通过矩阵变换实现绕三个坐标轴的特定角度的旋转:
//-----------------------------------------------------------------------------
// Desc: 设置世界矩阵
//-----------------------------------------------------------------------------
VOID SetWorldMatrix()
{
static long curTime=0;
static float elapsetime=0;
elapsetime = (timeGetTime()-curTime)/1000.0f;
curTime = timeGetTime();
//创建并设置世界矩阵
float fRoll, fPitch, fYaw;
fRoll = fPitch = fYaw = 0.0f;
if (m_bKey['D']) fRoll -= 3*elapsetime;
if (m_bKey['A']) fRoll += 3*elapsetime;
if (m_bKey['S']) fPitch -= 3*elapsetime;
if (m_bKey['W']) fPitch += 3*elapsetime;
if (m_bKey['Q']) fYaw -= 3*elapsetime;
if (m_bKey['E']) fYaw += 3*elapsetime;
//更新网格模型姿态
static D3DXVECTOR3 vRight, vUp, vLook, vPos;
vRight.x = g_matWorld._11;
vRight.y = g_matWorld._12;
vRight.z = g_matWorld._13;
vUp.x = g_matWorld._21;
vUp.y = g_matWorld._22;
vUp.z = g_matWorld._23;
vLook.x = g_matWorld._31;
vLook.y = g_matWorld._32;
vLook.z = g_matWorld._33;
vPos.x = g_matWorld._41;
vPos.y = g_matWorld._42;
vPos.z = g_matWorld._43;
D3DXVec3Normalize(&vLook, &vLook);
D3DXVec3Cross(&vRight, &vUp, &vLook);
D3DXVec3Normalize(&vRight, &vRight);
D3DXVec3Cross(&vUp, &vLook, &vRight);
D3DXVec3Normalize(&vUp, &vUp);
static D3DXMATRIX matPitch, matYaw, matRoll;
D3DXMatrixRotationAxis(&matYaw, &vUp, fYaw);
D3DXVec3TransformCoord(&vLook, &vLook, &matYaw);
D3DXVec3TransformCoord(&vRight, &vRight, &matYaw);
D3DXMatrixRotationAxis(&matRoll, &vLook, fRoll);
D3DXVec3TransformCoord(&vRight, &vRight, &matRoll);
D3DXVec3TransformCoord(&vUp, &vUp, &matRoll);
D3DXMatrixRotationAxis(&matPitch, &vRight, fPitch);
D3DXVec3TransformCoord(&vLook, &vLook, &matPitch);
D3DXVec3TransformCoord(&vUp, &vUp, &matPitch);
g_matWorld._11 = vRight.x;
g_matWorld._12 = vRight.y;
g_matWorld._13 = vRight.z;
g_matWorld._21 = vUp.x ;
g_matWorld._22 = vUp.y ;
g_matWorld._23 = vUp.z;
g_matWorld._31 = vLook.x;
g_matWorld._32 = vLook.y;
g_matWorld._33 = vLook.z;
//向前移动
if (m_bKey['F'])
{
g_matWorld._41 += 30*elapsetime * vLook.x;
g_matWorld._42 += 30*elapsetime * vLook.y;
g_matWorld._43 += 30*elapsetime * vLook.z;
}
//向后移动
if (m_bKey['V'])
{
g_matWorld._41 -= 30*elapsetime * vLook.x;
g_matWorld._42 -= 30*elapsetime * vLook.y;
g_matWorld._43 -= 30*elapsetime * vLook.z;
}
g_pd3dDevice->SetTransform( D3DTS_WORLD, &g_matWorld );
}
通过四元数实现绕三个坐标轴的特定角度的旋转:
//-----------------------------------------------------------------------------
// Desc: 设置世界矩阵
//-----------------------------------------------------------------------------
VOID SetWorldMatrix()
{
static long curTime=0;
static float elapsetime=0;
elapsetime = (timeGetTime()-curTime)/1000.0f;
curTime = timeGetTime();
//创建并设置世界矩阵
float fRoll, fPitch, fYaw;
fRoll = fPitch = fYaw = 0.0f;
if (m_bKey['D']) fRoll -= 3*elapsetime;
if (m_bKey['A']) fRoll += 3*elapsetime;
if (m_bKey['S']) fPitch -= 3*elapsetime;
if (m_bKey['W']) fPitch += 3*elapsetime;
if (m_bKey['Q']) fYaw -= 3*elapsetime;
if (m_bKey['E']) fYaw += 3*elapsetime;
//更新网格模型姿态
D3DXQUATERNION qR;
D3DXMATRIX matRot;
D3DXQuaternionRotationYawPitchRoll (&qR, fYaw, fPitch, fRoll);
D3DXMatrixRotationQuaternion (&matRot, &qR);
D3DXMatrixMultiply (&g_matWorld, &matRot, &g_matWorld);
//获取网格模型前向量
static D3DXVECTOR3 vLook;
vLook.x = g_matWorld._31;
vLook.y = g_matWorld._32;
vLook.z = g_matWorld._33;
//向前移动
if (m_bKey['F'])
{
g_matWorld._41 += 10*elapsetime * vLook.x;
g_matWorld._42 += 10*elapsetime * vLook.y;
g_matWorld._43 += 10*elapsetime * vLook.z;
}
//向后移动
if (m_bKey['V'])
{
g_matWorld._41 -= 10*elapsetime * vLook.x;
g_matWorld._42 -= 10*elapsetime * vLook.y;
g_matWorld._43 -= 10*elapsetime * vLook.z;
}
g_pd3dDevice->SetTransform( D3DTS_WORLD, &g_matWorld );
}
本文转自Phinecos(洞庭散人)博客园博客，原文链接：http://www.cnblogs.com/phinecos/archive/2008/06/13/1219293.html，如需转载请自行联系原作者
