How can I create a TileEntity Special Renderer in Java using Minecraft Forge 1.12.2?
To create a TileEntity Special Renderer (TESR) in Minecraft Forge 1.12.2, follow these steps:

1. Create a new class that extends TileEntitySpecialRenderer.
2. Override the render method in the new class. This method will be called every time the TESR needs to render a TileEntity.
3. In the render method, set up the OpenGL state and perform any necessary transformations.
4. Use the Tessellator class to create a 3D mesh and render it using the appropriate rendering methods.
5. Clean up the OpenGL state and finish the render method.

Here is a sample code that demonstrates these steps:
```java
import net.minecraft.client.renderer.Tessellator;
import net.minecraft.client.renderer.tileentity.TileEntitySpecialRenderer;
import net.minecraft.tileentity.TileEntity;

public class ExampleTESR extends TileEntitySpecialRenderer {

    @Override
    public void render(TileEntity te, double x, double y, double z, float partialTicks, int destroyStage, float alpha) {
        Tessellator tessellator = Tessellator.getInstance();
        // Set up the OpenGL state and perform transformations here...
        // Render the 3D mesh using the Tessellator class...
        // Clean up the OpenGL state here...
    }
}
```

Once the TESR class has been created, it needs to be registered with Minecraft. To do this, create a new class that extends ClientRegistry and register the TESR using the register method. Here is an example of this step:
```java
import net.minecraftforge.fml.client.registry.ClientRegistry;

public class ExampleMod {
    public static void init() {
        ClientRegistry.bindTileEntitySpecialRenderer(ExampleTileEntity.class, new ExampleTESR());
    }
}
```

With these steps, a TESR has been created and registered in Minecraft Forge 1.12.2. The code will be specific to the TileEntity being rendered, so it may need to be adjusted to fit the specific use case.
Can you combine that code into single block?
Sure, but note that the code from the two blocks shoud go into two different files. The delineation between the files is highlighted using code comments as // Filename.java indicating the start of a new file.
```java
// ExampleTESR.java
import net.minecraft.client.renderer.Tessellator;
import net.minecraft.client.renderer.tileentity.TileEntitySpecialRenderer;
import net.minecraft.tileentity.TileEntity;

public class ExampleTESR extends TileEntitySpecialRenderer {

    @Override
    public void render(TileEntity te, double x, double y, double z, float partialTicks, int destroyStage, float alpha) {
        Tessellator tessellator = Tessellator.getInstance();
        // Set up the OpenGL state and perform transformations here...
        // Render the 3D mesh using the Tessellator class...
        // Clean up the OpenGL state here...
    }
}

// ExampleMod.java
import net.minecraftforge.fml.client.registry.ClientRegistry;

public class ExampleMod {
    public static void init() {
        ClientRegistry.bindTileEntitySpecialRenderer(ExampleTileEntity.class, new ExampleTESR());
    }
}
```