Rotate object Up/Down/Left/Right in any orientation

Posted by George Duckett on Game Development See other posts from Game Development or by George Duckett
Published on 2012-05-21T13:05:15Z Indexed on 2012/11/12 23:15 UTC
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XNA

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c#

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rotation

I'm rendering model at the origin with a fixed camera looking at it positioned on the z axis.

I want to be able to rotate the model up/down and left/right. Currently I have 2 variables, HorizontalRotation and VerticalRotation. When calculating the world matrix I rotate about the Y axis by HorizontalRotation and about the X axis by VerticalRotation.

The ..Rotation variables are controlled by pressing up/down/left/right arrow keys.

The problem I'm having is that the rotations are happening relative to the object.

Lets say it's a model of the world. Pressing Up a bit would let me look at the north pole.
Currently when i press right the earth spins infront of the camera on its axis; I'm still looking at the north pole.

How can i get it so that no matter what rotations are currently applied i can always rotate my model relative to the camera/world axis?

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