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nick5454

controlling an object with vectors

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Okay so I have developed an object(airplane) but that doesnt matter. I record the x,y,z and its velocities the create vectors from that. I have to calculate the new x,y,z positions. I was thinking is it better to actual translate a vectore apply a movement vector to it, then grab the result x,y, and z? Which is the best(politically correct) way? thanks, nick

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Are you talking about translating a vector by a certain velocity vector? If so, it''s a little more complicated (but not very) than adding them together. Just run your velocity vector through D3DXTransformNormal(), and then add it to your position vector. Like this:
// posVec is the position vector
// velVec is the velocity vector
// matOrientation is the orientation matrix / inverse view matrix
D3DXVec3TransformNormal( &velVec, &velVec, &matOrientationn );
posVec += velVec;
To see an implementation of this, look at the UpdateCamera() function in the Cull sample.


Dustin Franklin
Mircrosoft DirectX MVP

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