Blender 2.8, Python 立方体 、照明、カメラ円周移動

今回カメラ移動が主題です。円周沿ったカメラ移動を紹介した youtube 動画 "Blender 2.8 Set Up a Camera Rig and Animate On A Path"これの（前半6m50sec まで）をPython スクリプトにしました。z軸方向移動まだやっていません。(bpy_nh13)
動画はtwitter投稿のこれです
[blender 2.8, python. 1-second movie. 242kB. Camera movement along a circle. ](https://twitter.com/naohiko7/status/1299228942960701446)
なお offset factor の関連は[Insert keyframe to object's Offset Factor Python API]
(https://blender.stackexchange.com/questions/185082/insert-keyframe-to-objects-offset-factor-python-api)を読んで参考にしました
Camera motion along a circle. I have made this Python script based on  "Blender 2.8 Set Up a Camera Rig and Animate On A Path".
(2024.5.3 追記。Blender 4.1.1で動かすには1箇所変更する必要あり 192行目あたりの
["BezierCircle"]を
["BézierCircle"]にすれば動作します。つまりeの上のアクサンテギュです)
![bpy_nh13PNG.png](https://qiita-image-store.s3.ap-northeast-1.amazonaws.com/0/690216/3766d38d-d7fa-4fb2-68b3-8d05b6f3d705.png)


```python3
# bpy_nh13  前半で照明移動を立方体移動　(前半nh12)  後半カメラ設置とカメラ円周移動　(後半nh14) 
import bpy
# DELETE ALL mesh, light, camera, みな削除する2行
for item in bpy.data.objects:
	bpy.data.objects.remove(item)

#立方体 original script は  ---- http://tips.hecomi.com/entry/20120818/1345307205
#拡大参考資料 tatsuruM Qiita https://qiita.com/tatsuruM/items/9d4222c6c7d96b4c5b3c

START = 0
#END   = 100
N     = 4

# Add color cubes
for x in range(0, N):
    for y in range(0, N):
        for z in range(0, N):
            # Add a color cube
            bpy.ops.mesh.primitive_cube_add( location=(x*3, y*3, z*3),size = (1.2) )
            bpy.ops.transform.resize(value=(0.8, 0.1, 2.0))
            bpy.ops.transform.rotate(value= -3.1415/6 ,orient_axis='X')
            #obj = bpy.context.scene.objects.active #(old blender2.7script)
            obj = bpy.context.view_layer.objects.active
            #mat.diffuse_color = (x/N, y/N, z/N)#(old blender2.7script)
            mat = bpy.data.materials.new('Cube')
            mat.diffuse_color = (x/N, y/N, z/N, 0)
            #mat.use_transparency = True #(この行は2.8で試していない)
            #mat.alpha = 0.6 #(この行は2.8で試していない)
            obj.data.materials.append(mat)

# ====== camera (later) ==================

# new lamps （ stack overflow Can you add a light source in blender using python)
# =============="light_spot3"
# create light datablock, set attributes
light_data = bpy.data.lights.new(name="light_spot3", type='SPOT')
light_data.energy = 2000
# create new object with our light datablock
light_object = bpy.data.objects.new(name="light_spot3", object_data=light_data)
# link light object
bpy.context.collection.objects.link(light_object)
# make it active 
bpy.context.view_layer.objects.active = light_object
#change location
light_object.location = (2, -2, 3)
light_object.delta_rotation_euler = (1.6, 0, 0) #ゼロゼロゼロで真下を向く。
# update scene, if needed
dg = bpy.context.evaluated_depsgraph_get() 
dg.update()

# =============="light_spot2"
# create light datablock, set attributes
light_data = bpy.data.lights.new(name="light_spot2", type='SPOT')
light_data.energy = 2000
# create new object with our light datablock
light_object = bpy.data.objects.new(name="light_spot2", object_data=light_data)
# link light object
bpy.context.collection.objects.link(light_object)
# make it active 
bpy.context.view_layer.objects.active = light_object
#change location
light_object.location = (2, -4, 10)
light_object.delta_rotation_euler = (1.5, 0, 0) #ゼロゼロゼロで真下を向く。
# update scene, if needed
dg = bpy.context.evaluated_depsgraph_get() 
dg.update()
# ============== "light_spot1"
# create light datablock, set attributes
light_data = bpy.data.lights.new(name="light_spot1", type='SPOT')
light_data.energy = 3000
# create new object with our light datablock
light_object1 = bpy.data.objects.new(name="light_spot1", object_data=light_data)
# link light object
bpy.context.collection.objects.link(light_object1)
# make it active 
bpy.context.view_layer.objects.active = light_object1
#change location
light_object1.location = (5, -5, 10)
light_object1.delta_rotation_euler = (1.3, 0, -0.3) #ゼロゼロゼロで真下を向く。
# update scene, if needed
dg = bpy.context.evaluated_depsgraph_get() 
dg.update()
# ================

#  MOVE  SPOT LIGHTs  "light_spot1"
bpy.context.scene.frame_start = 1
bpy.context.scene.frame_end = 30
bpy.context.scene.frame_current = 10
# make light ACTIVE 
bpy.context.scene.objects["light_spot3"].select_set(False) # ----- deselect
bpy.context.scene.objects["light_spot2"].select_set(False) # ----- deselect
bpy.context.scene.objects["light_spot1"].select_set(True) #---- select

cdnow  = bpy.context.object          # get ACTIVE object 
bpy.context.scene.frame_current = 1 # set frame to 1
cdnow.location = (5, -6, 8) # set the location
bpy.ops.anim.keyframe_insert_menu(type='Location') # KEY FRAME

bpy.context.scene.frame_current = 10 # set frame to 10
cdnow.location = (5, -6, 10) # set the location
bpy.ops.anim.keyframe_insert_menu(type='Location') # KEY FRAME

bpy.context.scene.frame_current = 20 # set frame to 20
cdnow.location = (2, -6, 10)
bpy.ops.anim.keyframe_insert_menu(type='Location') # KEY FRAME

bpy.context.scene.frame_current = 30 # set frame to 30
cdnow.location = (5, -6, 8)
bpy.ops.anim.keyframe_insert_menu(type='Location') # KEY FRAME
# ================
#  MOVE a LIGHT  mesh with KEY FRAME spot 2 照明の移動  light_spot2
bpy.context.scene.frame_start = 1
bpy.context.scene.frame_end = 30
bpy.context.scene.frame_current = 10

# make POINT  light ACTIVE 
bpy.context.scene.objects["light_spot3"].select_set(False) # ----- deselect
bpy.context.scene.objects["light_spot1"].select_set(False) # ----- deselect
bpy.context.scene.objects["light_spot2"].select_set(True) #---- select

#cdnow  = bpy.context.object          # get ACTIVE object 
cdnow  = bpy.context.scene.objects["light_spot2"]    # get ACTIVE object 

bpy.context.scene.frame_current = 1 # set frame to 1
cdnow.location = (1,-4,1) # set the location
bpy.ops.anim.keyframe_insert_menu(type='Location') # KEY FRAME

bpy.context.scene.frame_current = 10 # set frame to 10
cdnow.location = (1,-4,3) # set the location
bpy.ops.anim.keyframe_insert_menu(type='Location') # KEY FRAME

bpy.context.scene.frame_current = 20 # set frame to 20
cdnow.location = (4,-4,3)
bpy.ops.anim.keyframe_insert_menu(type='Location') # KEY FRAME

bpy.context.scene.frame_current = 30 # set frame to 30
cdnow.location = (1,-4,1)
bpy.ops.anim.keyframe_insert_menu(type='Location') # KEY FRAME
#  ==================
#  MOVE a LIGHT  mesh with KEY FRAME spot 3 照明の移動  light_spot3
bpy.context.scene.frame_start = 1
bpy.context.scene.frame_end = 30
bpy.context.scene.frame_current = 10

# make POINT  light ACTIVE 
bpy.context.scene.objects["light_spot2"].select_set(False) # ----- deselect
bpy.context.scene.objects["light_spot1"].select_set(False) # ----- deselect
bpy.context.scene.objects["light_spot3"].select_set(True)   #---- select

#cdnow  = bpy.context.object          # get ACTIVE object 
cdnow  = bpy.context.scene.objects["light_spot3"]    # get ACTIVE object 

bpy.context.scene.frame_current = 1 # set frame to 1
cdnow.location = (5,-6,1) # set the location
bpy.ops.anim.keyframe_insert_menu(type='Location') # KEY FRAME

bpy.context.scene.frame_current = 10 # set frame to 10
cdnow.location = (9,-6,1) # set the location
bpy.ops.anim.keyframe_insert_menu(type='Location') # KEY FRAME

bpy.context.scene.frame_current = 20 # set frame to 20
cdnow.location = (9,-6,5)
bpy.ops.anim.keyframe_insert_menu(type='Location') # KEY FRAME

bpy.context.scene.frame_current = 30 # set frame to 30
cdnow.location = (5,-6,1)
bpy.ops.anim.keyframe_insert_menu(type='Location') # KEY FRAME
#  ==================
# world - surface - background (背景) 
bpy.data.worlds["World"].node_tree.nodes["Background"].inputs[0].default_value = (0.01, 0.15, 0.25, 1)
bpy.data.worlds["World"].node_tree.nodes["Background"].inputs[1].default_value = 0.7            

#  ================== ================= camera movement
#bpy.ops.mesh.primitive_monkey_add(size=2, enter_editmode=False, align='WORLD', location=(0, 0, 0))

bpy.ops.curve.primitive_bezier_circle_add(enter_editmode=False, align='WORLD', location=(0, 0, 0))
bpy.context.object.scale[0] = 6
bpy.context.object.scale[1] = 6
bpy.ops.object.empty_add(type='CUBE', align='WORLD', location=(0, 0, 0))
bpy.ops.object.camera_add(enter_editmode=False, align='VIEW', location=(0, 0, 0), rotation=(0, 0, 0))

bpy.data.objects['Empty'].select_set(True)
bpy.data.objects['Camera'].select_set(True)

bpy.context.view_layer.objects.active = bpy.data.objects['Empty']
bpy.ops.object.parent_set(type='OBJECT')

bpy.data.objects['Camera'].select_set(False)
bpy.data.objects['Empty'].select_set(True)

bpy.ops.object.constraint_add(type='FOLLOW_PATH')
bpy.context.object.constraints["Follow Path"].target = bpy.data.objects["BezierCircle"]

bpy.context.object.constraints["Follow Path"].use_curve_follow = True
bpy.context.object.constraints["Follow Path"].use_fixed_location = True

bpy.data.objects['Empty'].select_set(False)
bpy.data.objects['Camera'].select_set(True)

bpy.ops.object.constraint_add(type='TRACK_TO')
#bpy.context.object.constraints["Track To"].target = bpy.data.objects["Suzanne"]
bpy.context.object.constraints["Track To"].target = bpy.data.objects["Cube.016"]
bpy.context.object.constraints["Track To"].up_axis = 'UP_Y'
bpy.context.object.constraints["Track To"].track_axis = 'TRACK_NEGATIVE_Z'  #5m00sec
#Camera Keyframe #(Insert keyframe to object's Offset Factor Python API - stack exchange)
bpy.data.objects['Camera'].select_set(False)
bpy.data.objects['Empty'].select_set(True)
bpy.context.scene.frame_current = 1
bpy.context.object.constraints["Follow Path"].offset_factor = 0
ob = bpy.context.object
# ob.constraints['Follow Path']
# bpy.data.objects['Empty'].constraints["Follow Path"]
# [bpy.data.objects['Empty'].constraints["Follow Path"]]
con = ob.constraints.get("Follow Path")
con.offset_factor = 0.0
con.keyframe_insert("offset_factor", frame=1)
con.offset_factor = 0.1
con.keyframe_insert("offset_factor", frame=8)
con.offset_factor = 0.15
con.keyframe_insert("offset_factor", frame=16)
con.offset_factor = 0.2
con.keyframe_insert("offset_factor", frame=18)
con.offset_factor = 0.0
con.keyframe_insert("offset_factor", frame=30)
# ===== end of bph_13 (2020.8.28)


```