On 24/11/10 16:10, Will wrote:
Hello, I am trying to mix 2d and 3d in opengl in pyglet, i.e. draw a
3d scene then switch to orthographic projection and draw stuff over
the top. I draw the 3d stuff, push the projection matrix to the
stack, do a glOrtho projection matrix, draw the 2d stuff, then pop
the previous matrix off the stack.
The 3d stuff draws fine but for some reason the 2d part isn't drawing
at all, even on its own.
Here's the code:
#snip#
def set2d(self):
glDisable(GL_DEPTH_TEST)
# store the projection matrix to restore later
glMatrixMode(GL_PROJECTION)
glPushMatrix()
# load orthographic projection matrix
glLoadIdentity()
far = 8192
"far" is positive so your clipping points are at the camera and 8192
behind it.
glOrtho(-self.width / 2., self.width / 2., -self.height / 2.,
self.height / 2., 0, far)
# reset modelview
glMatrixMode(GL_MODELVIEW)
glLoadIdentity()
#glClear(GL_COLOR_BUFFER_BIT)
def unSet2d(self):
# load back the projection matrix saved before
glMatrixMode(GL_PROJECTION)
glPopMatrix()
def draw2d(self):
z=-6
n=100
glTranslatef(0, 0.0, -z)
glBegin(GL_TRIANGLES)
glVertex3f(0.0, n, 0.0)
glVertex3f(-n, -n, 0)
glVertex3f(n, -n, 0)
glEnd()
You then translate forward 6, ie past the near clipping point and draw
your triangle.
HTH.
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