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Camera rotation control

Started by MARS_999 Aug 8, 2006 at 1:46 AM 2 replies 400+ views

Original Post

Aug 8, 2006 at 1:46 AM

I am trying to stop my camera from rotating to far up and down and can't get this to work...


if(rotate)
	{
		GetCursorPos(&mousePos);
		unsigned int x = unsigned int(screenwidth * .5f);
		unsigned int y = unsigned int(screenheight * .5f);
		static float lastPitch = 0.0f;
		static float currentPitch = 0.0f;

        SetCursorPos(x, y);
      
		float pitch  = directInput.mouseDY() / ROTATEMOUSE_SPEED;
		float yAngle = directInput.mouseDX() / ROTATEMOUSE_SPEED;

		lastPitch = currentPitch;
		currentPitch += pitch;

		if(currentPitch > pitchRangeMax)
			pitch = pitchRangeMax;
		if(currentPitch < pitchRangeMin)
			pitch = pitchRangeMin;

		D3DXMATRIX R;
		D3DXMatrixRotationAxis(&R, &mRightWS, pitch);
		D3DXVec3TransformCoord(&mLookWS, &mLookWS, &R);
		D3DXVec3TransformCoord(&mUpWS, &mUpWS, &R);

		D3DXMatrixRotationY(&R, yAngle);
		D3DXVec3TransformCoord(&mRightWS, &mRightWS, &R);
		D3DXVec3TransformCoord(&mUpWS, &mUpWS, &R);
		D3DXVec3TransformCoord(&mLookWS, &mLookWS, &R);
	}

Thanks

nini

Aug 8, 2006 at 2:35 AM

i've made this mistake once , in fact if you want to use your pitch variable like you do , you must restart from the initial condition , that's to say :
your camera direction should be vDir0 and not your actual vDir...

// this is false :
D3DXVec3TransformCoord(&mLookWS, &mLookWS, &R);

// this is right :
D3DXVec3TransformCoord(&mLookWS, &mLookWS0, &R);
with mLookWS0 being your initial Direction.

if you want to use mLookWS instead , then you have to treat pitch like a volatile variable and store a TotalPitch variable that you increment:

pitch=something;
do your rotation and TotalPitch+=pitch if TotalPitchpitch=0;

hope this helps...

JohnBolton

Aug 8, 2006 at 2:42 AM

I think you want the code to look like this:

    if(currentPitch + pitch > pitchRangeMax)        pitch = pitchRangeMax - currentPitch;    if(currentPitch + pitch < pitchRangeMin)        pitch = pitchRangeMin - currentPitch;    currentPitch += pitch;

MARS_999

Aug 8, 2006 at 12:27 PM

Thanks John that worked.

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