Im stuck with glTranslatef()
Author
Im using glTranslatef function to move some object (md2) somewhere into the space, for example 0,0,0.
Next im setting up a camera look gluLookAt() on those coordinates. After this i have implemented the keys moving camera, and here is the problem. When i move my camera for example forward, the object moves also ! why?? please help...
how to set something in his place, maybe there is other function than translatef...?
Use gluLookup before you translate your object. Your camera transform should always be the first thing you do.
____________________________________________________________
www.elf-stone.com
____________________________________________________________
www.elf-stone.com
there is no glLookup, it''s glLookAt()
try this:
glLookAt(whatever);
glPushMatrix();
glLoadIdentity();
glTranslatef(whatever the object coord);
DrawObject();
glPopMatrix();
see if that works
try this:
glLookAt(whatever);
glPushMatrix();
glLoadIdentity();
glTranslatef(whatever the object coord);
DrawObject();
glPopMatrix();
see if that works
there is no glLookup, it''s glLookAt()
try this:
glLookAt(whatever);
glPushMatrix();
glLoadIdentity();
glTranslatef(whatever the object coord);
DrawObject();
glPopMatrix();
see if that works
try this:
glLookAt(whatever);
glPushMatrix();
glLoadIdentity();
glTranslatef(whatever the object coord);
DrawObject();
glPopMatrix();
see if that works
Author
damn, now the object dissapeared somewhere in the "space". look this is my code for this:
inline int DrawGLScene(GLvoid){
glClear(GL_DEPTH_BUFFER_BIT | GL_COLOR_BUFFER_BIT); glLoadIdentity(); gluLookAt(-20,40,-60,
-20,0,20,
-20,0,20);
// below, we''v got a map
glDisable(GL_BLEND);
glDisable(GL_LIGHTING);
glEnable(GL_TEXTURE_2D);
glBindTexture(GL_TEXTURE_2D, texture[1]);
glBegin(GL_QUADS);
glTexCoord2f(1.0f, 1.0f); glVertex3f(-1.0f, -2.0f, 0.0f);
glTexCoord2f(0.0f, 1.0f); glVertex3f( 40.0f, -2.0f, 0.0f);
glTexCoord2f(0.0f, 0.0f); glVertex3f( 40.0f, -2.0f, 40.0f);
glTexCoord2f(1.0f, 0.0f); glVertex3f(-1.0f, -2.0f, 40.0f);
glEnd();
//and here we''v got a model
glPushMatrix();
glLoadIdentity();
glTranslatef(UP,1,5);
glShadeModel(GL_SMOOTH);
glEnable(GL_TEXTURE_2D);
glBindTexture(GL_TEXTURE_2D, Md2_Texture_Modele.ID);
Md2_Modele.Animate(Md2_Modele.stateStart, Md2_Modele.stateEnd, .2f,20);
glPopMatrix();
and what''s goin'' wrong?
inline int DrawGLScene(GLvoid){
glClear(GL_DEPTH_BUFFER_BIT | GL_COLOR_BUFFER_BIT); glLoadIdentity(); gluLookAt(-20,40,-60,
-20,0,20,
-20,0,20);
// below, we''v got a map
glDisable(GL_BLEND);
glDisable(GL_LIGHTING);
glEnable(GL_TEXTURE_2D);
glBindTexture(GL_TEXTURE_2D, texture[1]);
glBegin(GL_QUADS);
glTexCoord2f(1.0f, 1.0f); glVertex3f(-1.0f, -2.0f, 0.0f);
glTexCoord2f(0.0f, 1.0f); glVertex3f( 40.0f, -2.0f, 0.0f);
glTexCoord2f(0.0f, 0.0f); glVertex3f( 40.0f, -2.0f, 40.0f);
glTexCoord2f(1.0f, 0.0f); glVertex3f(-1.0f, -2.0f, 40.0f);
glEnd();
//and here we''v got a model
glPushMatrix();
glLoadIdentity();
glTranslatef(UP,1,5);
glShadeModel(GL_SMOOTH);
glEnable(GL_TEXTURE_2D);
glBindTexture(GL_TEXTURE_2D, Md2_Texture_Modele.ID);
Md2_Modele.Animate(Md2_Modele.stateStart, Md2_Modele.stateEnd, .2f,20);
glPopMatrix();
and what''s goin'' wrong?
quote:
there is no glLookup, it's glLookAt()
That's what I meant. For some reason I wrote gluLookup instead. Must be something about posting while half asleep.
DJ_GL's suggestion is completely wrong BTW.
quote:
glLookAt(whatever);
glPushMatrix();
glLoadIdentity();
glTranslatef(whatever the object coord);
DrawObject();
glPopMatrix();
The glLoadIdentity call would clear the camera transform before you draw the object.
The correct order is:
glLoadIdentity(); //clear the modelview matrixglLookAt(whatever); //do the camera transformglPushMatrix(); //store the camera transformglTranslatef(whatever the object coord); //transform the object (multiply the camera transform by the object's transform)DrawObject(); glPopMatrix(); //pop the matrix stack back to the camera transform ____________________________________________________________
www.elf-stone.com
[edited by - benjamin bunny on August 11, 2002 2:23:30 PM]
yea, sorry about that, take out the glLoadIdentity(). hehe, it's from a habit of writing. 
BTW, i wasn't completely wrong obviously if some of it was right. NEways, hehe, after work I stayed up til 9am and so I was really tired when writing that. I just got my 3D selection program selecting correctly using gluProject and gluUnProect.
(not that i need to show this any). it's all win32 coding so it's not any fancy MFC code (as I hate MFC code) and I'm so glad I get the correct 2D to 3D coordinates.
really beautiful now tho...
[edited by - DJ_GL on August 11, 2002 6:06:53 PM]
BTW, i wasn't completely wrong obviously if some of it was right. NEways, hehe, after work I stayed up til 9am and so I was really tired when writing that. I just got my 3D selection program selecting correctly using gluProject and gluUnProect.(not that i need to show this any). it's all win32 coding so it's not any fancy MFC code (as I hate MFC code) and I'm so glad I get the correct 2D to 3D coordinates.
really beautiful now tho...
[edited by - DJ_GL on August 11, 2002 6:06:53 PM]
Yeah sorry, you weren''t completely wrong. BTW, the glLoadIdentity call is still needed, it should just be before the gluLookAt().
Author
What will happen if i call gluLoadIdentity() before every movement of some object like:
gluLoadIdentity();
glTranslatef(...);
some_object_here();
gluLoadIdentity();
glTranslatef(...);
some_object_here2();
? Will it work, or the gluLoadIdentity(); should be called once ?
gluLoadIdentity();
glTranslatef(...);
some_object_here();
gluLoadIdentity();
glTranslatef(...);
some_object_here2();
? Will it work, or the gluLoadIdentity(); should be called once ?
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