I'm get a null pointer exception at renderBlocks.renderFaceYNeg(TMBlocks.essentiaContainer, -0.5D, 0.0D, -0.5D, icon); and I'm not quite sure if I'm just being blind to something or I'm guinely missing something.

 

In RenderBlocks it point to  double d3 = (double)par8Icon.getInterpolatedU(this.renderMinX * 16.0D);  which shouldn't cause a problem since the renderMinX should be the first renderBounds which is 0.25D.

 

public class TileEssentiaContainerRenderer extends TileEntitySpecialRenderer{

ModelEssentiaContainer model = new ModelEssentiaContainer();

private static final ResourceLocation modelTexture = new ResourceLocation(Reference.MODEL_ESSENTIA_CONTAINER_TEXTURE);

public void renderTileEntityAt(TileEntity entity, double x, double y, double z, float t) {
	TileEssentiaContainer container = (TileEssentiaContainer)entity;
	GL11.glPushMatrix();
	GL11.glTranslatef((float)x, (float)y, (float)z);
	GL11.glScalef(-1F, -1F, 1f);
	GL11.glTranslatef(-.5F, -1.5F, .5F);
	GL11.glEnable(GL11.GL_BLEND);
	GL11.glBlendFunc(GL11.GL_SRC_ALPHA, GL11.GL_ONE_MINUS_SRC_ALPHA);
	GL11.glColor4f(1.0F, 1.0F, 1.0F, 1.0F);
	if (container.amount > 0) {
		renderLiquid(container, x, y, z, t);
	}
	bindTexture(modelTexture);
	model.render();

	GL11.glPopMatrix();
}


public void renderLiquid(TileEssentiaContainer entity, double x, double y, double z, float f)
  {
    if (this.tileEntityRenderer.renderEngine == null) {
      return;
    }
    TileEssentiaContainer container = new TileEssentiaContainer();
    GL11.glPushMatrix();
    GL11.glRotatef(180.0F, 1.0F, 0.0F, 0.0F);
    
    World world = entity.worldObj;
    RenderBlocks renderBlocks = new RenderBlocks();
    
    GL11.glDisable(2896);
    
    float level = entity.amount / entity.maxAmount * 0.625F;
    
    Tessellator t = Tessellator.instance;
    
    renderBlocks.setRenderBounds(0.25D, 0.0625D, 0.25D, 0.75D, 0.0625D + level, 0.75D);
    
    t.startDrawingQuads();
    if (entity.aspect != null) {
      t.setColorOpaque_I((entity).aspect.getColor());
    }
    int bright = 200;
    if (entity.worldObj != null) {
      bright = Math.max(200, Block.blocksList[blockIds.idESSENTIA_CONTAINER].getMixedBrightnessForBlock(entity.worldObj, entity.xCoord, entity.yCoord, entity.zCoord));
    }
    t.setBrightness(bright);
    
    Icon icon = ((BlockEssentiaContainer)Block.blocksList[blockIds.idESSENTIA_CONTAINER]).iconLiquid;
    
    this.tileEntityRenderer.renderEngine.bindTexture(modelTexture);

    renderBlocks.renderFaceYNeg(TMBlocks.essentiaContainer, -0.5D, 0.0D, -0.5D, icon);
    renderBlocks.renderFaceYPos(TMBlocks.essentiaContainer, -0.5D, 0.0D, -0.5D, icon);
    renderBlocks.renderFaceZNeg(TMBlocks.essentiaContainer, -0.5D, 0.0D, -0.5D, icon);
    renderBlocks.renderFaceZPos(TMBlocks.essentiaContainer, -0.5D, 0.0D, -0.5D, icon);
    renderBlocks.renderFaceXNeg(TMBlocks.essentiaContainer, -0.5D, 0.0D, -0.5D, icon);
    renderBlocks.renderFaceXPos(TMBlocks.essentiaContainer, -0.5D, 0.0D, -0.5D, icon);
    
    t.draw();
    

    GL11.glEnable(2896);
    GL11.glPopMatrix();
    
    GL11.glColor3f(1.0F, 1.0F, 1.0F);
  }

}

Is TMBlocks.essentiaContainer non-null?

It shouldn't be. It should be an instance of a new block

 

public class TMBlocks {

public static void init() {
	//Block Initialization
	nodeDynamo = new BlockNodeDynamo(BlockIds.idNODE_DYNAMO);
	essentiaContainer = new BlockEssentiaContainer(BlockIds.idESSENTIA_CONTAINER);
	cosmeticOpaque = new BlockCosmeticOpaque(BlockIds.idCOSMETIC_OPAQUE);
	//cosmeticPane = new BlockCosmeticPane(BlockIds.idCOSMETIC_PANE);


	//Registry
	GameRegistry.registerBlock(nodeDynamo, LibNames.NODE_DYNAMO_NAME);
	GameRegistry.registerBlock(essentiaContainer, LibNames.ESSENTIA_CONTAINER_NAME);
	GameRegistry.registerBlock(cosmeticOpaque, LibNames.COSMETIC_OPAQUE_NAME);
	//GameRegistry.registerBlock(cosmeticPane, LibNames.COSMETIC_PANE_NAME);


	//Tiles registry
	GameRegistry.registerTileEntity(TileEssentiaContainer.class, "TileEssentiacontainer");
	GameRegistry.registerTileEntity(TileNodeDynamo.class, "TileNodeDynamo");

}

//Block Instances

public static Block nodeDynamo;
public static Block essentiaContainer;
public static Block cosmeticOpaque;
public static Block cosmeticPane;

}

Make sure.

 

Also take a look at ItemStack.java to see what's going on there.

Try moving the Block instanced above the init() method.

Try moving the Block instanced above the init() method.

 

That is actually irrelevant.

Make sure.

 

Also take a look at ItemStack.java to see what's going on there.

Definitely not null, ItemStack shouldn't be calling null, even the math shouldn't be null. I honestly have no idea here. Any ideas?

"Should not be" is not "is not"