Evil-Dog

08-16-2001, 11:07 AM

Hi. I'm trying to figure out how to move around my 3d world and also place my object and move them independently of the camera...and also without using gluLookAt

Can anyone help ?

Can anyone help ?

View Full Version : I don't like glRotate and glTranslate hehehe :)

Evil-Dog

08-16-2001, 11:07 AM

Hi. I'm trying to figure out how to move around my 3d world and also place my object and move them independently of the camera...and also without using gluLookAt

Can anyone help ?

Can anyone help ?

Evil-Dog

08-16-2001, 11:13 AM

Precision : If you could enlighten me with how to use glPushMatrix and glPopMatrix and also what is the proper order to draw and transfom( rotate and translate ) object in the 3d world I would be pleased !

I need the logic of the camera and the object.

Thanks alot

I need the logic of the camera and the object.

Thanks alot

Michael Steinberg

08-16-2001, 04:13 PM

Move the objects around with the ModelView matrix. glRotate, glTranslate and glScale.

Now your object are placed in the world-coordinate system.

Then put together a matrix that would represent the camera-object (ie. position of the camera negatively). Matrix 1 is the result.

Then get the rotation matrix of the camera. Transpose this matrix (orthogonal transpose = inverse) and the resulting one is Matrix 2.

Take Matrix2 * Matrix1 = Matrix 3.

Multiply Matrix 3 on the objects modelview matrix. There you go.

Now your object are placed in the world-coordinate system.

Then put together a matrix that would represent the camera-object (ie. position of the camera negatively). Matrix 1 is the result.

Then get the rotation matrix of the camera. Transpose this matrix (orthogonal transpose = inverse) and the resulting one is Matrix 2.

Take Matrix2 * Matrix1 = Matrix 3.

Multiply Matrix 3 on the objects modelview matrix. There you go.

zed

08-16-2001, 11:59 PM

if u understand gluLookAt(..) then use it, youll pick up linear algebra with time.

btw carmack used a function called myGluLookAt(..) in quake1 http://www.opengl.org/discussion_boards/ubb/smile.gif

btw carmack used a function called myGluLookAt(..) in quake1 http://www.opengl.org/discussion_boards/ubb/smile.gif

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