Matrix4x4.ortho

Calculate a prthographic projection

See: <a href="http://www.songho.ca/opengl/gl_projectionmatrix.html#ortho">here</a>

struct Matrix4x4
@nogc
bool
ortho
pure nothrow
(
const Rect rect
,
float zNear = 1
,
float zFar = -1
)

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