Texture array and linear sampling

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Hi,

I have a situation where linear sampling of a texture between two points using different indices into the same texture array causes the interpolation to move across the texture array from the texture of the first point to the texture of the second point, instead of just using the two textures to interpolate. not sure if that's clear, here's an example:

Point A uses texture index 4
Point B uses texture index 1
the line between point A and B is being drawn with texture samples from texture 4 all the way down to 1.

Attached is an example image to illustrate the problem, it's notable between the land and the sea (that yellow beach like color should not be there).

Is this a known issue and how does one get around it ?

Note that the texture array is not a static array, ie. it's declared as:
Texture2DArray g_tex and NOT Texture2D g_tex[10];

Thanks,

Dylan

JPEG image

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