add render() overloads allowing custom shader and/or lights

src/com/blarg/gdx/tilemap3d/TileMapRenderer.java

@@ -2,16 +2,42 @@ package com.blarg.gdx.tilemap3d;
 
 import com.badlogic.gdx.graphics.Camera;
 import com.badlogic.gdx.graphics.g3d.ModelBatch;
+import com.badlogic.gdx.graphics.g3d.Shader;
+import com.badlogic.gdx.graphics.g3d.lights.Lights;
 
 public class TileMapRenderer {
 	public void render(ModelBatch modelBatch, TileMap tileMap, Camera camera) {
+		render(modelBatch, tileMap, camera, null, null);
+	}
+
+	public void render(ModelBatch modelBatch, TileMap tileMap, Camera camera, Shader shader) {
+		render(modelBatch, tileMap, camera, shader, null);
+	}
+
+	public void render(ModelBatch modelBatch, TileMap tileMap, Camera camera, Lights lights) {
+		render(modelBatch, tileMap, camera, null, lights);
+	}
+
+	public void render(ModelBatch modelBatch, TileMap tileMap, Camera camera, Shader shader, Lights lights) {
 		TileChunk[] chunks = tileMap.chunks;
 		for (int i = 0; i < chunks.length; ++i)
-			render(modelBatch, chunks[i], camera);
+			render(modelBatch, chunks[i], camera, shader, lights);
 	}
 
 	public void render(ModelBatch modelBatch, TileChunk chunk, Camera camera) {
+		render(modelBatch, chunk, camera, null, null);
+	}
+
+	public void render(ModelBatch modelBatch, TileChunk chunk, Camera camera, Shader shader) {
+		render(modelBatch, chunk, camera, shader, null);
+	}
+
+	public void render(ModelBatch modelBatch, TileChunk chunk, Camera camera, Lights lights) {
+		render(modelBatch, chunk, camera, null, lights);
+	}
+
+	public void render(ModelBatch modelBatch, TileChunk chunk, Camera camera, Shader shader, Lights lights) {
 		if (camera.frustum.boundsInFrustum(chunk.getMeshBounds()))
-			modelBatch.render(chunk);
+			modelBatch.render(chunk, lights, shader);
 	}
 }