Right And Up Vectors for Camera.
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What are the equations for camera pan up, down, left and right? I want to move the Eye and Lookat at the same time for the Camera pan, so I believe I need to use the Right (1.0, 0.0,0.0) and Up (0.0,1.0,0.0) vectors do so.
Anyone have any ideas on what I should do?
(Where m_position is the Eye and m_lookat is the LookAt.)
1)Here is what I am doing for doing the camera PAN up:
m_lookat+=(m_lookat*distance);
m_position+=(m_up*distance);
2) This code is for doing camera PAN to the right:
m_lookat-=(m_lookat*distance);
m_position-=(m_right*distance);
Thanks for the help in advance.
Oh, boy. Camera stuff. I''ll bet you''re discovering just how much fun it can be , and you ain''t seen nothing yet.
OK. As far as I can tell, you''re using a m_Position vector for the position of your camera in real space and an m_LookAt vector for... What? Basically, there are two possibilities, and you seem to have confused them.
(1) m_LookAt is an actual vector (describing a direction, like m_Up or m_Right) that points away from m_Position in the direction of your focus point. If this is the case, this vector won''t need to be changed - the direction will stay the same as long as you''re panning and not rotating.
(2) m_LookAt is your actual focus point. If this is the case, you will just do the same thing to m_LookAt as you do to m_Position; that is, m_LookAt += (m_Up * distance) for panning up-and-down, and m_LookAt += (m_Right * distance) for panning side-to-side.
That''s half of your problem. Hang on tight for the second part...
You''ll still want the += operator for moving to the right. Again, as in the case of the m_LookAt vector (assuming possibility #2 above is true), you''ll need to multiply the distance by the m_Right vector, not the m_LookAt. I''m not sure what you''re trying to do, adding a positional vector to itself...
That should do it. By the way, you might want to try the math and physics forum, or the game programming forum - this doesn''t seem to be a very DirectX-specific problem. Still, hope I helped.
- TythosEternal
"Who''s John Galt?"
OK. As far as I can tell, you''re using a m_Position vector for the position of your camera in real space and an m_LookAt vector for... What? Basically, there are two possibilities, and you seem to have confused them.
(1) m_LookAt is an actual vector (describing a direction, like m_Up or m_Right) that points away from m_Position in the direction of your focus point. If this is the case, this vector won''t need to be changed - the direction will stay the same as long as you''re panning and not rotating.
(2) m_LookAt is your actual focus point. If this is the case, you will just do the same thing to m_LookAt as you do to m_Position; that is, m_LookAt += (m_Up * distance) for panning up-and-down, and m_LookAt += (m_Right * distance) for panning side-to-side.
That''s half of your problem. Hang on tight for the second part...
You''ll still want the += operator for moving to the right. Again, as in the case of the m_LookAt vector (assuming possibility #2 above is true), you''ll need to multiply the distance by the m_Right vector, not the m_LookAt. I''m not sure what you''re trying to do, adding a positional vector to itself...
That should do it. By the way, you might want to try the math and physics forum, or the game programming forum - this doesn''t seem to be a very DirectX-specific problem. Still, hope I helped.
- TythosEternal
"Who''s John Galt?"
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