[Blender x Python] How to make an animation

table of contents

0. Animation operations
1. Move the object to the specified coordinates
2. Move the object to random coordinates
3. Use trigonometric functions to move objects
4. Change the size of the object
5. Change the position and size of the object at the same time Finally

0. Animation operations

0-1. Creating animation

Open Scripting ↓ Name it like ~ .py ↓ Write code and press execute button

0-2. Execution of animation

Go to animation and press the play button

• You can also play and stop with the space key.

0-3. Delete animation

In 3Dviewport, press N ↓ Right-click at the key insertion point (green) ↓ Press clear key frame ↓ Press the N key to close the tab

0-4. Creating a new script

Press the Text button ↓ Press the New button ↓ Name it like ~ .py

0-5. Select a script

Press the button with a pattern like a document ↓ Select a script

1. Move the object to the specified coordinates

• Add the objects you want to animate to the 3D viewport yourself. Please refer to Getting Started with Blender Python etc. for how to add. Just add one sentence like bpy.ops.mesh. ~~~ _add (). Of course, you can choose from shift + A and add it.

anim01.py

import bpy

#Specify the coordinates of the target
positions = (0,3,2),(4,1,6),(3,-5,1),(3,10,1),(1,8,1)
#Specify the starting coordinates
start_pos = (0,0,0)

#Assign the object in the 3D viewport to the variable ob
#ob = bpy.data.objects["Cube"]It is also possible to move a specific thing like
ob = bpy.context.object

#Specify the start frame
frame_num = 0

#Repeat the process of moving to the target coordinates
for p in positions:
    #Set the start frame
    bpy.context.scene.frame_set(frame_num)
    #Substitute the target coordinate value for the variable location
    ob.location = p
    #Insert keyframe
    ob.keyframe_insert(data_path = "location",index = -1)
    #Shift the frame by 20
    frame_num += 20

○Point : keyframe_insert A function that inserts keyframes. For the argument, use the information to be used (data_path), array format (index), etc. index is

-1 → x, y, z all 0 → x 1 → y 2 → z

It is also possible to operate with reference to a specific axis.

2. Move the object to random coordinates

anim02.py

import bpy
#Use the randint function in a random library
from random import randint

#Use objects in 3D viewport(This time Sphere)
ob = bpy.data.objects["Sphere"]
frame_number = 0

#Repeat the process 50 times
for i in range(0,50):
    
    #Randomly select an integer from the range from the first argument to the second argument
    x = randint(-20,20)
    y = randint(-40,20)
    z = randint(-20,60)
    
    bpy.context.scene.frame_set(frame_number)
    ob.location = (x,y,z)
    ob.keyframe_insert(data_path = "location",index = -1)
    frame_number += 5

3. Use trigonometric functions to move objects

anim03.py

import bpy
#Prepare the sin function of the math library
from math import sin

start_pos = (0,0,0)
ob = bpy.context.object
frame_num = 0

for i in range(0,50):
    bpy.context.scene.frame_set(frame_num)
    #Specify the coordinates in the variable location
    ob.location = (0,i,sin(i))
    ob.keyframe_insert(data_path = "location",index = -1)
    frame_num += 10

4. Change the size of the object

anim04.py

import bpy

scales = (1,3,2),(4,1,6),(3,5,1),(3,10,1),(1,8,1)
start_pos = (0,0,0)
ob = bpy.context.object
frame_num = 0

for s in scales:
    bpy.context.scene.frame_set(frame_num)
    ob.scale = s
    #Insert the key based on the size information
    ob.keyframe_insert(data_path = "scale",index = -1)
    frame_num += 20

5. Change the position and size of the object at the same time

anim05.py

import bpy
from math import sin

start_pos = (0,0,0)
ob = bpy.context.object
frame_num = 0

for i in range(0,100):
    bpy.context.scene.frame_set(frame_num)
    ob.location = (0,-i,sin(i) * 3)
    ob.scale = (1,1,1 + sin(i))
    ob.keyframe_insert(data_path = "location",index = -1)
    ob.keyframe_insert(data_path = "scale",index = -1)
    frame_num += 5

Finally

Thank you for reading. Please feel free to contact us if you have any corrections!