Minecraft Blender parameters for automated rendering of chunks from jMc2Obj.

mc_blender_render.py

import bpy, math

object_file = "%%OBJ%%" # complete path
output_file = "%%PNG%%" # use "//filename.ext" for local path

# Clean canvas
for object in bpy.data.objects:
	object.select = True

bpy.ops.object.delete()

# Import the mc2obj file
bpy.ops.import_scene.obj(filepath = object_file)
bpy.data.objects["Mesh"].select = True

# Fix transparency of materials
for item in bpy.data.materials:
	item.use_transparent_shadows = True
	if (item.alpha < 1.0):
		item.use_transparency = True
		item.transparency_method = "RAYTRACE"
	else:
		item.use_transparency = False

# Fix textures (may return an error for some)
for item in bpy.data.textures:
	if item.type == 'IMAGE':
		item.filter_type = 'BOX'
		item.filter_size = 0.1

# Create emitters
half_lights = ["lava", "lava_flowing", "redstone_torch_on", "restone_dust_on", "redstone_wire_on", "rails_powered_on"]
full_lights = ["torch_flame", "fire", "redstone_lamp_on", "glowstone"]

for light in half_lights:
	if light in bpy.data.materials:
		bpy.data.materials[light].emit = 1.0

for light in full_lights:
	if light in bpy.data.materials:
		bpy.data.materials[light].emit = 2.0

# Add a camera to the scene
bpy.ops.object.camera_add(location = (-16, -16, 128), rotation = (math.pi / 12, 0, 0 - math.pi / 4) ) # radians
bpy.context.scene.camera = bpy.data.objects['Camera'] # set the camera otherwise you can't edit it
bpy.data.scenes["Scene"].camera.data.lens = 12 # 10 mm lens

# Configure lighting
#bpy.ops.object.lamp_add(type = "SUN", location = (96,-64,96) )
#bpy.data.lamps['Sun'].energy = 0.5
#bpy.data.lamps['Sun'].shadow_method = "RAY_SHADOW"
#bpy.data.lamps['Sun'].shadow_ray_samples = 8 # enough?

bpy.data.scenes["Scene"].world.light_settings.use_environment_light = True
bpy.data.scenes["Scene"].world.light_settings.environment_energy = 0.0625

bpy.data.scenes["Scene"].world.light_settings.use_indirect_light = True
bpy.data.scenes["Scene"].world.light_settings.indirect_factor = 25.0
bpy.data.scenes["Scene"].world.light_settings.indirect_bounces = 4
bpy.data.scenes["Scene"].world.light_settings.gather_method = 'APPROXIMATE'
bpy.data.scenes["Scene"].world.light_settings.passes = 0
bpy.data.scenes["Scene"].world.light_settings.use_falloff = True
bpy.data.scenes["Scene"].world.light_settings.falloff_strength = 0.0625

# Configure the output
bpy.data.scenes["Scene"].render.resolution_x = 1920
bpy.data.scenes["Scene"].render.resolution_y = 1080
bpy.data.scenes["Scene"].render.resolution_percentage = 100
bpy.data.scenes["Scene"].render.filepath = output_file
bpy.data.scenes["Scene"].render.use_antialiasing = True
bpy.data.scenes["Scene"].render.antialiasing_samples = '8'

# Depth of field
# Configure compositing nodes
bpy.data.scenes["Scene"].use_nodes = True
tree = bpy.context.scene.node_tree

# Add/reference the nodes
df = tree.nodes.new('DEFOCUS')
rendering = tree.nodes['Render Layers']
compositing = tree.nodes['Composite']

# Join them up
tree.links.new(rendering.outputs[0], df.inputs[0]) # Image
tree.links.new(rendering.outputs[2], df.inputs[1]) # Z
tree.links.new(df.outputs[0], compositing.inputs[0]) # Image

# Configure defocusing
bpy.data.scenes["Scene"].camera.data.dof_distance = 64
df.bokeh = 'CIRCLE'
df.f_stop = 1.0
df.use_zbuffer = True
df.use_preview = False
df.samples = 32 # preview sometimes ignored

# Do work
bpy.ops.render.render(write_still = True)

Camera lens setting is failing, and for some reason the GUI displays angles in degrees, but the software works in radians. Conversion needed.