4 corner gradient

[Tom De Man]

Hi,

This might be slightly off topic but I can't resist asking the experts
here:

Using the i915 I try to create a 4 corner gradient rectangle using 2 3D
primitive triangles. I get a visible diagonal line between the two
triangles (which is ugly). If I use software routines to make a gradient
rectangle it looks good.
I've tested making the rectangle with 4 triangles (all to the center), but
I get a cross then (although less visible).

Is this something due to how triangles are colored, due to some 3D param
or is it inevitable ?

Kind regards,
Tom

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