D3DXMatrixOrthoLH width and height

Graphics and GPU Programming Programming

Started by Firecore November 19, 2008 03:35 AM

1 comment, last by Firecore 15 years, 5 months ago

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November 19, 2008 03:35 AM

Hi guys. Whanted to know, when we use D3DXMatrixOrthoLH, what does the function mean by width and height. For example, when it says height, does it mean my max y-axis value = height or does it mean the height from one end to the other?

Evil Steve

2,021

November 19, 2008 05:41 AM

Quote:Original post by Firecore
Hi guys.
Whanted to know, when we use D3DXMatrixOrthoLH, what does the function mean by width and height.
For example, when it says height, does it mean my max y-axis value = height or does it mean the height from one end to the other?

From the docs for D3DXMatrixOrthoOffCenterLH:

Quote:The D3DXMatrixOrthoLH function is a special case of the D3DXMatrixOrthoOffCenterLH function. To create the same projection using D3DXMatrixOrthoOffCenterLH, use the following values: l = -w/2, r = w/2, b = -h/2, and t = h/2.

So width and height are the length of the X and Y axes, and the coordinate range is from (-x/2, -y/2) to (x/2, y/2).