A
Adeola Bannis
Hi everyone,
I'm doing a project using wxPython and pyopengl, and I seem to have a
problem rendering textures. This is code that worked before my hard
drive had a meltdown, but not since I re-installed everything.
I've determined the problem is in the OpenGL part of my program. I do
some calculations to generate a 2D numpy array that holds the image
data, and pylab.imshow() shows me the image as it is meant to be. I
used the same algorithm in Octave and MATLAB, and all are giving me
the right picture.
However, using pyOpenGL and the numpyhandler functions (http://cours-
info.iut-bm.univ-fcomte.fr/docs/python/OpenGL/
OpenGL.arrays.numpymodule.NumpyHandler-class.html) doesn't seem to
work. I get a garbled screen pocked with black pixels. I am including
my openGL code below. What am I doing wrong?
And yes, I did make the dtype of my array 'float32'.
-------code snippets------
import wx
from wx.glcanvas import GLCanvas
from OpenGL.GLU import *
from OpenGL.GL import *
from OpenGL.arrays.numpymodule import NumpyHandler
PC = 1
RI = 0
class myGLCanvas(GLCanvas):
def __init__(self, parent):
GLCanvas.__init__(self, parent,-1)
wx.EVT_PAINT(self, self.OnPaint)
self.init = 0
self.mode = -1
# making a texture for the range image
self.texture = glGenTextures(1)
# making a spot for the point cloud points
self.cloud = None
return
def OnPaint(self,event):
dc = wx.PaintDC(self)
self.SetCurrent()
if not self.init:
self.InitGL()
self.init = 1
self.OnDraw()
return
def OnDraw(self):
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT)
if self.mode == RI:
self.drawRange()
elif self.mode == PC:
self.drawCloud()
def InitGL(self):
glClearColor(0.0, 0.0, 0.0, 0.0);
glClearDepth(1.0)
glEnable(GL_DEPTH_TEST)
glDepthFunc(GL_LEQUAL)
glClear(GL_COLOR_BUFFER_BIT)
glPixelStorei(GL_UNPACK_ALIGNMENT, 1)
glPixelStorei(GL_PACK_ALIGNMENT, 1)
#NTSC colour scales...
glPixelTransferf(GL_RED_SCALE, 0.299);
glPixelTransferf(GL_GREEN_SCALE, 0.587);
glPixelTransferf(GL_BLUE_SCALE, 0.114);
glMatrixMode(GL_PROJECTION)
glLoadIdentity()
glOrtho(0.0,1.0,0,1.0,-1.0,1.0)
glMatrixMode(GL_MODELVIEW)
glLoadIdentity()
return
def rangeImage(self, image):
glBindTexture(GL_TEXTURE_2D, self.texture)
glTexEnvf( GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE )
glTexParameterf (GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER,
GL_LINEAR)
glTexParameterf (GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR)
glTexParameterf (GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT)
glTexParameterf (GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT)
# flatten it into a list so the OpenGL calls work
n = NumpyHandler()
fI = image.flatten()
flatImage = n.dataPointer(n.contiguous(fI))
print n.contiguous(fI)
gluBuild2DMipmaps(GL_TEXTURE_2D, 1, image.shape[0]+1,
image.shape[1]+1,
GL_LUMINANCE, GL_FLOAT, flatImage)
self.mode = RI
self.OnDraw()
def drawRange(self):
''' Controls the actual drawing of the range image'''
glMatrixMode(GL_MODELVIEW)
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT)
glColor3f(1.0,1.0,1.0)
glEnable(GL_TEXTURE_2D)
glBindTexture(GL_TEXTURE_2D, self.texture)
glBegin(GL_TRIANGLE_FAN)
glTexCoord2d(1,1); glVertex3f(0.0, 0.0, 0.0)
glTexCoord2d(1,0); glVertex3f(0.0, 1.0, 0.0)
glTexCoord2d(0,0); glVertex3f(1.0, 1.0, 0.0)
glTexCoord2d(0,1); glVertex3f(1.0, 0.0, 0.0)
glEnd()
self.SwapBuffers()
--------end snippet-----------
I'm doing a project using wxPython and pyopengl, and I seem to have a
problem rendering textures. This is code that worked before my hard
drive had a meltdown, but not since I re-installed everything.
I've determined the problem is in the OpenGL part of my program. I do
some calculations to generate a 2D numpy array that holds the image
data, and pylab.imshow() shows me the image as it is meant to be. I
used the same algorithm in Octave and MATLAB, and all are giving me
the right picture.
However, using pyOpenGL and the numpyhandler functions (http://cours-
info.iut-bm.univ-fcomte.fr/docs/python/OpenGL/
OpenGL.arrays.numpymodule.NumpyHandler-class.html) doesn't seem to
work. I get a garbled screen pocked with black pixels. I am including
my openGL code below. What am I doing wrong?
And yes, I did make the dtype of my array 'float32'.
-------code snippets------
import wx
from wx.glcanvas import GLCanvas
from OpenGL.GLU import *
from OpenGL.GL import *
from OpenGL.arrays.numpymodule import NumpyHandler
PC = 1
RI = 0
class myGLCanvas(GLCanvas):
def __init__(self, parent):
GLCanvas.__init__(self, parent,-1)
wx.EVT_PAINT(self, self.OnPaint)
self.init = 0
self.mode = -1
# making a texture for the range image
self.texture = glGenTextures(1)
# making a spot for the point cloud points
self.cloud = None
return
def OnPaint(self,event):
dc = wx.PaintDC(self)
self.SetCurrent()
if not self.init:
self.InitGL()
self.init = 1
self.OnDraw()
return
def OnDraw(self):
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT)
if self.mode == RI:
self.drawRange()
elif self.mode == PC:
self.drawCloud()
def InitGL(self):
glClearColor(0.0, 0.0, 0.0, 0.0);
glClearDepth(1.0)
glEnable(GL_DEPTH_TEST)
glDepthFunc(GL_LEQUAL)
glClear(GL_COLOR_BUFFER_BIT)
glPixelStorei(GL_UNPACK_ALIGNMENT, 1)
glPixelStorei(GL_PACK_ALIGNMENT, 1)
#NTSC colour scales...
glPixelTransferf(GL_RED_SCALE, 0.299);
glPixelTransferf(GL_GREEN_SCALE, 0.587);
glPixelTransferf(GL_BLUE_SCALE, 0.114);
glMatrixMode(GL_PROJECTION)
glLoadIdentity()
glOrtho(0.0,1.0,0,1.0,-1.0,1.0)
glMatrixMode(GL_MODELVIEW)
glLoadIdentity()
return
def rangeImage(self, image):
glBindTexture(GL_TEXTURE_2D, self.texture)
glTexEnvf( GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE )
glTexParameterf (GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER,
GL_LINEAR)
glTexParameterf (GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR)
glTexParameterf (GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT)
glTexParameterf (GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT)
# flatten it into a list so the OpenGL calls work
n = NumpyHandler()
fI = image.flatten()
flatImage = n.dataPointer(n.contiguous(fI))
print n.contiguous(fI)
gluBuild2DMipmaps(GL_TEXTURE_2D, 1, image.shape[0]+1,
image.shape[1]+1,
GL_LUMINANCE, GL_FLOAT, flatImage)
self.mode = RI
self.OnDraw()
def drawRange(self):
''' Controls the actual drawing of the range image'''
glMatrixMode(GL_MODELVIEW)
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT)
glColor3f(1.0,1.0,1.0)
glEnable(GL_TEXTURE_2D)
glBindTexture(GL_TEXTURE_2D, self.texture)
glBegin(GL_TRIANGLE_FAN)
glTexCoord2d(1,1); glVertex3f(0.0, 0.0, 0.0)
glTexCoord2d(1,0); glVertex3f(0.0, 1.0, 0.0)
glTexCoord2d(0,0); glVertex3f(1.0, 1.0, 0.0)
glTexCoord2d(0,1); glVertex3f(1.0, 0.0, 0.0)
glEnd()
self.SwapBuffers()
--------end snippet-----------