Showing a dynamic plane

Question

I have written a Python program that continuously returns 4 changing Cartesian coordinates that align to form a square plane that can be at any given orientation; yaw, pitch, or roll. What is the best way to go about displaying the constantly updating plane in 3D space?

Note: This is being done on a Linux machine if that changes anything, however I cannot see how it would.

Answer 1

You can use PyOpenGL for that.

http://pyopengl.sourceforge.net/

It can be installed with pip.

Easiest is to use the "legacy" API and draw a quad.

To change yaw, pitch and roll, use a transformation matrix and glRotate.

You can also use shaders with it and draw up the transformation matrix yourself.

https://en.wikipedia.org/wiki/Rotation_matrix

Example of drawing a textured plane with the OpenGL legacy API:

import sys
import math

from OpenGL.GLUT import *
from OpenGL.GL import *
from OpenGL.GLU import *

def init():
    global image, texName
    glutInitDisplayMode(GLUT_SINGLE | GLUT_RGB | GLUT_DEPTH)
    glShadeModel(GL_FLAT)
    glEnable(GL_DEPTH_TEST)

    import Image, numpy
    img = Image.open('flagEn.bmp') # .jpg, .bmp, etc. also work
    img_data = numpy.array(list(img.getdata()), numpy.int8)

    global texture
    texture = glGenTextures(1)
    glPixelStorei(GL_UNPACK_ALIGNMENT,1)
    glBindTexture(GL_TEXTURE_2D, texture)
    glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT)
    glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT)
    glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR)
    glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR)
    glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, img.size[0], img.size[1], 0, GL_RGB, GL_UNSIGNED_BYTE, img_data)

def display():
    #global texName
    global texture
    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT)
    glEnable(GL_TEXTURE_2D)
    glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_DECAL)
    glBindTexture(GL_TEXTURE_2D, texture)
    glBegin(GL_QUADS)
    glTexCoord2f(0, 0)
    glVertex3f(-2, -1, 0)
    glTexCoord2f(0, 10)
    glVertex3f(-2, 1, 0)
    glTexCoord2f(10, 10)
    glVertex3f(0, 1, 0)
    glTexCoord2f(10, 0)
    glVertex3f(0, -1, 0)
    glTexCoord2f(0, 0)
    glVertex3f(1, -1, 0)
    glTexCoord2f(0, 10)
    glVertex3f(1, 1, 0)
    glTexCoord2f(10, 10)
    glVertex3f(1+math.sqrt(2), 1, -math.sqrt(2))
    glTexCoord2f(10, 0)
    glVertex3f(1+math.sqrt(2), -1, -math.sqrt(2))
    glEnd()
    glFlush()
    glDisable(GL_TEXTURE_2D)

def reshape(w, h):
    glViewport(0, 0, w, h);
    glMatrixMode(GL_PROJECTION);
    glLoadIdentity();
    gluPerspective(60.0, w/h, 1.0, 30.0);
    glMatrixMode(GL_MODELVIEW);
    glLoadIdentity();
    glTranslatef(0.0, 0.0, -3.6);

def keyboard(key, x, y):
    pass

glutInit(sys.argv)
glutInitDisplayMode (GLUT_SINGLE | GLUT_RGB | GLUT_DEPTH | GLUT_MULTISAMPLE)
glutInitWindowSize (500, 500)
glutInitWindowPosition (100, 100)
glutCreateWindow ('texture')
init ()
glutDisplayFunc(display)
glutReshapeFunc(reshape)
glutKeyboardFunc(keyboard)
glutMainLoop()