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How to View OBJ Files with OpenGL in Python

Sep 30, 2024

If you're looking to work with OBJ files in Python, OpenGL is a powerful tool for rendering 3D models. Here's a simple guide to help you get started.

First, make sure you have the PyOpenGL library installed. You can do this using pip:

```python

pip install PyOpenGL

```

Next, you'll need to load the OBJ file using a parsing library such as PyWavefront or PyAssimp. Once you have the data from the OBJ file, you can use OpenGL to render and display the 3D model.

Here's a basic example using PyOpenGL:

```python

import pygame

from OpenGL.GL import *

from OpenGL.GLUT import *

from OpenGL.GLU import *

import pywavefront

# Load OBJ file

scene = pywavefront.Wavefront('model.obj')

def draw():

glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT)

glLoadIdentity()

gluPerspective(45, (display[0]/display[1]), 0.1, 50.0)

glTranslatef(0.0, 0.0, -5)

for name, material in scene.materials.items():

mtl = (material.diffuse, material.ambient, material.specular, material.shininess)

glMaterialfv(GL_FRONT_AND_BACK, GL_AMBIENT, mtl[1] + (1.0,))

glMaterialfv(GL_FRONT_AND_BACK, GL_DIFFUSE, mtl[0] + (1.0,))

glMaterialfv(GL_FRONT_AND_BACK, GL_SPECULAR, mtl[2] + (1.0,1.0))

glMaterialfv(GL_FRONT_AND_BACK, GL_SHININESS, mtl[3])

for mesh in scene.mesh_list:

glBegin(GL_TRIANGLES)

for face in mesh.faces:

for vertex_i in face:

glVertex3fv(scene.vertices[vertex_i])

glEnd()

pygame.init()

display = (800, 600)

pygame.display.set_mode(display, DOUBLEBUF|OPENGL)

glEnable(GL_DEPTH_TEST)

while True:

for event in pygame.event.get():

if event.type == pygame.QUIT:

pygame.quit()

quit()

draw()

pygame.display.flip()

pygame.time.wait(10)

```

This is a basic example of loading and rendering an OBJ file using OpenGL in Python. With a bit of customization, you can create stunning visualizations and interactive 3D models. Have fun exploring the world of 3D modeling and rendering with Python and OpenGL!

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