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Simplifying camera rotations

Started by Axiverse Apr 17, 2004 at 1:07 PM 3 replies 450+ views

Original Post

132

Apr 17, 2004 at 1:07 PM

I''m trying to make a camera based on the following values First Distance from the target then Angle of attack or degrees off the y axis (rotate alone the X) then rotation around the Z axis then Roll on the current axis And lastly translate to the target. My question is can you simplify those rotations into one angle axis rotation instead of 3 for every time the camera moves??

Samith

305

Samith

Apr 17, 2004 at 1:30 PM

You might want to look into quaternions, although those might just complicate things a bit.

JohnBolton

132

JohnBolton

Apr 18, 2004 at 11:29 PM

Since each of those can be separately represented by a 4x4 matrix, you can create a matrix for each and multiply them all together to get a single matrix. Any time the location and/or orientation of the camera changes, recompute the combined matrix.

SoulSpectre

Apr 18, 2004 at 11:40 PM

You will problably be able to collapse down 2 or so of the matrices if you have a good look. The more transformations there are and the more variables, the harder it will be to collapse as the variables will spread through out the matrix.

The effect on performance for this will be negligable since it is your camera and you only have one normally in your scene then this code will only be called once per frame.

davedx

Apr 20, 2004 at 4:56 PM

Quaternions are good. Google ''f00quat'' I think it''s called.

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