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# Horizontal Velocity for First Person Shooter

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hi, i have tried to incorporate a horizontal velocity in my movement code, where i use only one value for both x and z: the problem is that the acceleration and decceleration is not working constant, sometimes it is faster, then slower, or even there is no velocity at all or i must turn around the axis so it will work again.... the source code is as follows:
  if (move) // player is moving or strafing velocity += 0.002 * 32; else velocity -= 0.002 * 32; if (velocity > 1.0) velocity = 1.0; if (velocity < 0.0) velocity = 0.0; // x delta and z_delta are already computed according to // y and x axis of mouse look // finally the velocity is applied: x_delta *= velocity; z_delta *= velocity; // set camera camera[0] += x_delta; camera[2] += z_delta; 

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Hmm. What FPS are you running? If you call this once a frame, you''ll be at full velocity in 16 frames. If you''re running at, say, 75 fps, that''s zero to full speed in 2 tenths of a second. Shouldn''t you be multiplying by a time delta somwhere in there?

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thankx, but x_delta and z_delta are multiplied by the time delta between each frame, this should be right i think?

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quote:
Original post by Gammastrahler
thankx, but x_delta and z_delta are multiplied by the time delta between each frame, this should be right i think?

Nope. You''re correcting your velocity for time, but not your acceleration. You need to use the time delta in your velocity += and -= lines.

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