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 );}