%mathent; ]> 2011-2014 Khronos Group gl_InstanceID 3G gl_InstanceID contains the index of the current primitive in an instanced draw command in highp int gl_InstanceID gl_InstanceID is a vertex language input variable that holds the integer index of the current primitive in an instanced draw command such as glDrawArraysInstanced. If the current primitive does not originate from an instanced draw command, the value of gl_InstanceID is zero. gl_InstanceID gl_VertexID Copyright 2011-2014 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. http://opencontent.org/openpub/.