starlord
Jr. Member  Posts: 63
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on:
2003-06-21 11:09:41 » |
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how can i convert my window position(mouse pos from mouse event) to my "world" position.
i googled an example using gluUnProject but it doesn't return "good" values.
so what i need is to convert my current mouse pos to scene pos so i can cast a ray to pick object under my mouse.
any pointer's to tutorial or example code would be helpfull.
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Orangy Tang
JGO Kernel Posts: 2960 Medals: 37
Monkey for a head
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Reply #1 on:
2003-06-21 11:15:41 » |
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Saying it doesn't return good values doesn't help much - wrong values how? You should be able to project two points and create a ray from them.
Otherwise, try using gluProject as a debugging aid to see what values you should be providing to gluUnProject..
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starlord
Jr. Member Posts: 63
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Reply #2 on:
2003-06-21 11:28:58 » |
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doesn't return "good" value mean's that it alway's return's
x:0.0
y:0.0
z:0.0
sorry for not mention it.
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Games published by our own members! Go get 'em! 
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Orangy Tang
JGO Kernel Posts: 2960 Medals: 37
Monkey for a head
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Reply #3 on:
2003-06-21 12:15:00 » |
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That sounds mighty odd - are you sure your matricies are setup correctly? And that you're retreiving your values correctly? Hows about posting the code? My telepathy isn't working today  |
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starlord
Jr. Member Posts: 63
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Reply #4 on:
2003-06-21 13:33:28 » |
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| float camx = posV.x;
float camy = posV.y;
float camz = posV.z;
int viewport[] = new int[4];
double modelMatrix[] = new double[16];
double projMatrix[]=new double[16];
double rRay[]=new double[3];
gl.glGetIntegerv(GL.GL_VIEWPORT, viewport);
gl.glGetDoublev(GL.GL_MODELVIEW_MATRIX, modelMatrix);
gl.glGetDoublev(GL.GL_PROJECTION_MATRIX, projMatrix);
glu.gluUnProject(
x, y, 1.0, modelMatrix,
projMatrix,
viewport,
rRay,
rRay,
rRay); |
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abies
Sr. Member Posts: 456
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Reply #5 on:
2003-06-21 14:12:36 » |
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One thing which is wrong for sure is triple rRay at the end. You should pass 3 single-element arrays instead of passing single 3-element array three times.
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Artur Biesiadowski
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Orangy Tang
JGO Kernel Posts: 2960 Medals: 37
Monkey for a head
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Reply #6 on:
2003-06-21 14:38:23 » |
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Aye, try changing it to this: 1
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| glu.gluUnProject(
x, y, 1.0, modelMatrix,
projMatrix,
viewport,
rRay,
rRay+4,
rRay+8); |
The z value is going to be app dependant, but you can typically chose two arbitrary values such as 1 and 10 and use the two points to construct your ray. Edit: Oops, Jogl code, not lwjgl  So you'll need to make fresh arrays for the extras, not use a pointer offset. |
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starlord
Jr. Member Posts: 63
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Reply #7 on:
2003-06-22 00:22:15 » |
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so the last line becomes: 1
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| glu.gluUnProject(
x, y, 1.0, modelMatrix,
projMatrix,
viewport,
rRay_x,
rRay_y,
rRay_z); |
right? with rRay_x,y,z being array of size 3. why's that? i'm used to have command like this(c): 1
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| gluUnProject ((GLfloat)x,(GLfloat)y, 1.0, modelMatrix,
projMatrix, viewport, &rRay[0], rRay[1], &rRay[2]); |
so this is becose of pointers? anything else in jogl has this kind of tricks? |
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starlord
Jr. Member Posts: 63
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Reply #8 on:
2003-06-22 00:46:40 » |
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but it still return's values 0.0,0.0,0.0
and gluUnProject return's GL_FALSE
so that's the reason for returning zero's.
but why it can't project?
i'm calling this method every time mouse has been clicked
on canvas
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starlord
Jr. Member Posts: 63
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Reply #9 on:
2003-06-22 00:57:37 » |
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and when i check error's with glError after gluUnProject
it give's invalid operation.
and when i put DebugGL to canvas it complain's about every gl.glEnd();
and when i remove them it work's but when i click on canvas
so that it call's to method that contains gluUnproject
it give's me out of memory exception.
this is bit odd why it give's error from glEnd()?
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Games published by our own members! Go get 'em! 
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starlord
Jr. Member Posts: 63
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Reply #10 on:
2003-06-22 01:21:39 » |
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now i know the problem,it isn't gluUnProject that is failing, it's glGetDoublev and glGetIntegerv. those return's full of zero's array for GL.GL_MODELVIEW_MATRIX,GL.GL_PROJECTION_MATRIX and GL.GL_VIEWPORT. now i need to know why those fail's and how to fix this.  |
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cfmdobbie
JGO Wizard Posts: 1257
Who, me?
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Reply #11 on:
2003-06-22 02:51:49 » |
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Post your code for them then |
Hellomynameis Charlie Dobbie.
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starlord
Jr. Member Posts: 63
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Reply #12 on:
2003-06-22 04:17:12 » |
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| double model_view[] = new double[16];;
double projection[] = new double[16];
int viewport[] = new int[4]; |
and the code to get the values 1
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| gl.glGetDoublev(GL.GL_MODELVIEW_MATRIX, model_view);
int glError = gl.glGetError();
gl.glGetDoublev(GL.GL_PROJECTION_MATRIX, projection);
glError = gl.glGetError();
gl.glGetIntegerv(GL.GL_VIEWPORT, viewport);
glError = gl.glGetError(); |
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Orangy Tang
JGO Kernel Posts: 2960 Medals: 37
Monkey for a head
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Reply #13 on:
2003-06-22 05:00:28 » |
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i'm calling this method every time mouse has been clicked
on canvas
I tried the glGet calls exactly as you had them written, and they worked fine - then I noticed you said this. Odds are you're calling glGet from a different thread that the GL context is currently active in. There is a way to change this (i noticed it in the Animator source) but you'll probably have nasty race conditions if you start tinkering with that. My advice would be to set a flag to indicate that your GL thread should project the point, and possibly do the work there, then you avoid most of these issues. |
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starlord
Jr. Member Posts: 63
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Reply #14 on:
2003-06-22 05:46:48 » |
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thanks,that was the problem.
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