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 Free-flying camera Y axis movement too fast, is tangent vector calc wrong?  (Read 565 times) 0 Members and 1 Guest are viewing this topic.
pixelprime

Junior Devvie

Medals: 3

 « Posted 2013-02-20 10:33:23 »

Hi All,

I've written a camera class to handle FPS-style movement throughout the game world, but for some reason I don't seem to be traveling the correct distance along the Y axis when pointing in that direction. Here's the code that handles the calculation of 'moving forward' along the current vector:

 1  2  3  4  5  6  7  8  9  10 `protected void moveForward(float distance)   {      // track value (for debugging)      lastMoveForward = distance;            speedX -= (distance * (float)Math.sin(Math.toRadians(yaw)));      speedZ += (distance * (float)Math.cos(Math.toRadians(yaw)));              if (flyMode) { speedY += distance * (float) Math.tan(Math.toRadians(pitch)); }   }`

Some quick code notes:
yaw: a value between 0-359
pitch: a value clamped between -80 (looking down) and 80 (looking up)
speedX/Y/Z: values that are added to the camera's X, Y and Z positions respectively, then zeroed-out ready for the next tick.

Moving along the X and Z axes (when looking along those axes) works beautifully. The distance travelled is ~4 units per second.

However, when flyMode is switched on (for a free-flying camera), and looking up or down, the distance travelled is vastly different - more like 20-30 units per second.

Am I calculating the speed increment along the Y axis totally wrong? Or maybe a combination of them all?

Many thanks for any help anyone can offer. I'm already learning how tremendously resourceful this community can be : )
DazKins
 « Reply #1 - Posted 2013-02-20 12:23:12 »

You should not be using Math.tan() to calculate the new y value, You should be using Math.sin

DazKins

Check out my Dev Blog: http://dazkins.tumblr.com
pixelprime

Junior Devvie

Medals: 3

 « Reply #2 - Posted 2013-02-20 13:10:40 »

That's perfect! Thanks for your help!
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