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flying around

Started by NerdAndy Sep 19, 2005 at 5:27 PM 2 replies 750+ views

Original Post

Sep 19, 2005 at 5:27 PM

hi everyone am making a fun game for me. lol and am trying to fly my mesh(a jet) around. i have 1 problem. i wnat to move my mesh in the direction its pointing in after setting the pitch,yaw,roll. am not using real physics. the speed is constant if the user leave the "space" for more the 10sec he will die. note: only need help with the math. thanks

Zakwayda

Sep 19, 2005 at 6:36 PM

All you need to do is extract the direction vectors for the airplane from its orientation matrix. As for how to do that, it depends on what API you're using, if you have your own matrix library, etc. So you might provide some more information.

NerdAndy

Sep 19, 2005 at 9:05 PM

Quote:
Original post by jyk
All you need to do is extract the direction vectors for the airplane from its orientation matrix. As for how to do that, it depends on what API you're using, if you have your own matrix library, etc. So you might provide some more information.

am using C# and Manage DirectX

Zakwayda

Sep 19, 2005 at 9:42 PM

Quote:
am using C# and Manage DirectX

Still don't know enough to say for sure, but the following should work.

Create your airplane orientation matrix, presumably using the DirectX 'yaw, pitch, roll' function. Then extract the basis vectors from the matrix as follows:

Vector3 x(m11, m12, m13);
Vector3 y(m21, m22, m23);
Vector3 z(m31, m32, m33);

Or with 1d indexing:

Vector3 x(m0, m1, m2);
Vector3 y(m4, m5, m6);
Vector3 z(m8, m9, m10);

These will be the side, up, and forward direction vectors for your airplane. Which is which depends on how your model is oriented initially.

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