object_pos += direction*velocity;Quote:Original post by Tano_ITAI'm not sure if Ripiz' answer is entirely correct, but the short answer to your question is, build a matrix from your yaw, pitch, and roll angles, and then extract the direction vectors directly from the matrix (they'll be in the first three rows of the matrix).
If i've my object with Yaw = 0.0f, Pitch = 0.0f, Roll = 0.0f and i apply that. I've a vector like this (1, 0, 0). And the object translate on X axis..
Wher i wrong?
D3DXVECTOR3 GameObject::GetDirection(){ D3DXMATRIX mxRotation; D3DXMatrixRotationYawPitchRoll( &mxRotation, transform.yaw, transform.pitch, transform.roll ); D3DXVec3TransformNormal( &transform.direction, &transform.direction, &mxRotation ); D3DXVec3Normalize(&transform.direction, &transform.direction); return transform.direction;}Quote:Original post by Tano_ITAAssuming the object orientation is built from those angles as well, you don't want to transform the existing direction vectors by the rotation transform, but rather the cardinal basis vectors ((1, 0, 0), (0, 1, 0), and (0, 0, 1)). Of course that's the same as simply extracting the direction vectors from the first three rows of the matrix, which again is what I would recommend.
I've do something like this:D3DXVECTOR3 GameObject::GetDirection(){ D3DXMATRIX mxRotation; D3DXMatrixRotationYawPitchRoll( &mxRotation, transform.yaw, transform.pitch, transform.roll ); D3DXVec3TransformNormal( &transform.direction, &transform.direction, &mxRotation ); D3DXVec3Normalize(&transform.direction, &transform.direction); return transform.direction;}
But it works fine only when i go on the Z direction, i will try to use the first row of matrix.
void GameObject::Update(){ D3DXMatrixScaling(&m_mat_scale, transform.scale.x, transform.scale.y, transform.scale.z); D3DXMatrixRotationYawPitchRoll( &m_Rotation, transform.yaw, transform.pitch, transform.roll ); D3DXVec3TransformNormal( &transform.direction, &transform.direction, &m_Rotation ); D3DXVec3Normalize(&transform.direction, &transform.direction); D3DXMatrixTranslation(&m_mat_position, transform.position.x, transform.position.y, transform.position.z); NinjaEngineDevice::get_ist()->m_d3d_device->SetTransform(D3DTS_WORLD, &( m_Rotation * m_mat_position * m_mat_scale)); for(m_itr = m_GameComponents.begin(); m_itr != m_GameComponents.end(); m_itr++) { /*(*m_itr).second->Update();*/ (*m_itr)->Update(); }}D3DXVECTOR3 GameObject::GetDirection(){ D3DXMATRIX mxRotation; D3DXMatrixRotationYawPitchRoll( &mxRotation, transform.yaw, transform.pitch, transform.roll ); D3DXVec3TransformNormal( &transform.direction, &transform.direction, &mxRotation ); D3DXVec3Normalize(&transform.direction, &transform.direction); return transform.direction;}Quote:Assuming the object orientation is built from those angles as well, you don't want to transform the existing direction vectors by the rotation transform, but rather the cardinal basis vectors ((1, 0, 0), (0, 1, 0), and (0, 0, 1)). Of course that's the same as simply extracting the direction vectors from the first three rows of the matrix, which again is what I would recommend.Maybe I'm misunderstanding what you're wanting, but if the goal is to acquire the local basis vectors of the object, you can just extract them directly from the orientation matrix as I mentioned previously.
Quote:Original post by jyk
From my earlier post
