blender 命令行渲染

Posted 2021-11-09 长虹剑

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文章目录

基础环境配置
初步尝试杂记
- 渲染
自己的一些代码
- 基本渲染设置
- 骨骼驱动的一些心得

基础环境配置

安装及资料

apt-get install blender

虚拟桌面 Xvfb

在服务器上想要运行blender需要建立虚拟桌面，挺简单的就

apt-get install Xvfb

使用的时候，首先开启虚拟桌面到后台，然后就可以运行 blender 了

export DISPLAY=:6
Xvfb -ac :6 -screen 0 640x480x24 & # 1920x1080x24
blender -b --render-output tmp/res -f 0

blender 内置 python 修改 packages

找了半天至今不知道 blender 到底是调用的哪里的 python ，不过我猜测它可能把 python 给直接编译进去了，所以后期我们应该是换不了这个python的。所以就直接 sys 中替换加载变量的路径就行。

具体就是先运行

blender -b -P ck_bpy.py

ck_bpy.py 就写一个 print(sys.path)
获得路径，然后自己的 python 也打印一下，把路径拿出来，插入到指定位置就行。

编译 blender

svn 太慢，wget 下载的方法如下

wget -P download -r -p -np https://svn.blender.org/svnroot/bf-blender/trunk/lib/linux_centos7_x86_64 -o res.log

初步尝试杂记

渲染

用默认的blend，调用脚本渲染

blender -b -P tmp/test.py -o tmp/res -f 0

import bpy
for e in bpy.data.objects:
    print(e.name)
bpy.ops.render.render()
bpy.data.images['Render Result'].save_render(filepath='tmp/res/example.png')

直接命令行指定渲染

blender -b --render-output tmp/res -f 0

自己的一些代码

（未整理）

基本渲染设置

def f2_render_bones_video():
    FPS = 15 # 60
    smpl2skeleton = Cls_smpl2skeleton( fsmpl2rig, fparents, frot_mp )
    pms = smpl2skeleton.example( fpm )
    params.pms = pms
    params.parents = smpl2skeleton.parents
    params.NJ = smpl2skeleton.NJ

    ob = bpy.data.objects["smpl_skeleton"]
    bpy.app.handlers.frame_change_pre.clear()
    bpy.app.handlers.frame_change_pre.append(frame_change_pre)
    bpy.context.view_layer.objects.active = ob #相当于鼠标左键选中
    bpy.ops.object.mode_set(mode='POSE') #切换为pose更改模式
    arr = []
    bones = []
    for i in range(24):
        bone=ob.pose.bones[f'Bone{i}']
        bone.rotation_mode = 'AXIS_ANGLE' #'XYZ'
        bones.append( bone )
        if i==0:
            arr.append( bone.location.copy() )
        arr.append( bone.rotation_axis_angle )  # tuple arr
    #print( [ e[:] for e in arr ] )
    params.T_pose = arr
    params.bones = bones
    set_render_engine()
    if isdbg:
        #set_scene( 30  )
        set_scene( 3  )
    else:
        set_scene( len(params.pms)  )
    set_render_for_video( fv, fps=FPS )

    bpy.ops.wm.save_mainfile( filepath = fblend )

def frame_change_pre(scene):
    rcnt = scene.frame_current
    NJ = params.NJ
    bones = params.bones
    bones[0].location = params.T_pose[ 0 ].copy()
    for i in range(params.NJ):
        #if i==0:
        #    print(111, params.T_pose[ i+1 ][:], bones[i].rotation_axis_angle[:])
        bones[i].rotation_axis_angle = params.T_pose[ i+1 ]

    pm = params.pms[rcnt]
    for i in range(NJ-1, -1, -1):
        a = 3+i*4
        #if i==0:
        #    print( pm[a:a+4], bones[i].rotation_axis_angle[:] )
        bones[i].rotation_axis_angle = tuple(pm[a:a+4].tolist())
    bones[0].location = pm[:3]


def set_render_engine():
    for scene in bpy.data.scenes:
        scene.render.engine = 'BLENDER_EEVEE'

    scene = bpy.context.scene
    eevee = scene.eevee

    eevee.use_soft_shadows = True

    eevee.use_ssr = True
    eevee.use_ssr_refraction = True

    eevee.use_gtao = True
    eevee.gtao_distance = 1

    eevee.use_volumetric_shadows = True
    eevee.volumetric_tile_size = '2'

def set_scene( full_frame ):
    bpy.context.scene.frame_end = full_frame
    #bpy.context.scene.camera = bpy.data.objects['camera']

def set_render_for_video(fv, fps=30, w=640, h=360 ):
    r = bpy.context.scene.render
    r.filepath = fv
    #scene.render.image_settings.file_format = 'PNG' # set output format to .png
    r.image_settings.file_format = 'FFMPEG' # set output format to .png
    r.ffmpeg.format = 'MPEG4'
    r.fps = fps
    r.resolution_x = w
    r.resolution_y = h

    bpy.ops.render.render(animation=True)

    #r.image_settings.file_format = 'PNG'
    #r.color_mode = 'RGBA'
    #bpy.types.FFmpegSettings.codec = "PNG"
    #bpy.types.FFmpegSettings.pix_fmt = "RGBA"

def set_render_for_picture(fimg, w=640, h=360 ):
    r = bpy.context.scene.render
    r.filepath = fimg
    r.image_settings.file_format = 'PNG'
    r.resolution_x = w
    r.resolution_y = h
    bpy.ops.render.render(write_still=True)