//start
public synchronized void drawOutlines() {
    if(Configs.Generic.OUTLINE_SHOWN.getBooleanValue()) {
        Tessellator tessellator = Tessellator.getInstance();
        BufferBuilder buffer = tessellator.getBuffer();
        buffer.begin(GL11.GL_LINES, DefaultVertexFormats.POSITION_COLOR);
        for(PlayereditSet editsForPlayer : _playerEdits.values()) {
            editsForPlayer.drawOutlines(buffer);
        }
        tessellator.draw();
    }
}

//PlayerEditSet
public synchronized void drawOutlines(BufferBuilder buffer) {
    if(isVisible()) {
        if(Configs.Generic.OUTLINE_SHOWN.getBooleanValue()) {
            for(BlockEdit edit : _edits) {
                edit.drawOutline(buffer);
            }
        }
    }
}

//BlockEdit
public void drawOutline(BufferBuilder buffer) {
    IBakedModel model;
    IBlockState state = (IRegistry.BLOCK.get(new ResourceLocation(block.getName()))).getDefaultState();
    model = this.blockModelShapes.getModel(state);
    RenderUtils.drawBlockModelQuadOverlayBatched(model, state, new BlockPos(x, y, z), block.getColor(), 0, buffer);
}