Re: [PyOpenGL-Users] get Translation inside matrix stack

[Prashant S. <ani...@ya...>]

I am sorry but I didn't get any success with your code. I tried this:

glPushMatrix()
glTranslate(5,0,0)
glTranslate(10,0,0)
glTranslate(5,0,0)
# To get total increment of x axis(which is 5+10+5=20) 
modelview = glGetFloatv( GL_MODELVIEW_MATRIX )
print modelview
glPopMatrix()

but I am getting this:
[[1.0, 0.0, 0.0, 0.0], [0.0, 1.0, 0.0, 0.0], [0.0, 0.0, 1.0, 0.0], [0.0, 0.0, 0.0, 1.0]]
Which does,'t solve my problem.


----- Original Message ----
From: Prashant Saxena <ani...@ya...>
To: Gary Herron <gh...@is...>
Sent: Tuesday, July 22, 2008 9:59:38 PM
Subject: Re: [PyOpenGL-Users] get Translation inside matrix stack


I am sorry but I didn't get any success with your code. I tried this:

glPushMatrix()
glTranslate(5,0,0)
glTranslate(10,0,0)
glTranslate(5,0,0)
# To get total increment of x axis(which is 5+10+5=20) 
modelview = glGetFloatv( GL_MODELVIEW_MATRIX )
print modelview
glPopMatrix()

but I am getting this:
[[1.0, 0.0, 0.0, 0.0], [0.0, 1.0, 0.0, 0.0], [0.0, 0.0, 1.0, 0.0], [0.0, 0.0, 0.0, 1.0]]
Which does,'t solve my problem.




----- Original Message ----
From: Gary Herron <gh...@is...>
Cc: pyo...@li...
Sent: Tuesday, July 22, 2008 8:48:24 PM
Subject: Re: [PyOpenGL-Users] get Translation inside matrix stack

Shantytown Saxena wrote:
>
> glPushMatrix()
> glTranslate(5,0,0)
> glTranslate(10,0,0)
> glTranslate(5,0,0)
> # How do I get here total increment of x axis(which is 5+10+5=20) 
> before I Pop up.
> glPopMatrix()

All the transformations are recorded by OpenGL in a 4x4 matrix.
You can recover that matrix like this:

    buff = (ctypes.c_double*16)()
    pyglet.gl.glGetDoublev(stack, buff)

If you started with the identity and did no other transformations you'll 
find the 20 in that 4x4 array.

In either the [0,3] or [3,0] element.  (I've forgotten which way Opengl 
stores the array now.)

Gary Herron


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