🔒 Locked

use return value of D3DXVec3TransformCoord

Started by cozzie Mar 9, 2013 at 9:50 AM 1 replies 750+ views

Original Post

cozzie

Mar 9, 2013 at 9:50 AM

Hi.

Simple question.

I can't figure out how to use the D3DXVECTOR3 return value of:

D3DXVec3TransformCoord

It returns a D3DXVECTOR3*.

I have a a D3DXVECTOR3: mBoudingBox.min.

I tried:

mBoundingBox.min = D3DXVec3TransformCoord(NULL, &mBoundingBox.min, &mMatWorld);

But it says "no operator matches these operands".

Looking it up in MSN says that the return value is a D3DXVECTOR3*.

I have it working when I replace NULL by the output vector, but just want to know why it doesn't work as return value.

Paradigm Shifter

Mar 9, 2013 at 10:16 AM

It returns the first argument. If you pass NULL as the first argument it won't work.

The return value is just an optional convenience if you wanted to use the returned vector as an argument to another function. Ignore the return value if you don't do that.

cozzie

Mar 9, 2013 at 10:58 AM

Thanks, I'm not doing that so I'll just use the first parameter.

For code reading I found it maybe handy to read vector = D3DXvec... etc.

Topic Locked

This topic has been locked by a moderator. New replies are not allowed.