Why doesn't Vulcan use a “standard Cartesian” coordinate system?

Question

The volcano uses a coordinate system, where (-1, -1) is in the upper left quadrant instead of the lower left quadrant, as in the standard Cartesian coordinate system, which is usually learned in school. So, (-1, 1) is located in the lower left quadrant in the Vulcan coordinate system.

(image from: http://vulkano.rs/guide/vertex-input )

What are the benefits of using the Vulcan coordinate system? One of the advantages that I see is pedagogical: it makes people realize that coordinate systems are arbitrary and can be easily compared between them. However, I doubt the reason for the design.

So what are the design reasons for this choice?

Answer 1

y.

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, , , . , y , .

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Answer 2

OpenGL , NDC window , , ( ) , y [0..1] . y-flip , , .

, Vulkan , y-down - y, .

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, Vulkan , D3D, , API. , VK_KHR_maintenance1 , y-flip . (D3D y-flip .)

, . , .