为了让数值计算的结果能够有更好的渲染效果，这段时间一直在用Blender这个开源软件来处理计算结果。

因为是处理大量数据的计算结果，所以不得不考虑用Python编写脚本来实现批量处理，编写过程中，Google帮我解决了大部分实现过程中的障碍，下面是完整的实现过程：

  1. 将计算结果的mesh文件导入到Blender中；

    import bpy 
import os 

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

# folder path for importing data files
in_dir_ply = \"E:\\\\SPH\\\\Paper 01\\\\D18\\\\Ply_batch\\\\\"
lst_ply = os.listdir(in_dir_ply)

# folder path to save rendered animation
out_dir = \"E:\\\\SPH\\\\Paper 01\\\\D18\\\\test.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

  2. 在Blender中进行批量渲染并保存成图片文件；（这里用到了提前制作好的材质文件“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 = \'//%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

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

    # 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)

  4. 在Blender中生成并保存动画文件。

    # 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 )