Stellar
Joined: 12 Dec 2005
Posts: 48
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 Posted: Fri Jan 20, 2006 3:17 am Post subject: (got it) D3DXVec3TransformCoord & D3DXMatrixRotationAxis |
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I didnt know if there were higher level functions already written for this, but if not, i did it from scratch :)
D3DXMATRIX * D3DXMatrixRotationAxis(
D3DXMATRIX * pOut,
CONST D3DXVECTOR3 * pV,
FLOAT Angle
);
D3DXVECTOR3 * D3DXVec3TransformCoord(
D3DXVECTOR3 * pOut,
CONST D3DXVECTOR3 * pV,
CONST D3DXMATRIX * pM
);
____________________________________________
UPDATE: this is what i got for transform
| Code: |
ScePspFVector3 Vector3TransformCoord(
ScePspFVector3 vector,
ScePspFMatrix4 matrix
)
{
ScePspFVector3 temp;
temp.x = matrix.x.x * vector.x + matrix.x.y * vector.y + matrix.x.z * vector.z;
temp.y = matrix.y.x * vector.x + matrix.y.y * vector.y + matrix.y.z * vector.z;
temp.z = matrix.z.x * vector.x + matrix.z.y * vector.y + matrix.z.z * vector.z;
return temp;
}
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and heres the code for rotate, but i havent tried the functions yet.
| Code: |
ScePspFMatrix4 XlMatrixRotationAxis(
ScePspFVector3 vector,
float angle
)
{
ScePspFMatrix4 temp;
float sin_a = sin( angle );
float cos_a = cos( angle );
float x_y = vector.x * vector.y;
float x_z = vector.x * vector.z;
float y_z = vector.y * vector.z;
temp.x.x = 1 + ( 1 - cos_a ) * ( vector.x * vector.x - 1 );
temp.x.y = -vector.z * sin_a + ( 1 - cos_a ) * x_y;
temp.x.z = vector.y * sin_a + ( 1 - cos_a ) * x_z;
temp.x.w = 0;
temp.y.x = vector.z * sin_a + ( 1 - cos_a ) * x_y;
temp.y.y = 1 + ( 1 - cos_a ) * ( vector.y * vector.y - 1 );
temp.y.z = -vector.x * sin_a + ( 1 - cos_a ) * y_z;
temp.y.z = 0;
temp.z.x = -vector.y * sin_a + ( 1 - cos_a ) * x_z;
temp.z.y = vector.x * sin_a + ( 1 - cos_a ) * y_z;
temp.z.z = 1 + ( 1 - cos_a ) * ( vector.z * vector.z -1 );
temp.z.w = 0;
temp.w.x = 0;
temp.w.y = 0;
temp.w.z = 0;
temp.w.w = 1;
return temp;
}
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thanks,
-stellar
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