Another 3D camera question.

[willmotil]

Use the cameras world matrix up down right or left vectors and add them to the cameras position then pass that back into your CreateWorld function to move the camera properly on the cameras local axis.
Opposed to the system coordinate axis.

cameraWorld.Translation = cameraWorld.Translation + cameraWorld.Left;

Example.

// So here we initially defined position and point a camera object in the world for the first time..
Matrix cameraWorld = Matrix.CreateWorld(new Vector3(0,1f,0), new Vector3(.707f, 0, .707f), Vector3.Up);

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// When updating we want to move the camera on its own local axis, for example here to the left.
cameraWorld = Matrix.CreateWorld(cameraWorld.Translation + cameraWorld.Left * distance , cameraWorld.Forward, Vector3.Up);
// distance here is how much the camera is moved as the matrix left right up or down is unit length.

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// If you allow the ability to roll your camera then instead of the above use the cameras up.
cameraWorld = Matrix.CreateWorld(cameraWorld.Translation + cameraWorld.Left * distance, cameraWorld.Forward, cameraWorld.Up);

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Create the view matrix with CreateLookAt from that camera matrix.
.

view = Matrix.CreateLookAt(cameraWorld.Translation, cameraWorld.Translation + cameraWorld.Forward, cameraWorld.Up);

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Similar to what was previously stated in the reply in the last post.

3D camera position and LookAt?

Hi there. Before I set off on another completely uncharted journey, I thought I’d ask… If in a 3D game I’ve decided all the scenery is going to remain in the same position and I’m going to move the camera around, do I need to use the CreateLookAt and create an imaginary point on a sphere around ‘me’ in space to LookAt? If that’s the case can I simply use a projection or normalised copy of my rotation vector? Many thanks.

There are some things to know about the CreateWorld up parameter passed as well as how to prevent gimble lock but i don’t think you are quite there yet.