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fps camera

Started by shakazed Jan 19, 2004 at 2:31 PM 3 replies 1k views

Original Post

Jan 19, 2004 at 2:31 PM

Hi! This is my function for moving in a 3d scene.


HRESULT GetKeyPress(void)
{
	if(GetAsyncKeyState(VK_RIGHT))
	{
		sPlayer.Angle = sPlayer.Angle - 0.05f;
		sPlayer.lx = sPlayer.x + cosf(sPlayer.Angle);
		sPlayer.lz = sPlayer.z + sinf(sPlayer.Angle);
	}

	if(GetAsyncKeyState(VK_LEFT))
	{
		sPlayer.Angle = sPlayer.Angle + 0.05f;
		sPlayer.lx = sPlayer.x - cosf(sPlayer.Angle);
		sPlayer.lz = sPlayer.z - sinf(sPlayer.Angle);	
	}

	if(GetAsyncKeyState(VK_UP))
	{
		sPlayer.x = sPlayer.x + cosf(sPlayer.Angle)*(sPlayer.MoveRate);
		sPlayer.z = sPlayer.z + sinf(sPlayer.Angle)*(sPlayer.MoveRate);
	}
		
	if(GetAsyncKeyState(VK_DOWN))
	{
		sPlayer.x = sPlayer.x - cosf(sPlayer.Angle)*(sPlayer.MoveRate);
		sPlayer.z = sPlayer.z - sinf(sPlayer.Angle)*(sPlayer.MoveRate);
	}

	return S_OK;
}

I can turn around allright though when trying to move in any direction it gets all screwed up. Do you see what the heck I´ve done wrong? Any help apprectiated.

grhodes_at_work

Mod

198

grhodes_at_work

Jan 19, 2004 at 5:08 PM

What exactly do you do with the sPlayer.x/y and sPlayer.lx/ly variables? And how large is your move rate, e.g., is it large compared to the size of your game world?

Graham Rhodes
Senior Scientist
Applied Research Associates, Inc.

shakazed

Author

shakazed

Jan 20, 2004 at 1:04 AM

The lx,ly, lz variables are lookat point. x,y,z is the position of the camera. Moverate is 0.5f, which would be fairly small. I´ve loaded a .x model of a landscape which I´m (later on) will implement terrain following on. First I just want the camera to move correct.
The sPlayer struct looks like:


struct Player
{
   float Angle,x,y,z,lx,ly,lz,MoveRate;
}

And is defined like this:



Player sPlayer = {0.0f,0.0f,0.0f,0.0f,0.0f,0.0f,0.0f,0.0f};

tri-thanatos

Jan 20, 2004 at 7:58 AM

have you updated your view matrix after all of this?

shakazed

Author

shakazed

Jan 20, 2004 at 11:06 AM

Yes I can rotate my camera around it´s axis. It´s just when I move forward/backwards it gets all wrong.

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