private void setUpTerrainMaterial(AssetManager assetManager) {
                // PBR terrain matdef
                matTerrain = new Material(assetManager, "Common/MatDefs/Terrain/PBRTerrain.j3md");

                matTerrain.setBoolean("useTriPlanarMapping", false);

                // ALPHA map (for splat textures)
                matTerrain.setTexture("AlphaMap", assetManager.loadTexture("Textures/Terrain/splat/alpha1.png"));
                matTerrain.setTexture("AlphaMap_1", assetManager.loadTexture("Textures/Terrain/splat/alpha2.png"));

                // DIRT texture
                Texture dirt = assetManager.loadTexture("Textures/Terrain/PBR/Ground037_1K_Color.png");
                dirt.setWrap(WrapMode.Repeat);
                matTerrain.setTexture("AlbedoMap_0", dirt);
                matTerrain.setFloat("AlbedoMap_0_scale", dirtScale);
                matTerrain.setFloat("Roughness_0", 1);
                matTerrain.setFloat("Metallic_0", 0);

                // DARK ROCK texture
                Texture darkRock = assetManager.loadTexture("Textures/Terrain/PBR/Rock035_1K_Color.png");
                darkRock.setWrap(WrapMode.Repeat);
                matTerrain.setTexture("AlbedoMap_1", darkRock);
                matTerrain.setFloat("AlbedoMap_1_scale", darkRockScale);
                matTerrain.setFloat("Roughness_1", 0.92f);
                matTerrain.setFloat("Metallic_1", 0.02f);

                // SNOW texture
                Texture snow = assetManager.loadTexture("Textures/Terrain/PBR/Snow006_1K_Color.png");
                snow.setWrap(WrapMode.Repeat);
                matTerrain.setTexture("AlbedoMap_2", snow);
                matTerrain.setFloat("AlbedoMap_2_scale", snowScale);
                matTerrain.setFloat("Roughness_2", 0.55f);
                matTerrain.setFloat("Metallic_2", 0.12f);

                // TILES texture
                Texture tiles = assetManager.loadTexture("Textures/Terrain/PBR/Tiles083_1K_Color.png");
                tiles.setWrap(WrapMode.Repeat);
                matTerrain.setTexture("AlbedoMap_3", tiles);
                matTerrain.setFloat("AlbedoMap_3_scale", tileRoadScale);
                matTerrain.setFloat("Roughness_3", 0.87f);
                matTerrain.setFloat("Metallic_3", 0.08f);

                // GRASS texture
                Texture grass = assetManager.loadTexture("Textures/Terrain/PBR/Ground037_1K_Color.png");
                grass.setWrap(WrapMode.Repeat);
                matTerrain.setTexture("AlbedoMap_4", grass);
                matTerrain.setFloat("AlbedoMap_4_scale", grassScale);
                matTerrain.setFloat("Roughness_4", 1);
                matTerrain.setFloat("Metallic_4", 0);

                // MARBLE texture
                Texture marble = assetManager.loadTexture("Textures/Terrain/PBR/Marble013_1K_Color.png");
                marble.setWrap(WrapMode.Repeat);
                matTerrain.setTexture("AlbedoMap_5", marble);
                matTerrain.setFloat("AlbedoMap_5_scale", marbleScale);
                matTerrain.setFloat("Roughness_5", 0.06f);
                matTerrain.setFloat("Metallic_5", 0.8f);

                // Gravel texture
                Texture gravel = assetManager.loadTexture("Textures/Terrain/PBR/Gravel015_1K_Color.png");
                gravel.setWrap(WrapMode.Repeat);
                matTerrain.setTexture("AlbedoMap_6", gravel);
                matTerrain.setFloat("AlbedoMap_6_scale", gravelScale);
                matTerrain.setFloat("Roughness_6", 0.9f);
                matTerrain.setFloat("Metallic_6", 0.07f);

                // NORMAL MAPS
                Texture normalMapDirt = assetManager.loadTexture("Textures/Terrain/PBR/Ground036_1K_Normal.png");
                normalMapDirt.setWrap(WrapMode.Repeat);

                Texture normalMapDarkRock = assetManager.loadTexture("Textures/Terrain/PBR/Rock035_1K_Normal.png");
                normalMapDarkRock.setWrap(WrapMode.Repeat);

                Texture normalMapSnow = assetManager.loadTexture("Textures/Terrain/PBR/Snow006_1K_Normal.png");
                normalMapSnow.setWrap(WrapMode.Repeat);

                Texture normalMapGravel = assetManager.loadTexture("Textures/Terrain/PBR/Gravel015_1K_Normal.png");
                normalMapGravel.setWrap(WrapMode.Repeat);

                Texture normalMapGrass = assetManager.loadTexture("Textures/Terrain/PBR/Ground037_1K_Normal.png");
                normalMapGrass.setWrap(WrapMode.Repeat);

                Texture normalMapTiles = assetManager.loadTexture("Textures/Terrain/PBR/Tiles083_1K_Normal.png");
                normalMapTiles.setWrap(WrapMode.Repeat);

                matTerrain.setTexture("NormalMap_0", normalMapDirt);
                matTerrain.setTexture("NormalMap_1", normalMapDarkRock);
                matTerrain.setTexture("NormalMap_2", normalMapSnow);
                matTerrain.setTexture("NormalMap_3", normalMapTiles);
                matTerrain.setTexture("NormalMap_4", normalMapGrass);
                matTerrain.setTexture("NormalMap_6", normalMapGravel);

                terrain.setMaterial(matTerrain);
            }
Test PBR terrain with different debug modes

@param testName The name of the test (used for screenshot filename)
@param debugMode The debug mode to use
jme3-screenshot-tests/src/test/java/org/jmonkeyengine/screenshottests/terrain/TestPBRTerrain.java