Is there a D3DX10 vector3 math function to calculate the projection of one D3DXVECTOR3 onto another?
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Probably not, but you should be able to do this in a single line anyway. – Matic Oblak Dec 12 '11 at 12:55
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@MaticOblak would you be able to show me how? – Dollarslice Dec 12 '11 at 13:05
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Mathematically projecting vector a to vector b: p = (a*(b/|b|))*(b/|b|) As for the code I do not know even what language are you writing in. Anyway, the only difference may bi in using pointers or objects..
D3DXVECTOR3 *a; //input
D3DXVECTOR3 *b; //input
D3DXVECTOR3 *tmpVec; //create new temporary vector I guess
D3DXVec3Normalize(tmpVec, b); //tmpVec becomes normalized b vector
D3DXVECTOR3 *p = tmpVec*D3DXVec3Dot(a, tmpVec); //result
I hope this helps..
Matic Oblak
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How does the last line work? you cannot multiply pointers (it won't multiply the contents, just the pointers and crash soon) – Daniel Dec 12 '11 at 13:39
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sorry, as I said, I didn't even know what language to write in and couldn't try to debug. In c++ you can lose all the pointers and put "&" symbols before vectors in functions that require pointers. – Matic Oblak Dec 12 '11 at 13:42