Python on GameSweetGame

Applying Custom Motion Capture Animations to Your Game

Tue, 20 Jan 2026 11:00:00 +0900

I want to make a polished action game. Let’s custom-make the attack animations.

I referenced this motion capture project on GitHub:

Using a Python pose estimation library, you can extract keypoint coordinates for head, shoulders, arms, legs, etc. These coordinates are then converted for use in Unity.

Overall Flow

External pose data (33 keypoints)
Convert to Unity coordinate system
Point objects (P0~P32)
Estimate rotation relative to bind direction
Root direction (yaw + slight tilt) estimation with smoothing

Normalizing File Values + Axis Correction

float px = float.Parse(toks[i * 3 + 0]) / scaleXY;
float py = float.Parse(toks[i * 3 + 1]) / scaleXY;
float pz = float.Parse(toks[i * 3 + 2]) / scaleZ;

Different XY/Z scales: Video-based pose estimation has much more noise in depth (Z)
invertZ: Corrects coordinate system difference between MediaPipe and Unity

Storing Bind Rotation

lUpperBind = lUpperArm.rotation;

Reference rotation from the T-Pose.

Automatic Bind Direction Estimation

lUpperBindDir = (lLowerArm.position - lUpperArm.position).normalized;

The core concept: which direction was this bone originally facing?

UpperArm → LowerArm direction = bone’s reference forward vector

A bit rough, but the motion came through. Now it’s time to refine it in Blender.

Python Star Pattern with While Loop

Sun, 28 Nov 2021 00:00:00 +0900

Instead of a simple star pattern, let’s take user input to decide how many rows to print.

☆
☆☆
☆☆☆
☆☆☆☆
☆☆☆☆☆

i = int(input("Enter the number of rows: "))
star = 1
while True:
 print("☆" * star)
 if star == i:
 break
 star += 1

input() returns a string by default. Convert it to int.
while True creates an infinite loop.
Each iteration prints stars and increments by 1. When it matches the input, break stops the loop.

Entering 7 prints stars from 1 to 7 rows.

Python: Search Lists and Strings with the "in" Operator

Wed, 24 Nov 2021 00:00:00 +0900

result1 = 1 in [1, 2, 3]
result2 = 5 in [1, 2, 3]

result3 = 1 not in [1, 2, 3]
result4 = 5 not in [1, 2, 3]

result5 = "j" in "python"
result6 = "y" in "python"
result7 = "y" not in "python"

print(result1) # True
print(result2) # False
print(result3) # False
print(result4) # True
print(result5) # False
print(result6) # True
print(result7) # False

result1: Is 1 in [1, 2, 3]? → Yes → True
result2: Is 5 in [1, 2, 3]? → No → False
not in is simply the opposite
Strings work just like lists
result5: Is “j” in “python”? → No → False