first person camera

Translate the world to your camera position, rotate it, and then translate it back.

Quote:

Original post by Blew Translate the world to your camera position, rotate it, and then translate it back.

same same but different

translate camera position to origo
rotate
translate back

Which is more used?

Thanks for your answers,

how can I get the actual camera position in DirectX?

//Global variables.
D3DXMATRIXA16 matWorld, matView;

//Void to initialize the matrices;
void InitMatrices()
{
D3DXMatrixIdentity(&matWorld);
Dev->SetTransform(D3DTS_WORLD, &matWorld);

D3DXMatrixLookAtLH(&matView, &D3DXVECTOR3(0, 0, -1.0f),
&D3DXVECTOR3(0, 0, 0),
&D3DXVECTOR3(0, 1.0f, 0));

Dev->SetTransfrom(D3DTS_VIEW, &matView);
}

//Moves the camera and a model if one.
void MoveTheCamera()
{
//say that we have a variable named bKeys[256];
//that holds the keys are pressed.

D3DXVECTOR3 vT(0, 0, 0); //Translation Vector.
D3DXVECTOR3 vR(0, 0, 0); //Rotation Vector.

if(bKeys[VK_UP] == true) vT.z += 1.0f; //Translation in the z axis.
if(bKeys[VK_DOWN] == true) vT.z -= 1.0f;
if(bKeys[VK_LEFT] == true) vR.x -= 1.0f;//Rotation in the x axis.
if(bKeys[VK_RIGHT]== true) vR.x += 1.0f;
if(bKeys['W'] == true) vR.y += 1.0f;//Rotation in the y axis.
if(bKeys['S'] == true) vR.y -= 1.0f;
if(bKeys['A'] == true) vT.x -= 1.0f;//Translation int the x axis.
if(bKeys['D'] == true) vT.x += 1.0f;

//Anyway put as many transformations as you want.


D3DXMATRIXA16 matT, matR; //Matrices for translation and rotation.
D3DXQUATERNION qR; //The quaternion, Rotates around an axis.

//move to our new position.
D3DXMatrixTranslation(&matT, vT.x, vT.y, vT.z);
D3DXMatrixMultiply(&matWorld, &matT, &matWorld);

//Rotate to our new position.
D3DXQuaternionRotationYawPitchRoll(&qR, vR.x, vR.y, vR.z);
D3DXMatrixRotationQuaternion(&matR, &qR);
D3DXMatrixMultiply(&matWorld, &matR, &matWorld);

//Make our camera view.
D3DXMatrixInverse(&matView, NULL, &matWorld);

//This code is for moving around the world with the camera and a model.
//Say that you have a model that you want to move use the matWorld matrix.
//To move the camera use the matView matrix.

//if you want the camera to have a distance with the model do this.

//matView._41 = - or + a number. moves left or right.
//matView._42 = - or + a number. moves down or up.
//matView._43 = - or + a number. moves out or in.
}

void Render()
{
Dev->SetTransform(D3DTS_VIEW, &matView);

Dev->SetTransfrom(D3DTS_WORLD, &matWorld);

//Draw the model;
.....
.....
.....
///
}



Sorry about my english if there is any mistake but nobody is perfect and
i'm not nobody.

If you have any questions let me know.

//And if you want to get the camera position do this

void GetCameraPos(D3DXMATRIXA16 *matPos)
{
Dev->GetTransform(D3DTS_VIEW, matPos);
}

good luck!!!

this is c++ code but if you take a look at it you'll understand what i'm
talking about.