within loop，What happened to thread.start_new_thread in python 3， How can I make a background, non-blocking input loop in python?，Creating Threads in python）

SO：为什么不是所有线程都完成了？ [1]：https://i.stack.imgur.com/nJCwH.png .................

python线程在回调中创建，未完成

0 个答案: