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David Gobbi authored
The 3D image mapper displays the image as a texture on a polygon. Rendering the polygon with GL_POLYGON is deprecated in OpenGL 3 and seemed to cause rendering issues with some drivers. Switch to GL_TRIANGLE_STRIP to see if it fixes these issues. Change-Id: I5d2e3f23d4ddd26cb359f23871c1c6afe41e8c69
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