Rotate Model

Math and Physics Programming

Started by chris.sermanni October 07, 2011 07:00 PM

3 comments, last by Molle85 12 years, 6 months ago

chris.sermanni

100

Author

October 07, 2011 07:00 PM

Hi every one ...

i want to rotate my 3dmodel in roll-pitch-yaw axis

i have just axis(x,y,z) vector and up(x,y,z) vector

so how to rotate my model by axis(x,y,z) vector + up(x,y,z) vector values?

please lookout my simple code...



D3DXVECTOR3 * axis=new D3DXVECTOR3;

axis->x = -0.14;

axis->y = -0.99; 

axis->z = -0.04; 



D3DXVECTOR3 * up=new D3DXVECTOR3;

up->x = -0.99; 

up->y =  0.14; 

up->z =  0.07;  



D3DXMATRIXA16 mWorld;   



///////////////////////////////////////////////////////////////////



D3DXMatrixRotationAxis(&mWorld,axis,180);   //is true ? 

D3DXMatrixRotationAxis(&mWorld,up,180); 	// is true ?  



////////////////////////////////////////////////////////////////////



mWorld *= *g_Camera.GetWorldMatrix();  



D3DXMATRIXA16 mProj;

mProj = *g_Camera.GetProjMatrix();



D3DXMATRIXA16 mView;

mView = *g_Camera.GetViewMatrix();  



D3DXMATRIXA16 mWorldViewProjection;

mWorldViewProjection = mWorld * mView * mProj; 



V( g_pEffect9->SetMatrix( g_hmWorldViewProjection, &mWorldViewProjection ) );

Molle85

172

October 07, 2011 07:33 PM

You might wanna use D3DXMatrixLookAtLH

chris.sermanni

100

Author

October 08, 2011 06:57 AM

thanks for your answer Molle85
can you please show me how to use it ?
i try to do it myself but model not rotate in a true direction....

D3DXVECTOR3 * axis=new D3DXVECTOR3;

axis->x = -0.14;

axis->y = -0.99; 

axis->z = -0.04; 



D3DXVECTOR3 * up=new D3DXVECTOR3;

up->x = -0.99; 

up->y =  0.14; 

up->z =  0.07;  



D3DXMATRIXA16 mWorld;   



///////////////////////////////////////////////////////////////////



D3DXMatrixLookAtLH(&mWorld,g_Camera.GetEyePt(),axis,up);



////////////////////////////////////////////////////////////////////



mWorld *= *g_Camera.GetWorldMatrix();  



D3DXMATRIXA16 mProj;

mProj = *g_Camera.GetProjMatrix();



D3DXMATRIXA16 mView;

mView = *g_Camera.GetViewMatrix();  



D3DXMATRIXA16 mWorldViewProjection;

mWorldViewProjection = mWorld * mView * mProj; 



V( g_pEffect9->SetMatrix( g_hmWorldViewProjection, &mWorldViewProjection ) );

chris.sermanni

100

Author

October 08, 2011 07:10 AM

[size="4"] is there any way or formula to convert :

[size="5"]axis(x,y,z) & up(x,y,z) vectors to (roll - pitch - yaw) ? :mellow:

also you know we need use "axis" and "up" vector both together to calculate. because in some direction of y we must change place of x value by z ....

Molle85

172

October 08, 2011 06:12 PM

Don't allocate the vectors with 'new' btw, you pass their address to d3d functions

D3DXVECTOR3 forward(0,0,1);
D3DXVECTOR3 up(0,1,0);

Make sure they're normalized

D3DXMatrixLookAtLH( &mWorld, &D3DXVECTOR3(0,0,0), &forward, &up );

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