ChestESP

import java.awt.Color;
import java.util.ArrayList;
import org.lwjgl.input.Keyboard;
import org.lwjgl.opengl.GL11;
import com.darkmagician6.eventapi.EventManager;
import net.minecraft.block.Block;
import net.minecraft.client.renderer.entity.RenderManager;
import net.minecraft.entity.item.EntityItem;
import net.minecraft.tileentity.TileEntity;
import net.minecraft.tileentity.TileEntityChest;
import net.minecraft.tileentity.TileEntityEnderChest;
import net.minecraft.util.BlockPos;

public class ChestESP extends Module {

	public ChestESP() {
		super("ChestESP", "ChestESP", Keyboard.KEY_P, Category.RENDER);
	}

	@Override
	public void onDisable() {
		EventManager.unregister(this);
		super.onDisable();
	}

	@Override
	public void onEnable() {
		EventManager.register(this);
		super.onEnable();
	}

	@Override
	public void onRender() {
		double viewerPosX = mc.getRenderManager().viewerPosX;
        double viewerPosY = mc.getRenderManager().viewerPosY;
        double viewerPosZ = mc.getRenderManager().viewerPosZ;
        double line_lenght = 0.35D;
        ArrayList<BlockPos> dontRender = new ArrayList();

        for(Object tileEntity : mc.theWorld.loadedTileEntityList) {
           if(tileEntity instanceof TileEntityChest || tileEntity instanceof TileEntityEnderChest) {
              BlockPos pos = ((TileEntity) tileEntity).getPos();
              if(!dontRender.contains(pos)) {
                    double x = -(viewerPosX - (double)pos.getX()) + 0.5D;
                    double y = -(viewerPosY - (double)pos.getY()) + 0.5D;
                    double z = -(viewerPosZ - (double)pos.getZ()) + 0.5D;
                    GL11.glPushMatrix();
                    GL11.glBlendFunc(770, 771);
                    GL11.glEnable(3042);
                    GL11.glLineWidth(1.0F);
                    GL11.glDisable(3553);
                    GL11.glDisable(2929);
                    GL11.glDepthMask(true);
                    GL11.glColor3f(155.0F, 0.0F, 0.0F);
                    GL11.glBegin(1);
                    GL11.glVertex3d(x - line_lenght, y, z);
                    GL11.glVertex3d(x + line_lenght, y, z);
                    GL11.glVertex3d(x, y + line_lenght, z);
                    GL11.glVertex3d(x, y - line_lenght, z);
                    GL11.glVertex3d(x, y, z + line_lenght);
                    GL11.glVertex3d(x, y, z - line_lenght);
                    GL11.glEnd();
                    GL11.glEnable(3553);
                    GL11.glEnable(2929);
                    GL11.glDepthMask(true);
                    GL11.glDisable(3042);
                    GL11.glPopMatrix();
              }
           }
        }
	}
}