# How to build a quarter cylinder using python script?

I am a new Blender user and couldn't find the API for adding a quarter-cylinder object. And I also want to build the object like the picture shows. Thanks if you can help!

I'm not sure exactly what shape you want to make.

This will create an annular sector of a cylinder.

import bpy
import math

def create_cylinder_sector(
height,
angle_start,
angle_end,
inner_segments,
outer_segments,
):
angle_diff = angle_end - angle_start
inner_angle_step = angle_diff / inner_segments
outer_angle_step = angle_diff / outer_segments

verts, faces = [], []

# Verts: Inner arc
if inner_radius > 0:
for i in range(inner_segments + 1):
angle = angle_start + inner_angle_step * i
x = inner_radius * math.cos(angle)
y = inner_radius * math.sin(angle)
verts.append((x, y, 0))
verts.append((x, y, height))
else:
verts.append((0, 0, 0))
verts.append((0, 0, height))

# Verts: Outer arc
for i in range(outer_segments + 1):
angle = angle_end - outer_angle_step * i
x = outer_radius * math.cos(angle)
y = outer_radius * math.sin(angle)
verts.append((x, y, 0))
verts.append((x, y, height))

# Faces: Three sides
for i in range(0, len(verts), 2):
faces.append((i, i+1, i+3, i+2))
# Faces: Fourth side
faces.append((len(verts) - 2, len(verts) - 1, 1, 0))
# Faces: Bottom
faces.append([i for i in range(0, len(verts), 2)])
# Faces: Top
faces.append([i for i in range(len(verts) - 1, 0, -2)])

mesh = bpy.data.meshes.new("CylinderSector")
mesh.from_pydata(verts, [], faces)
mesh.validate()

ob = bpy.data.objects.new(mesh.name, mesh)

return ob

# Example
create_cylinder_sector(
height=1,
angle_start=0.4,
angle_end=1.8,
inner_segments=3,
outer_segments=6,
)


If you want a quarter like this, you can pass inner_radius=0:

create_cylinder_sector(
height=1,
angle_start=0,
angle_end=math.pi/2,
inner_segments=3,  # ignored when inner_radius=0
outer_segments=9,
)

• Oh, it worked! Thank you for your help! Mar 22 at 1:11

To build a quarter cylinder using a Python script, you can follow these steps:

1. Import the required modules:
import matplotlib.pyplot as plt
import numpy as np
from mpl_toolkits.mplot3d import Axes3D

1. Define the radius of the cylinder:
r = 1

1. Define the height of the cylinder:
h = 1

1. Define the number of points to be used for the plot:
n = 100

1. Generate the x, y, and z coordinates for the plot using numpy:
theta = np.linspace(0, np.pi/2, n)
x = r * np.cos(theta)
y = r * np.sin(theta)
z = np.linspace(0, h, n)

1. Create a 3D plot using the generated coordinates:
fig = plt.figure()
ax = fig.add_subplot(111, projection='3d')
ax.plot(x, y, z)
plt.show()


This will generate a quarter-cylinder plot with the specified radius and height. You can adjust the values of r, h, and n to change the dimensions and resolution of the plot.