Blender下用Python實現(xiàn)模型文件導入、渲染和動畫生成

villainhr 發(fā)布于2019-07-25 10:24 / 3516人閱讀

摘要：為了讓數(shù)值計算的結(jié)果能夠有更好的渲染效果，這段時間一直在用這個開源軟件來處理計算結(jié)果。

為了讓數(shù)值計算的結(jié)果能夠有更好的渲染效果，這段時間一直在用Blender這個開源軟件來處理計算結(jié)果。

因為是處理大量數(shù)據(jù)的計算結(jié)果，所以不得不考慮用Python編寫腳本來實現(xiàn)批量處理，編寫過程中，Google幫我解決了大部分實現(xiàn)過程中的障礙，下面是完整的實現(xiàn)過程：

將計算結(jié)果的mesh文件導入到Blender中；

import bpy 
import os 

# folder path to save rendered image
in_dir = "E:SPHPaper 01D18"
lst = os.listdir(in_dir)

# folder path for importing data files
in_dir_ply = "E:SPHPaper 01D18Ply_batch"
lst_ply = os.listdir(in_dir_ply)

# folder path to save rendered animation
out_dir = "E:SPHPaper 01D18	est.avi"

# Filter file list by valid file types.
candidates = []
candidates_name = []
c = 0
for item in lst_ply:
    fileName, fileExtension = os.path.splitext(lst_ply[c])
    if fileExtension == ".ply":
        candidates.append(item)
        candidates_name.append(fileName)
    c = c + 1

file = [{"name":i} for i in candidates]   
n = len(file)
print(n) 

# To import mesh.ply in batches
for i in range (0,n):
    bpy.ops.import_mesh.ply(filepath=candidates[n], files=[file[n]], directory=in_dir_ply, filter_glob="*.ply")
    bpy.data.objects[candidates_name[i]].hide = True
    bpy.data.objects[candidates_name[i]].hide_render = True

在Blender中進行批量渲染并保存成圖片文件；（這里用到了提前制作好的材質(zhì)文件“Material.001”）

# Set file_format for render images
bpy.data.scenes["Scene"].render.image_settings.file_format = "PNG"

# To render and save rendered images
for i in range (0,n):
    bpy.data.objects[candidates_name[i]].hide = False    #objects must be visible to use modifier
    bpy.data.objects[candidates_name[i]].hide_render = False    #objects must be renderable to export render image
    bpy.context.scene.objects.active = bpy.data.objects[candidates_name[i]] #get object
    bpy.ops.object.modifier_add(type="PARTICLE_SYSTEM")    #add modifier as particle_system
    bpy.data.objects[candidates_name[i]].particle_systems["ParticleSystem"].settings = bpy.data.particles["ParticleSettings"] #assign particle settings to object"s particle system
    bpy.data.objects[candidates_name[i]].data.materials.append(bpy.data.materials["Material.001"])    #assign existed material to active object.
    bpy.data.scenes["Scene"].render.filepath = "http://%02d"%(i)    #set save filepath
    bpy.ops.render.render( write_still=True )    #render and save
    bpy.data.objects[candidates_name[i]].hide = True    #hide again for next image rendering
    bpy.data.objects[candidates_name[i]].hide_render = True    #hide again for next image rendering

在Blender的Video Sequence Editor (VSE)中插入上一步生成的渲染后的圖片文件；

# Active VSE to generate rendering animation
bpy.data.scenes["Scene"].render.use_sequencer = True

# Filter file list by valid file types.
re_image = []
re_image_name = []
c = 0
for item in lst:
    fileName, fileExtension = os.path.splitext(lst[c])
    if fileExtension == ".png":
        re_image.append(item)
        re_image_name.append(fileName)
    c = c + 1

# Create the sequencer data
bpy.context.scene.sequence_editor_create()

# Add strip into VSE by importing new image
for i in range (0,n):
    bpy.context.scene.sequence_editor.sequences.new_image(
        name=re_image[i],
        filepath=os.path.join(in_dir, re_image[i]),
        channel=1, frame_start=i)

在Blender中生成并保存動畫文件。

# Resolution settings for animation
resx = 720; #1920 
resy = 480; #1080 
bpy.data.scenes["Scene"].render.resolution_x = resx 
bpy.data.scenes["Scene"].render.resolution_y = resy 
bpy.data.scenes["Scene"].render.resolution_percentage = 100 

bpy.data.scenes["Scene"].frame_end = n 
bpy.data.scenes["Scene"].render.image_settings.file_format = "AVI_JPEG" 
bpy.data.scenes["Scene"].render.filepath = out_dir
bpy.ops.render.render( animation=True )