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md3dDevice->GetTransform(D3DTS_PROJECTION,&pm); md3dDevice->GetTransform(D3DTS_VIEW,&vm); D3DXMATRIX vp; D3DXMatrixMultiply( &vp, &vm, &pm ); D3DXVECTOR4 posBase; D3DXVec4Transform(&posBase,&D3DXVECTOR4(m_positionVal.x,m_positionVal.y,m_positionVal.z,1.0f),&vp); posBase.x/=posBase.w; // Screen space X pos posBase.y/=posBase.w; // Screen space Y pos posBase.z/=posBase.w;
#5008003 Calculate screen co-ords from a point in 3D space
Posted by
on 06 December 2012 - 11:47 PM
Simply transform your 3d position by view projection matrix .
#5007777 Creating Bullet Holes
Posted by
on 06 December 2012 - 09:11 AM
1- "p" is your intersected point
2- "v1,v2,v3" are your intersected face vertices
3- "N" is your face normal or you can calculate it from your vertices
{
A = v2 - v1
B = v3 - v1
N = normalize( cross( A , B ) )
}
4- Calculate your Up and Right vector
{
up = normalize( p - v1 )
right = cross( up , N )
}
5- "Q1,Q2,Q3,Q4" are your Quad vertices and can calculate like this
{
Q1 = p + up * scale
Q2 = p - up * scale
Q3 = p + right * scale
Q4 = p - right * scale
}
2- "v1,v2,v3" are your intersected face vertices
3- "N" is your face normal or you can calculate it from your vertices
{
A = v2 - v1
B = v3 - v1
N = normalize( cross( A , B ) )
}
4- Calculate your Up and Right vector
{
up = normalize( p - v1 )
right = cross( up , N )
}
5- "Q1,Q2,Q3,Q4" are your Quad vertices and can calculate like this
{
Q1 = p + up * scale
Q2 = p - up * scale
Q3 = p + right * scale
Q4 = p - right * scale
}