Fix cracking between quantized terrain tiles in 2D. #3486
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pjcozzi
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Jan 28, 2016
Fix cracking between quantized terrain tiles in 2D.
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For #3393.
In 2D, the texture coordinates of the tile are interpolated over the rectangle to get the position in the vertex shader. When the texture coordinates are quantized, error is introduced. This can be seen through the 1px wide cracking between the quantized tiles in 2D. To compensate for the error, move the expand the rectangle in each direction by half the error amount.