Hi all, how can i move an object that i''ve just rotated to head in that particular direction ? my object is rotating from 0 to 6.28 rad ( 0 to 360 deg ). i''m not looking for a matrix operation, just the x = x * ? + ... any help on how to proceed would be much appreciated. Thanks, Sash

I''m not too sure how you are implementing your algo.
But maybe you could use the equation for a circle to
extrapolate your directional vectors.

Say your object is facing 0 theta.

3PI/2
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PI --------->---------- 0, 2PI
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PI/2
Ok, cos( 0 ) = 1, sin( 0) = 0

So if you use, x_pos += cos( theta ) and
y_pos += sin( theta )
You are moving in the direction you are facing.

Now say, you rotated to the 3PI/2 direction.

cos( 3PI/2 ) = 0, sin( 3PI/2 ) = -1
x_pos += cos( 3PI/2 ), y_pos += sin( 3PI/2 )

So, your moving in the direction you rotated.
To change you velocity, you might use a magnitude
in the equation so you can move at a given speed.

ex. x_pos += cos( theta ) * magnitude
y_pos += sin( theta ) * magnitude

This should work for 2d, 3d is a little more difficult.

Happy Programming, GUY

Hi Guy,

Thanks for the help, that''s exactly what i was looking for !

Best regards,

Sash