円柱をｚ軸からｘ軸に回転させる なぜか Y軸

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円柱をｚ軸からｘ軸に回転させるには、次の手順を実行することができます。

1. 「cylinder.rotation_euler」を次のように変更します。

lua
cylinder.rotation_euler = (math.pi/2, 0, math.pi/2)

これにより、円柱がｚ軸とｘ軸の間に90度回転し、ｘ軸に平行になります。

2. 「start_pos」と「end_pos」も次のように変更します。

makefile
start_pos = (0.0, -120.0, 0.0)
end_pos = (0.0, -30.0, 0.0)

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import bpy

import math

# シリンダーを作成する

bpy.ops.mesh.primitive_cylinder_add(radius=0.5, depth=60.0, location=(-120.0, 0.0, 0.0))

cylinder = bpy.context.object

# シリンダーの回転と位置を設定する

cylinder.rotation_euler = (math.pi/2, 0, 0)

cylinder.location = (0.0, 0.0, 120.0)

# Set start and end frames

start_frame = 1

end_frame = start_frame + 200

# Define the start and end positions

start_pos = (-120.0, 0.0, 0.0)

end_pos = (-30.0, 0.0, 0.0)

# Calculate the distance between start_pos and end_pos

distance = abs(math.sqrt((end_pos[0]-start_pos[0])**2 + (end_pos[1]-start_pos[1])**2 + (end_pos[2]-start_pos[2])**2))

# Set the speed multiplier

vvv_velocity = 2.0

# Calculate the velocity required to move the sphere at a constant speed

velocity = distance / (end_frame - start_frame) * vvv_velocity

# Move the sphere and cylinder from start_pos to end_pos at a constant speed

for i in range(start_frame, end_frame + 1):

    bpy.context.scene.frame_set(i)

    bpy.context.object.location = tuple(s + (e-s)*((i-start_frame)*velocity/distance) for s,e in zip(start_pos, end_pos))

    bpy.context.object.keyframe_insert(data_path="location", index=-1)

    bpy.context.object.keyframe_insert(data_path="scale", index=-1)

# Stop the sphere and cylinder from moving after reaching the end position

bpy.context.scene.frame_set(end_frame)

bpy.context.object.keyframe_insert(data_path="location", index=-1)

bpy.context.object.keyframe_insert(data_path="scale", index=-1)

# Set the waiting period

wait_frames = 40

end_frame += wait_frames

# Set the current frame to the end_frame

current_frame = end_frame

# Keep the sphere and cylinder at the end position and repeat the animation

repeat_frames = end_frame + 200

while True:

    current_frame += 1

    

    # Insert a keyframe at the current frame for the sphere and cylinder's location and scale

    bpy.context.scene.frame_set(current_frame)

    bpy.context.object.location = end_pos

    bpy.context.object.keyframe_insert(data_path="location", index=-1)

    bpy.context.object.keyframe_insert(data_path="scale", index=-1)

    

    # Stop the loop if current_frame reaches repeat_frames

    if current_frame == repeat_frames:

        break

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