I'm having a strange issue when I try to create a large VertexList of
lines. My ultimate goal is to render the normal vectors for a heightmap,
but for now I just want to get it working with basic "up" vectors. I'm
getting an "invalid value" error when I call vertexList.draw( GL_LINES ) for
certain sizes of VertexList. A list of 4096 lines (64x64) fails, but 4160
lines (64x65) works fine.
The best explanation would be example code, so I attached a basic pyglet app
that renders a 64x65 grid of lines. Changing the number of columns to 64,
for example, throws the error. Other values, like 1 row of 32 columns, also
fails.
Thoughts?
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import pyglet
from pyglet.gl import *
rows = 64
columns = 65 # changing this to 64 causes an "invalid value"
exception to be thrown on vertexList.draw( GL_LINES )
verts, colors = [], []
for y in xrange(rows):
for x in xrange(columns):
verts += (x,y,0,x,y,1)
colors += (255,255,0,255,255,0)
vertexList = pyglet.graphics.vertex_list( len(verts)/3,
('v3f/static', verts),
('c3B/static', colors) )
window = pyglet.window.Window()
glMatrixMode(GL_MODELVIEW)
glLoadIdentity()
glRotatef( -60, 1, 0, 0)
glTranslatef( -32, 16, -24 )
@window.event
def on_resize(width, height):
glViewport(0, 0, width, height)
glMatrixMode(GL_PROJECTION)
glLoadIdentity()
gluPerspective(90.0, width / float(height), 1.0, 100000.0)
return pyglet.event.EVENT_HANDLED
@window.event
def on_draw():
window.clear()
vertexList.draw( GL_LINES )
pyglet.app.run()
