Hi Philip et al.
Your code looks like it should provide what I need! However I cannot find
the arglCameraView() function? - even if I include the gsub_lite.h library.
If I substitute in the argConvGlPara() function then it appears to work
successfully however my object is a long way in the distance, which suggests
that I need to use this new function so that I can scale the transformaion.
As far as I can tell I am using ARToolkit version 2.71.2 so according to the
API the function should exist..
Many thanks for your help!
Chris
________________________________________
From: Philip Lamb [mailto:phil@e ..........]
Sent: 18 June 2006 22:12
To: Chris Hughes
Cc: artoolkit@h ..................
Subject: Re: Converting the ARToolkit Matrix notation into VTK notation
On 19/06/2006, at 1:46 AM, Chris Hughes wrote:
I am looking to write a function to convert the ARToolkit Matrix into the
'eye position', 'look at point' and 'up vector' used in VTK. Has anyone got
any knowledge about how to do this? Or can you point me towards any
information about the ARToolkit Matrix in general?
Here's one way of doing it:
float scalef = 1.0f;
GLdouble m[16];
GLdouble eyepos[3], lookat[3], up[3];
// See detection loop in Idle() in simpleLite.c for context of the line
below.
arGetTransMat(&(marker_info[k]), patt_centre, patt_width, patt_trans);
// Make patt_trans into a standard OpenGL HCT matrix (N.B.:column-major).
arglCameraView(patt_trans, m, scalef);
// This treats the marker as lying in the x-y plane, with the +z axis
pointing towards the observer.
eyepos[0] = m[12]; eyepos[1] = m[13]; eyepos[2] = m[14];
lookat[0] = eyepos[0] - m[8]; lookat[1] = eyepos[1] - m[9]; lookat[2] =
eyepos[2] - m[10];
up[0] = m[4]; up[1] = m[5]; up[2] = m[6];
Cheers,
Phil.
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