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How to Read .obj Files with OpenGL in Python

Oct 14, 2024

Are you interested in rendering 3D models using Python and OpenGL? .obj files are a popular file format for 3D models, and in this article, we'll explore how to read .obj files and render them using OpenGL in Python.

To get started, you'll need to have the PyOpenGL library installed. You can install it using pip:

```bash

pip install PyOpenGL

```

Once you have PyOpenGL installed, you can use the following code to read the .obj file and render the 3D model using OpenGL:

```python

import glm

from OpenGL.GL import *

def load_obj(filename):

vertices = []

faces = []

with open(filename, 'r') as file:

for line in file:

if line.startswith('v '):

vertex = list(map(float, line.strip().split()[1:]))

vertices.append(vertex)

elif line.startswith('f '):

face = list(map(lambda x: int(x.split('/')[0]) - 1, line.strip().split()[1:]))

faces.append(face)

return vertices, faces

def render_obj(vertices, faces):

glBegin(GL_TRIANGLES)

for face in faces:

for vertex_index in face:

glVertex3fv(vertices[vertex_index])

glEnd()

# Load the .obj file

vertices, faces = load_obj('model.obj')

# Render the 3D model

glClearColor(0.0, 0.0, 0.0, 1.0)

glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT)

glMatrixMode(GL_PROJECTION)

glLoadIdentity()

gluPerspective(45, 800 / 600, 0.1, 100.0)

glMatrixMode(GL_MODELVIEW)

glLoadIdentity()

gluLookAt(2, 2, 2, 0, 0, 0, 0, 1, 0)

glEnable(GL_DEPTH_TEST)

render_obj(vertices, faces)

# Display the rendered 3D model

# ...

```

In the code above, we first define a function `load_obj` to parse the .obj file and extract the vertices and faces. Then, we define a function `render_obj` to render the 3D model using OpenGL commands. Finally, we load the .obj file and render the 3D model using the OpenGL pipeline.

With this code, you can now read .obj files and render 3D models using OpenGL in Python. Happy coding!

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