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PONested loop apparently not looping in PyOpenGL
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  1. PONested loop apparently not looping in PyOpenGL
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    copied!<p>I'm pretty sure that this is specifically my error in Python's looping syntax, but I can't for the life of me figure out what's wrong.</p> <p>I'm using Python on OSX with PyOpenGL and GLUT for a very basic program: it's intended to draw a 3D grid around (0,0,0). I've managed to produce the 2D grid at a given elevation (so there's a grid at y=10 from x=-10 to x=10 and from z=-10 to z=10), but I can't make it iterate through the y-coordinate.</p> <p><a href="http://i.imgur.com/zvsnv7k.png" rel="nofollow">This screenshot should help to show what I mean</a>. My intended scenario is that there would be ten of these flat grids above y=0, and ten below, forming a cube. Later on, too, I'll extend it to lines in the y-axis, but I've semi-achieved that before (same problem as I'm having now) so no big deal. </p> <p>Would someone please let me know what the problem is with my code? It seems like a fairly simple issue, but I've wasted a few hours on this and would really appreciate some help.</p> <p>A couple of disclaimers:</p> <p>I'm aware that GLUT is old tech and that most of this code is deprecated, but this project isn't about that.</p> <p>I'll need to go through and change the "-10 to 10" constants in the z- and x-coords at some point, but that method should be straightforward once I've got this y thing working.</p> <pre><code>from OpenGL.GL import * from OpenGL.GLUT import * from OpenGL.GLU import * grid_range = 10 def DrawGLScene( ): i = 0 j = 0 fl_range = float(grid_range) while (j &lt;= (grid_range*2) ): while (i &lt;= (grid_range*2) ): # x grid glColor3f( 0.0, 1.0, 0.0 ) glBegin( GL_LINES ) glVertex3f( grid_range - i, grid_range - j, -10 ) glVertex3f( grid_range - i, grid_range - j, 10 ) glEnd( ) # z grid glColor3f( 0.0, 0.0, 1.0 ) glBegin( GL_LINES ) glVertex3f( -10, grid_range - j, grid_range - i ) glVertex3f( 10, grid_range - j, grid_range - i ) glEnd( ) i += 1 j += 1 </code></pre>
 

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