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Create a bash array from a flat file of whitespaces only.

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Try also
ARRAY=( $(sed 's/./&,/g;' /tmp/ARRAY) )

You may want to save the old IFS value beforehand.
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glProvokingVertex - specifiy the vertex to be used as the source of data for flat shaded varyings
void glProvokingVertex(GLenum provokeMode);
provokeMode Specifies the vertex to be used as the source of data for flat shaded varyings.
Flatshading a vertex shader varying output means to assign all vetices of the primitive the same value for that output. The vertex from which these values is derived is known as the provoking vertex and glProvokingVertex specifies which vertex is to be used as the source of data for flat shaded varyings. provokeMode must be either GL_FIRST_VERTEX_CONVENTION or GL_LAST_VERTEX_CONVENTION, and controls the selection of the vertex whose values are assigned to flatshaded varying outputs. The interpretation of these values for the supported primitive types is: If a vertex or geometry shader is active, user-defined varying outputs may be flatshaded by using the flat qualifier when declaring the output.
glProvokingVertex is available only if the GL version is 3.2 or greater.
GL_INVALID_ENUM is generated if provokeMode is not an accepted value.
Copyright (C) 2010 Khronos Group. This material may be distributed subject to the terms and conditions set forth in the Open Publication License, v 1.0, 8 June 1999. OpenGL 3.3 03/08/2011 GLPROVOKINGVERTEX(3G)

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