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Drawing several grids of points

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Hello, I'm wondering what's the proper approach to draw grids of different sizes. So far I'm using a buffer for grid transforms, another for point info.

for (size_t i=0;i<NUMGRIDS;i++)
	size_t numpoints=grids[i].w*grids[i].h;
	glVertexAttrib4f(gridAttrib,grids[i].x,grids[i].y.....);// grid pos&scale

I don't think instancing is an option since grids don't have the same number of points.

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