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The image I use is just the default color grid created in image editor. I can get the image texture node clip correctly with flat projection. enter image description here

However, I find I cannot get it clip as I expect with box projection. enter image description here

The blender manual (https://docs.blender.org/manual/en/dev/render/shader_nodes/textures/image.html) says clipping is to "set all the exterior pixels values to transparent black". Does this mean clipping will work if the texture coordinates are not between 0 and 1? Is there something wrong with my understanding of the clipping effect?

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