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Triangle vertices don´t move equally

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I´m using C++ and DirectX 9

I´ve created a triangle whit 3 vertices

(0,0,0)
(0,10,50)
(10,0,0)

When I move the triangle whit
[code]
3DXMATRIX matTranslateA;
x-=0.5f;
D3DXMatrixTranslation(&matTranslateA, x, y, z);
d3ddev->SetTransform(D3DTS_WORLD, &matTranslateA);
[/code]
The triangle moves to the left. But the vertex whit the z=50 moves slower than the other 2 vertices resulting in a rotation...
How can I make sure the whole triangle moves equally?

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B_old is right if you set that 50 to 0 im sure they would all move equally. Imagine it as if you were looking at some distant hills and you have a tree a few feet in front of you, if you moved to the side the tree would quickly move out of view but the hills would still be in view.

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Your right,

From the camera view it really looks like the position changed.
But I took a pair of scissors and I saw the same effect as whit the triangle.
Funny how some things in real life goes whiteout thinking
But as soon as it happens in a 3D program it seems like something is wrong.
I was worried the actual position of the vertices where wrong what would result in a strange object

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