camera

That would mean that if I translate let''s say -0.5f the camera would move in the opposite direction?!?

Pretty much... consider that moving by, say, 1 meter, eastward is the same as you staying where you are and moving the rest of the universe westward. Camera matrix is the transformation applied to the rest of the universe not to the camera itself, so everything *is* going backward there.

OD

Oh, I see.

So I have to transform my camera and use it''s matrix to transform every vertex in my whole world?!?

Yes. you should invert the cameras rotation matrix and the translation vector, then apply that transform to everything in your world. You don''t have to do the inversion but if you don''t then when you tell your camera to move forward you are telling your world to move forward i.e. your camera is moving backwards. This would get confusing (in fact, I think it already has).



Geocyte Has Committed Suicide.

Ok, thanks Geocyte...

But there''s one point left:

Does my camera (and the view) always stay at (0,0,0)?

This is what I do now:
translate and rotate camera
translate and rotate world
multiply inverse camera view matrix with every vertex in world
draw with view from camera view matrix

Is this right?

I have also a question regarding Mr. Anonymous'' answer:

The camera always stays at (0,0,0). But is camerspace != worldspace then?

I can''t see the difference between them!?!

Sorry George for using your thread...

Maybe it''s best to imagine this situation like a tree:

- center of world (root node) (world space)
--- camera (camera space)
--- house (object space)
----- door (object space)


If you''re displaying from the camera, the camera is your origin.
To display the house, you first need to move back from camera to center of world. Now you''re in world space.
Then you move from this center to the house. You''re now in object space, and can draw your object.

To move up a node - multiply matrices.
To move down a node - multiply with inverse matrix.

Ok, baskuenen I think I got it... I hope so!?!

Thx

George,

You should read the article I wrote on this subject at http://www.makegames.com/3Drotation. I drew pictures and even worked a problem. There''s some source code there too. Maybe it will help.

Good luck,

Diana

I already saw your tutorial at mr-gamemaker...

But it doesn''t show how to exactly render the world... You only set the viewing matrix with the camera matrix?!?
It isn''t shown how you can rotate the world around the camera
(this is what I understood I have to do...)

Sorry for bad English... But I''m drunken