Hi Robert,
I know, i'm using transposed matrix, if it could have been this...
I've made several tests, that issued to two behavior of the trackball.
I hope that will help you to help me... :-)
First test using the following code :
_viewer = *new* MySimpleViewer;
........
_viewer->setSceneData(_root);
_viewer->setCameraManipulator(*new* osgGA::TrackballManipulator);
...........
static int firstFrame=0;
*if* (!firstFrame){
_viewer->init();
firstFrame++;}
_viewer->frameAdvance();
_viewer->frameEventTraversal();
_viewer->getSceneView()-> setProjectionMatrixAsOrtho (-5.0, 5.0, -5.0,
5.0, -5.0, 5.0); // the projection matrix
_viewer->frameUpdateTraversal();
_viewer->frameCullTraversal();
_viewer->frameDrawTraversal();
With this code the loaded model react to the trackball properly : when I
rotate it, it rotates around himself.
Second test using the same code with, in addition, a setting of the
modelview matrix to the identity :
viewer = *new* MySimpleViewer;
........
_viewer->setSceneData(_root);
_viewer->setCameraManipulator(*new* osgGA::TrackballManipulator);
...........
static int firstFrame=0;
*if* (!firstFrame){
_viewer->init();
_viewer->getCameraManipulator()->setByMatrix(osg::Matrixd::identity()
); // the modelview matrix
firstFrame++;}
_viewer->frameAdvance();
_viewer->frameEventTraversal();
_viewer->getSceneView()-> setProjectionMatrixAsOrtho (-5.0, 5.0, -5.0,
5.0, -5.0, 5.0); // the projection matrix
_viewer->frameUpdateTraversal();
_viewer->frameCullTraversal();
_viewer->frameDrawTraversal();
With this code the loaded model do not react properly to the trackball :
when I rotate it, it rotate around a "virtual sphere (the trackball ?)"
and not around himself as expected (and as it rotated without the
setting of the modelview matrix with the first piece of code). Why ? I
set a modelview matrix to the identity... Does the setting of the
modelview matrix as I set it in my code affect the behavior of the
trackball?
This could help me to understand how works exactly the trackball
manipulator and may help me to resolve my problem.
Thank you.
Fred.
Robert Osfield wrote:
Hi Fredric,
Could it be that the OSG's being row major rather than column major is
the problem? Try transposing your matrix values before passing to the
OSG. OpenGL docs and spec are set out in column major, although the
memory is laid in row major...
Robert.
On 12/12/06, Frédéric SPEISSER <[EMAIL PROTECTED]> wrote:
Robert Osfield wrote:
> Hi Federic,
>
> On 12/12/06, Frédéric SPEISSER <[EMAIL PROTECTED]> wrote:
>> Hi Robert,
>> First of all, thank for your response.
>>
>>
>> I use a matrix described as : m11 m12 m13 m14 which is a perspective
>> matrix, it's true,
>> m21 m22 m23 m24
>> m31 m32 m33 m34
>> 0 0
0 1
>> but it is not described with the openGL usual variables (left ,right,
>> bottom, top, near, far).
>> Indeed, does manipulator (especially trackball) behave properly
when the
>> projection matrix is set through a matrix directly (like above ,
and not
>> set through
>>
>> "setProjectionMatrixAsOrtho" or "setProjectionMatrixAsFrustum" ?
>>
>> And when I set the projection like this, is it normal that in
rotation
>> manipulation the object does not rotate properly (the camera
around the
>> object actually since we're using a camera manipulator) ? Am I
making
>> an incorrect use of the TrackBall ?
>
> OK I'm still lost. The OSG will support you setting your own
> projection matrix without the nedd to use setProjectionMatrixAsOthro
> or setProjectionMatrixAsFrustum. However, the projection matrix
> should just contain the projection, it shouldn't contain parts of the
> view matrix, i.e. rotation etc. Is that you are accumulating a bit of
> what should be a view matrix into the projection matrix?
>
> Robert.
> _______________________________________________
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> http://www.openscenegraph.org/
Ok, excuse me if I'm not very clear.
I'm not accumulating (I hope not, I will make further tests) view and
projection matrix in one matrix since I'm breaking up the "projection"
matrix I use into two matrix :
One, in correspondence to the intrinsic parameters of the camera : a
projection matrix described as follow :
u 0 u0 0
0 v v0 0
0 0 1 0
0 0 0 1
that I set through
_viewer->getSceneView()->setProjectionMatrix(intrinsicMat); _viewer is
an instance of osgViewer::SimpleViewer.
The other, in correspondence to the extrinsic parameters of the camera :
a modelview matrix described as follow :
r11 r12 r13 tx
r21 r22 r23 ty
r31 r32 r33 tz
0 0 0 1
that I set through
_viewer->getCameraManipulator()->setByMatrix(extrinsicMat); _viewer is
an instance of osgViewer::SimpleViewer.
I keep testing...
Thank you,
Fred.
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