I am having problem with a custom rendering, I am using it to render blocks seemingly normally but with great diversity in a simple manner. The issue is that the sides come out darkened

 

http://i1310.photobucket.com/albums/s644/EmperorZelos/2015-08-22_12.32.45_zpsvfkcwpoe.png[/img]

 

Like this, this is my code

 

package aerosteam.renderer.blocks;

import net.minecraft.block.Block;
import net.minecraft.client.Minecraft;
import net.minecraft.client.gui.FontRenderer;
import net.minecraft.client.renderer.Tessellator;
import net.minecraft.client.renderer.entity.RenderItem;
import net.minecraft.client.renderer.texture.TextureManager;
import net.minecraft.client.renderer.texture.TextureMap;
import net.minecraft.client.renderer.tileentity.TileEntitySpecialRenderer;
import net.minecraft.entity.item.EntityItem;
import net.minecraft.init.Blocks;
import net.minecraft.item.Item;
import net.minecraft.item.ItemStack;
import net.minecraft.tileentity.TileEntity;
import net.minecraft.util.IIcon;
import net.minecraft.util.ResourceLocation;
import net.minecraftforge.common.util.ForgeDirection;

import org.lwjgl.opengl.GL11;

import aerosteam.AeroSteam;
import aerosteam.model.blocks.ModelBarrel;
import aerosteam.recipes.Beverages;
import aerosteam.tileentity.TileEntityBarrel;

public class RenderPipeBlock extends TileEntitySpecialRenderer{

float[] dx = {0.5F,0.5F,0F,0F,0.5F,0.5F};
float[] dy = {0F,0F,0.5F,0.5F,0.5F,0.5F};
float[] dz = {0.5F,0.5F,0.5F,0.5F,0F,0F};

Block test = Blocks.brick_block;

public RenderPipeBlock(){
}
    
@Override
public void renderTileEntityAt(TileEntity entity, double x,double y, double z, float f) {
	//TileEntityBarrel barrel = (TileEntityBarrel) entity;


	IIcon icon = test.getIcon(5, 6);
	Tessellator t = Tessellator.instance;
	float minU = icon.getMinU();
	float minV = icon.getMinV();
	float maxU = icon.getMaxU();
	float maxV = icon.getMaxV();
	int sizeX = 16;
	int sizeY = 16;
	Minecraft.getMinecraft().renderEngine.bindTexture(TextureMap.locationBlocksTexture);
	GL11.glPushMatrix();
		//GL11.glTranslatef((float)x+0.5F, (float)y+1.5F, (float)z+0.5F);
		//GL11.glRotatef(180, 0F, 0F, 1F);
		GL11.glTranslated(x, y, z);
		//GL11.glEnable(GL11.GL_BLEND);
		t.startDrawingQuads();
		t.addVertexWithUV(1, 1, 0, minU, minV); //Top right
		t.addVertexWithUV(1, 0, 0, minU, maxV); //Bottom right
		t.addVertexWithUV(0, 0, 0, maxU, maxV); //Bottom left texture
		t.addVertexWithUV(0, 1, 0, maxU, minV); //Top left
		t.draw();
	GL11.glPopMatrix();

}
public void renderItem(TileEntity entity){
	TileEntityBarrel ana = (TileEntityBarrel) entity;
	renderTileEntityAt(ana,0D,-0.5D,0D,0F);
}
}

What is it missing that is causing this darkening? The "isOpaque" is set to false also.

I have noticed if I use GL11.glDisable(GL11.GL_LIGHTING); it looks good from the sides but underneath it gets too bright then.