help me convert a third person camera in d3d11 to d3d9

Graphics and GPU Programming Programming

Started by Anddos November 17, 2012 02:30 PM

4 comments, last by Anddos 11 years, 5 months ago

588

Author

November 17, 2012 02:30 PM

I have found a nice example for a third person such like you see in the grand theft auto games, its in d3d11 but i want to convert it to d3d9 , i dont feel i know enough for d3d11 yet so i want to stay at d3d9 and implement this code

here is the directx 11 code



void UpdateCamera()

{

	//d3d11 code

	camTarget = charPosition;

	camTarget = XMVectorSetY(camTarget, XMVectorGetY(camTarget)+5.0f);	

	camRotationMatrix = XMMatrixRotationRollPitchYaw(camPitch, camYaw, 0);

	camPosition = XMVector3TransformNormal(DefaultForward, camRotationMatrix );

	camPosition = XMVector3Normalize(camPosition);

	camPosition = (camPosition * charCamDist) + camTarget;

	camForward = XMVector3Normalize(camTarget - camPosition);	// Get forward vector based on target

	camForward = XMVectorSetY(camForward, 0.0f);	// set forwards y component to 0 so it lays only on

	camForward = XMVector3Normalize(camForward);

	camRight = XMVectorSet(-XMVectorGetZ(camForward), 0.0f, XMVectorGetX(camForward), 0.0f);

	camUp =XMVector3Normalize(XMVector3Cross(XMVector3Normalize(camPosition - camTarget), camRight));

	camView = XMMatrixLookAtLH( camPosition, camTarget, camUp );

}

here is my attempt with d3d9



void UpdateCamera()

{



camTarget = charPosition;

camTarget.y = ((camTarget.y)+5.0f);

camRotationMatrix = D3DXMatrixRotationYawPitchRoll(&amp;amp;amp;amp;amp;amp;yawPitchRollMat,-camPitch, camYaw, 0); //d3d9

camPosition = D3DXVec3TransformNormal(&amp;amp;amp;amp;amp;amp;DefaultForward,&amp;amp;amp;amp;amp;amp;DefaultForward, camRotationMatrix );

//so far i am stuck on this line, because camPosition should be D3DXVECTOR3* but if i set it to that, then the code below is broken , please can anyone help with coverting this to work with d3d9.







camPosition = D3DXVec3Normalize(&amp;amp;amp;amp;amp;amp;camPosition,&amp;amp;amp;amp;amp;amp;camPosition);

camPosition = ((*camPosition * charCamDist)) + camTarget;

camvec3 = camTarget - camPosition;

camForward = D3DXVec3Normalize(&amp;amp;amp;amp;amp;amp;camvec3,&amp;amp;amp;amp;amp;amp;camvec3); // Get forward vector based on target

camForward = XMVectorSetY(camForward, 0.0f); // set forwards y component to 0 so it lays only on

camForward = XMVector3Normalize(camForward);

camRight = XMVectorSet(-XMVectorGetZ(camForward), 0.0f, XMVectorGetX(camForward), 0.0f);

camUp =XMVector3Normalize(XMVector3Cross(XMVector3Normalize(camPosition - camTarget), camRight));

camView =  D3DXMatrixLookAtLH( camPosition, camTarget, camUp );

*/



}

here is a picture of the d3d11 app

http://imageshack.us/f/5/thirdpersoncam.jpg

simpler

927

November 17, 2012 03:15 PM

You can change
[source lang="cpp"]camPosition = D3DXVec3TransformNormal(&DefaultForward,&DefaultForward, camRotationMatrix );[/source]
To
[source lang="cpp"]D3DXVec3TransformNormal(&camPosition,&DefaultForward, camRotationMatrix );[/source]
Since the first argument gets set to the result of the operation as well. Now camPosition don't have to be a pointer any more.

My homepage, twitter and github

Anddos

588

Author

November 17, 2012 04:40 PM

how would i do this line then

camForward = XMVector3Normalize(camTarget - camPosition); // Get forward vector based on target

simpler

927

November 17, 2012 04:52 PM

[source lang="cpp"]D3DXVec3Normalize(&camForward, &(camTarget - camPosition));[/source]

I recommend taking a look at this page to see the DirectXMath counterpart for all D3DXMath functions.

My homepage, twitter and github

Anddos

588

Author

November 17, 2012 04:53 PM

so far i have



camTarget = charPosition;

camTarget.y = ((camTarget.y)+5.0f);

camRotationMatrix = D3DXMatrixRotationYawPitchRoll(&amp;amp;amp;amp;amp;yawPitchRollMat,-camPitch, camYaw, 0); //d3d9

D3DXVec3TransformNormal(&amp;amp;amp;amp;amp;camPosition,&amp;amp;amp;amp;amp;DefaultForward, camRotationMatrix );

D3DXVec3Normalize(&amp;amp;amp;amp;amp;camPosition,&amp;amp;amp;amp;amp;camPosition);

camPosition = ((camPosition * charCamDist)) + camTarget;

D3DXVec3Normalize((&amp;amp;amp;amp;amp;camForward),&amp;amp;amp;amp;amp;(camTarget - camPosition)); // Get forward vector based on target



camForward.y = camForward.y = 0.0f; // set forwards y component to 0 so it lays only on

D3DXVec3Normalize((&amp;amp;amp;amp;amp;camForward),&amp;amp;amp;amp;amp;(camForward));

now i am stuck

would this be

camRight = XMVectorSet(-XMVectorGetZ(camForward), 0.0f, XMVectorGetX(camForward), 0.0f);

camRight.z = -camForward.z,
camRight.y = 0.0f,
camRight.z = camForward.x

Anddos

588

Author

November 18, 2012 06:19 AM

i cannot for the life of me get this line right

//camUp =XMVector3Normalize(XMVector3Cross(XMVector3Normalize(camPosition - camTarget), camRight)); //d3d11

D3DXVec3Normalize(&camUp,D3DXVec3Cross(D3DXVec3Normalize(&(camPosition - camTarget), &camRight))); //d3d9

help me convert a third person camera in d3d11 to d3d9

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