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Confusion with PMVMatrix

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john bauer

Confusion with PMVMatrix

I am trying to use the PMVMatrix project and unproject functions and I think that I am using them wrong.

I have

PMVMatrix m = new PMVMatrix();
System.out.println("MATRIX - Identity");
System.out.println(m);

// Simple 10 x 10 view port
int[] viewport = new int[] { 0,0,10,10};

float[] win = new float[4];

m.gluProject(1f, 0f, 0f, viewport, 0, win, 0);
System.out.println("Project 1,0 -->" + Arrays.toString(win));

m.gluProject(0f, 0f, 0f, viewport, 0, win, 0);
System.out.println("Project 0,0 -->" + Arrays.toString(win));

m.glMatrixMode(GL_PROJECTION);
m.glOrthof(0, 10, 0, 10, 1, -1);
System.out.println("MATRIX - Ortho 0,0,10,10 - Locate the origin in the bottom left and scale");
System.out.println(m);

m.gluProject(1f, 0f, 0f, viewport, 0, win, 0);
System.out.println("Project 1,0 -->" +Arrays.toString(win));

m.gluProject(0f, 0f, 0f, viewport, 0, win, 0);
System.out.println("Project 0,0 -->" +Arrays.toString(win));

System.out.println();
System.out.println("Don't trust the implementation");
		
float[] projMatrix = new float[16];
m.glGetFloatv(GL_PROJECTION, projMatrix, 0);
System.out.println("Projection");
for (int i=0; i<4;i++) System.out.println(projMatrix[i] + "\t" +projMatrix[i+1] + "\t" +projMatrix[i+2] + "\t" +projMatrix[i+3] );


float[] modelMatrix = new float[16];
m.glGetFloatv(GL_MODELVIEW, modelMatrix, 0);
System.out.println("Modelview");
for (int i=0; i<4;i++) System.out.println(modelMatrix[i] + "\t" +modelMatrix[i+1] + "\t" +modelMatrix[i+2] + "\t" +modelMatrix[i+3] );


new ProjectFloat(true).gluProject(1f, 0f, 0f,modelMatrix, 0, 
		projMatrix, 0, viewport, 0, win, 0);
System.out.println("Project 1,0 -->" +Arrays.toString(win));

new ProjectFloat(true).gluProject(0f, 0f, 0f,modelMatrix, 0, 
		projMatrix, 0, viewport, 0, win, 0);
System.out.println("Project 0,0 -->" +Arrays.toString(win));

And when I run it I get

PMVMatrix[backingArray true, modified[P true, Mv true, T true], dirty/req[Mvi true/false, Mvit true/false], Projection
[    1.00000    0.00000    0.00000    0.00000 ]
[    0.00000    1.00000    0.00000    0.00000 ]
[    0.00000    0.00000    1.00000    0.00000 ]
[    0.00000    0.00000    0.00000    1.00000 ]
, Modelview
[    1.00000    0.00000    0.00000    0.00000 ]
[    0.00000    1.00000    0.00000    0.00000 ]
[    0.00000    0.00000    1.00000    0.00000 ]
[    0.00000    0.00000    0.00000    1.00000 ]
, Texture
[    1.00000    0.00000    0.00000    0.00000 ]
[    0.00000    1.00000    0.00000    0.00000 ]
[    0.00000    0.00000    1.00000    0.00000 ]
[    0.00000    0.00000    0.00000    1.00000 ]
]
Project 1,0 -->[10.0, 5.0, 0.5, 0.0]
Project 0,0 -->[5.0, 5.0, 0.5, 0.0]
MATRIX - Ortho 0,0,10,10 - Locate the origin in the bottom left and scale
PMVMatrix[backingArray true, modified[P true, Mv true, T true], dirty/req[Mvi true/false, Mvit true/false], Projection
[    0.20000    0.00000    0.00000   -1.00000 ]
[    0.00000    0.20000    0.00000   -1.00000 ]
[    0.00000    0.00000    1.00000    0.00000 ]
[    0.00000    0.00000    0.00000    1.00000 ]
, Modelview
[    1.00000    0.00000    0.00000    0.00000 ]
[    0.00000    1.00000    0.00000    0.00000 ]
[    0.00000    0.00000    1.00000    0.00000 ]
[    0.00000    0.00000    0.00000    1.00000 ]
, Texture
[    1.00000    0.00000    0.00000    0.00000 ]
[    0.00000    1.00000    0.00000    0.00000 ]
[    0.00000    0.00000    1.00000    0.00000 ]
[    0.00000    0.00000    0.00000    1.00000 ]
]
Project 1,0 -->[10.0, 5.0, 0.5, 0.0]
Project 0,0 -->[5.0, 5.0, 0.5, 0.0]

Don't trust the implementation
Projection
0.2	0.0	0.0	0.0
0.0	0.0	0.0	0.0
0.0	0.0	0.0	0.2
0.0	0.0	0.2	0.0
Modelview
1.0	0.0	0.0	0.0
0.0	0.0	0.0	0.0
0.0	0.0	0.0	1.0
0.0	0.0	1.0	0.0
Project 1,0 -->[0.99999994, 0.0, 0.5, 0.0]
Project 0,0 -->[0.0, 0.0, 0.5, 0.0]

I am not getting what I expect after I apply the glOrtho in the PMVMatrix (the anwser is not changing) and when I compare it to the result of FloatProject I get different anwsers. The FloatProject Anwser looks correct. I think that I have tracked this down to the PMVMatrix gluProject function on the lines that have matrixMv.array(), and
matrixP.array(). They seem to be getting the wrong data from the array

Can you tell me if I am using these functions incorrectly and if so how they are expected to be used. For now I am using the FloatProject work around.

Sven Gothel

Re: Confusion with PMVMatrix

Administrator

On 06/05/2013 07:28 PM, john bauer [via jogamp] wrote:
> I am trying to use the PMVMatrix project and unproject functions and I think
> that I am using them wrong.

.. before digging into details,
which JOGL version do you use ?
Pls test w/ latest aggregated build -> wiki.

This reminds me of an old bug, which we have fixed a while ago.

~Sven

>
> I have
>
> PMVMatrix m = new PMVMatrix();
> System.out.println("MATRIX - Identity");
> System.out.println(m);
>
> // Simple 10 x 10 view port
> int[] viewport = new int[] { 0,0,10,10};
>
> float[] win = new float[4];
>
> m.gluProject(1f, 0f, 0f, viewport, 0, win, 0);
> System.out.println("Project 1,0 -->" + Arrays.toString(win));
>
> m.gluProject(0f, 0f, 0f, viewport, 0, win, 0);
> System.out.println("Project 0,0 -->" + Arrays.toString(win));
>
> m.glMatrixMode(GL_PROJECTION);
> m.glOrthof(0, 10, 0, 10, 1, -1);
> System.out.println("MATRIX - Ortho 0,0,10,10 - Locate the origin in the bottom left and scale");
> System.out.println(m);
>
> m.gluProject(1f, 0f, 0f, viewport, 0, win, 0);
> System.out.println("Project 1,0 -->" +Arrays.toString(win));
>
> m.gluProject(0f, 0f, 0f, viewport, 0, win, 0);
> System.out.println("Project 0,0 -->" +Arrays.toString(win));
>
> System.out.println();
> System.out.println("Don't trust the implementation");
>
> float[] projMatrix = new float[16];
> m.glGetFloatv(GL_PROJECTION, projMatrix, 0);
> System.out.println("Projection");
> for (int i=0; i<4;i++) System.out.println(projMatrix[i] + "\t" +projMatrix[i+1] + "\t" +projMatrix[i+2] + "\t" +projMatrix[i+3] );
>
>
> float[] modelMatrix = new float[16];
> m.glGetFloatv(GL_MODELVIEW, modelMatrix, 0);
> System.out.println("Modelview");
> for (int i=0; i<4;i++) System.out.println(modelMatrix[i] + "\t" +modelMatrix[i+1] + "\t" +modelMatrix[i+2] + "\t" +modelMatrix[i+3] );
>
>
> new ProjectFloat(true).gluProject(1f, 0f, 0f,modelMatrix, 0,
> projMatrix, 0, viewport, 0, win, 0);
> System.out.println("Project 1,0 -->" +Arrays.toString(win));
>
> new ProjectFloat(true).gluProject(0f, 0f, 0f,modelMatrix, 0,
> projMatrix, 0, viewport, 0, win, 0);
> System.out.println("Project 0,0 -->" +Arrays.toString(win));
>
>
> And when I run it I get
>
> PMVMatrix[backingArray true, modified[P true, Mv true, T true], dirty/req[Mvi true/false, Mvit true/false], Projection
> [ 1.00000 0.00000 0.00000 0.00000 ]
> [ 0.00000 1.00000 0.00000 0.00000 ]
> [ 0.00000 0.00000 1.00000 0.00000 ]
> [ 0.00000 0.00000 0.00000 1.00000 ]
> , Modelview
> [ 1.00000 0.00000 0.00000 0.00000 ]
> [ 0.00000 1.00000 0.00000 0.00000 ]
> [ 0.00000 0.00000 1.00000 0.00000 ]
> [ 0.00000 0.00000 0.00000 1.00000 ]
> , Texture
> [ 1.00000 0.00000 0.00000 0.00000 ]
> [ 0.00000 1.00000 0.00000 0.00000 ]
> [ 0.00000 0.00000 1.00000 0.00000 ]
> [ 0.00000 0.00000 0.00000 1.00000 ]
> ]
> Project 1,0 -->[10.0, 5.0, 0.5, 0.0]
> Project 0,0 -->[5.0, 5.0, 0.5, 0.0]
> MATRIX - Ortho 0,0,10,10 - Locate the origin in the bottom left and scale
> PMVMatrix[backingArray true, modified[P true, Mv true, T true], dirty/req[Mvi true/false, Mvit true/false], Projection
> [ 0.20000 0.00000 0.00000 -1.00000 ]
> [ 0.00000 0.20000 0.00000 -1.00000 ]
> [ 0.00000 0.00000 1.00000 0.00000 ]
> [ 0.00000 0.00000 0.00000 1.00000 ]
> , Modelview
> [ 1.00000 0.00000 0.00000 0.00000 ]
> [ 0.00000 1.00000 0.00000 0.00000 ]
> [ 0.00000 0.00000 1.00000 0.00000 ]
> [ 0.00000 0.00000 0.00000 1.00000 ]
> , Texture
> [ 1.00000 0.00000 0.00000 0.00000 ]
> [ 0.00000 1.00000 0.00000 0.00000 ]
> [ 0.00000 0.00000 1.00000 0.00000 ]
> [ 0.00000 0.00000 0.00000 1.00000 ]
> ]
> Project 1,0 -->[10.0, 5.0, 0.5, 0.0]
> Project 0,0 -->[5.0, 5.0, 0.5, 0.0]
>
> Don't trust the implementation
> Projection
> 0.2 0.0 0.0 0.0
> 0.0 0.0 0.0 0.0
> 0.0 0.0 0.0 0.2
> 0.0 0.0 0.2 0.0
> Modelview
> 1.0 0.0 0.0 0.0
> 0.0 0.0 0.0 0.0
> 0.0 0.0 0.0 1.0
> 0.0 0.0 1.0 0.0
> Project 1,0 -->[0.99999994, 0.0, 0.5, 0.0]
> Project 0,0 -->[0.0, 0.0, 0.5, 0.0]
>
>
> I am not getting what I expect after I apply the glOrtho in the PMVMatrix (the
> anwser is not changing) and when I compare it to the result of FloatProject I
> get different anwsers. The FloatProject Anwser looks correct. I think that I
> have tracked this down to the PMVMatrix gluProject function on the lines that
> have matrixMv.array(), and
> matrixP.array(). They seem to be getting the wrong data from the array
>
> Can you tell me if I am using these functions incorrectly and if so how they
> are expected to be used. For now I am using the FloatProject work around.
>
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john bauer

Re: Confusion with PMVMatrix

Ok, we are just using the latest release. I can try it against the nightly builds.

Sven Gothel

Re: Confusion with PMVMatrix

Administrator

In reply to this post by john bauer

On 06/05/2013 07:28 PM, john bauer [via jogamp] wrote:
> I am trying to use the PMVMatrix project and unproject functions and I think
> that I am using them wrong.
>
> I have
>

Fixed - thx.
<https://jogamp.org/bugzilla/show_bug.cgi?id=748>

Note: Your array print method is wrong.

~Sven

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HRJ

Re: Confusion with PMVMatrix

Does this affect JOGL version 2.1.3? I am seeing some strange results with PMVMatrix.glProject()

Thanks,
HRJ

gouessej

Re: Confusion with PMVMatrix

Administrator

Hi

Your comment is so vague. Please tell us what you do, what the expected result is and what you get. Moreover, use the very latest version (which is currently JOGL 2.1.4).

Julien Gouesse | Personal blog | Website

HRJ

Re: Confusion with PMVMatrix

Before posting my whole test case, I just want to know if the reported bug is known to be present in 2.1.3.

I did try to get 2.1.4 but the jar files are apparently corrupted. For example, this file:
http://jogamp.org/deployment/v2.1.4/jar/jogl-all.jar

.. gives this error:
jar tf jogamp_2.1.4/jogl-all.jar
java.util.zip.ZipException: error in opening zip file
at java.util.zip.ZipFile.open(Native Method)
at java.util.zip.ZipFile.<init>(ZipFile.java:215)
at java.util.zip.ZipFile.<init>(ZipFile.java:145)
at java.util.zip.ZipFile.<init>(ZipFile.java:116)
at sun.tools.jar.Main.list(Main.java:1004)
at sun.tools.jar.Main.run(Main.java:245)
at sun.tools.jar.Main.main(Main.java:1177)

gouessej

Re: Confusion with PMVMatrix

Administrator

This JAR is not corrupted but Mozilla Firefox included a "security" feature affecting JARs several years ago, the content of the JAR is more or less wrapped into a ZIP... which leads to a JAR unusable as is. Rather download the whole archive and extract the JARs from it:
http://jogamp.org/deployment/v2.1.4/archive/jogamp-all-platforms.7z

If you still have the same error, then the JAR is really corrupted. The reported bug was already fixed a long time before JOGL 2.1.3 was released, it should work but maybe you have found another bug.

Julien Gouesse | Personal blog | Website

Irene Tang

Re: Confusion with PMVMatrix

In reply to this post by Sven Gothel

Why is the projection matrix

after m.glMatrixMode(GL_PROJECTION);
m.glOrthof(0, 10, 0, 10, 1, -1); Why the value in the blue circle isn't -1?

elect

Re: Confusion with PMVMatrix

Irene Tang wrote

Why is the projection matrix after m.glMatrixMode(GL_PROJECTION);
m.glOrthof(0, 10, 0, 10, 1, -1); Why the value in the blue circle isn't -1?

public static Mat4 ortho(Mat4 res, float left, float right, float bottom, float top, float zNear, float zFar) {
res.m00 = 2.0f / (right - left);
res.m01 = 0.0f;
res.m02 = 0.0f;
res.m03 = 0.0f;
res.m10 = 0.0f;
res.m11 = 2.0f / (top - bottom);
res.m12 = 0.0f;
res.m13 = 0.0f;
res.m20 = 0.0f;
res.m21 = 0.0f;
res.m22 = -2.0f / (zFar - zNear);
res.m23 = 0.0f;
res.m30 = -(right + left) / (right - left);
res.m31 = -(top + bottom) / (top - bottom);
res.m32 = -(zFar + zNear) / (zFar - zNear);
res.m33 = 1.0f;
return res;
}

that value is m22

m22 = -2.0f / (-1 - 1) = -2.0f / -2 = 1

I strongly suggest you to move away from using deprecated opengl and starting working with the matrices directly by yourself ;)