blender_batch_render.py

# Run as: blender -b <filename> -P <this_script> -- <image_path>
import bpy, sys, os
from random import random

# Assume the last argument is image path
output_folder = sys.argv[-1]

for i in range(806, 1000):
    vase = bpy.data.objects["vase"]
    scene = bpy.data.scenes['Scene']

    # Random color
    mat_color = vase.active_material.node_tree.nodes["Glass BSDF"].inputs[0]
    mat_color.default_value[0] = random()
    mat_color.default_value[1] = random()
    mat_color.default_value[2] = random()

    # Random rotation
    # vase.rotation_euler[2] = random() * 360
    # Random geom
    ob = bpy.context.object # active object
    # iterate over points of the curve's first spline
    for j, p in enumerate(ob.data.splines.active.bezier_points):
        p.co.x = random()
        if j != 0:
            p.co.z = random() * 1.5
        p.handle_left.x = random()
        p.handle_left.z = random()
        p.handle_right.x = random()
        p.handle_right.z = random()
    # Render outline
    scene.render.engine = 'BLENDER_RENDER'
    scene.render.use_freestyle = True
    scene.render.filepath = '{}/vase{}-A.png'.format(output_folder, i)
    bpy.ops.render.render(write_still=True)
    # Render realistic
    scene.render.engine = 'CYCLES'
    scene.render.use_freestyle = False
    scene.render.filepath = '{}/vase{}-B.png'.format(output_folder, i)
    bpy.ops.render.render(write_still=True)