New TerrainManager class implemented

core/src/se/cookery/CookeryClient.java

@@ -47,7 +47,6 @@ public class CookeryClient extends SimpleApplication {
 //        cam.lookAt(new Vector3f(0f,0f,0f), Vector3f.UNIT_Z);
 
         flyCam.setEnabled(false);
-//        stateManager.detach(stateManager.getState(FlyCamAppState.class));
         ChaseCamera chaseCam = new ChaseCamera(cam, player.getGfxNode(), inputManager);
         chaseCam.setDefaultDistance(10);
         chaseCam.setRotationSpeed(2);

core/src/se/cookery/gfx/terrain/TerrainHeightMap.java

@@ -0,0 +1,15 @@
+package se.cookery.gfx.terrain;
+
+public interface TerrainHeightMap {
+
+
+    /**
+     * @return the number of squares on the width that make a single TerrainMesh instance.
+     */
+    int getSquareCountWidth();
+
+    /**
+     * @return the number of squares on the height that make a single TerrainMesh instance.
+     */
+    int getSquareCountHeight();
+}

core/src/se/cookery/gfx/terrain/TerrainManager.java

@@ -0,0 +1,81 @@
+package se.cookery.gfx.terrain;
+
+import com.jme3.material.Material;
+import com.jme3.math.ColorRGBA;
+import com.jme3.math.Vector3f;
+import com.jme3.scene.Geometry;
+import com.jme3.scene.Node;
+import se.cookery.gfx.util.MaterialUtil;
+
+/**
+ * This class represents a infinite terrain object (using multiple buffered TerrainMesh objects)
+ */
+public class TerrainManager {
+    protected static final int BUFFER_SIZE = 3;
+
+    private float squareWidth;
+    private float squareHeight;
+    private TerrainHeightMap heightMap;
+
+    private Geometry[][] terrainBuffer;
+    private Vector3f terrainZero; // The top-left coordinate for the center square
+    private Node node = new Node("Terrain Node");
+
+    /**
+     * Create a new instance of TerrainManager
+     *
+     * @param squareWidth  is the width of a single square
+     * @param squareHeight is the height of a single square
+     * @param heightMap    is the height map for the terrain
+     */
+    public TerrainManager(float squareWidth, float squareHeight, TerrainHeightMap heightMap, Material material) {
+        this.squareWidth = squareWidth;
+        this.squareHeight = squareHeight;
+        this.heightMap = heightMap;
+        this.terrainBuffer = new Geometry[BUFFER_SIZE][BUFFER_SIZE];
+
+        for (int x=0; x<BUFFER_SIZE; x++) {
+            for (int z=0; z<BUFFER_SIZE; z++) {
+                TerrainMesh terrainMesh = new TerrainMesh(squareWidth, squareHeight,  heightMap.getSquareCountWidth(), heightMap.getSquareCountHeight());
+                terrainBuffer[x][z] = new Geometry("TerrainMesh " + x + "x" + z, terrainMesh);
+                terrainBuffer[x][z].setMaterial(material);
+                node.attachChild(terrainBuffer[x][z]);
+            }
+        }
+
+        setTerrainCenter(Vector3f.ZERO);
+    }
+
+
+    /**
+     * Method will move the terrain center by reorganizing the buffer
+     * by deallocating out of scope terrain and allocating new terrain that is in scope.
+     */
+    protected void setTerrainCenter(Vector3f newCenter) {
+        Vector3f newTerrainZero = new Vector3f(
+                (int) newCenter.getX()/(squareWidth*heightMap.getSquareCountWidth()),
+                0,
+                (int) newCenter.getZ()/(squareHeight*heightMap.getSquareCountHeight()));
+
+        if (newTerrainZero.equals(terrainZero))
+            return;
+
+        terrainZero = newTerrainZero;
+        int centerIndex = BUFFER_SIZE/2;
+
+        for (int x=0; x<BUFFER_SIZE; x++) {
+            for (int z=0; z<BUFFER_SIZE; z++) {
+                TerrainMesh terrainMesh = (TerrainMesh) terrainBuffer[x][z].getMesh();
+                terrainBuffer[x][z].setLocalTranslation(
+                        terrainZero.getX() + (x - centerIndex) * terrainMesh.getWidth(),
+                        0 ,
+                        terrainZero.getZ() + (z - centerIndex) * terrainMesh.getHeight());
+            }
+        }
+    }
+
+
+    public Node getNode() {
+        return node;
+    }
+}

core/src/se/cookery/gfx/terrain/TerrainMesh.java

@@ -9,24 +9,25 @@ import com.jme3.scene.VertexBuffer;
  */
 public class TerrainMesh extends Mesh {
 
-    private float width;
-    private float height;
-    private int widthCount;
-    private int heightCount;
+    private float squareWidth;
+    private float squareHeight;
+    private int squareCountWidth;
+    private int squareCountHeight;
+
 
     /**
      * Created a terrain Mesh with the given sizes.
      *
-     * @param width         is the width of a single square
-     * @param height        is the height of a single square
-     * @param widthCount    the number of squares that make up the whole terrain
-     * @param heightCount   the number of squares that make up the whole terrain
+     * @param squareWidth  is the width of a single square
+     * @param squareHeight is the height of a single square
+     * @param squareCountWidth the number of squares that make up the whole terrain
+     * @param squareCountHeight the number of squares that make up the whole terrain
      */
-    public TerrainMesh(float width, float height, int widthCount, int heightCount){
-        this.width = width;
-        this.height = height;
-        this.widthCount = widthCount;
-        this.heightCount = heightCount;
+    public TerrainMesh(float squareWidth, float squareHeight, int squareCountWidth, int squareCountHeight){
+        this.squareWidth = squareWidth;
+        this.squareHeight = squareHeight;
+        this.squareCountWidth = squareCountWidth;
+        this.squareCountHeight = squareCountHeight;
 
         updateGeometry();
     }
@@ -45,16 +46,16 @@ public class TerrainMesh extends Mesh {
      * Generates a vertex buffer containing vertex xyz coordinates.
      */
     protected float[] generateVertexBuffer() {
-        int vertexCountWidth = widthCount + 1;
-        int vertexCountHeight = heightCount + 1;
+        int vertexCountWidth = squareCountWidth + 1;
+        int vertexCountHeight = squareCountHeight + 1;
         float[] vertexBuf = new float[3 * vertexCountWidth * vertexCountHeight];
 
         for (int row=0; row<vertexCountHeight; row++) {
             for (int col=0; col<vertexCountWidth; col++) {
                 int vertexIndex = (3 * vertexCountWidth * row) + (3 * col);
-                vertexBuf[vertexIndex + 0] = width * col; // X
+                vertexBuf[vertexIndex + 0] = squareWidth * col; // X
                 vertexBuf[vertexIndex + 1] = 0; // Y
-                vertexBuf[vertexIndex + 2] = height * row; // Z
+                vertexBuf[vertexIndex + 2] = squareHeight * row; // Z
             }
         }
 
@@ -65,17 +66,17 @@ public class TerrainMesh extends Mesh {
      * Generates a index buffer containing planes for the mesh.
      */
     protected short[] generateIndexBuffer() {
-        int vertexCountWidth = widthCount + 1;
-        int triangleCount = widthCount * heightCount * 2;
+        int vertexCountWidth = squareCountWidth + 1;
+        int triangleCount = squareCountWidth * squareCountHeight * 2;
         short[] indexBuf = new short[3 * triangleCount];
 
-        for (int row=0; row<heightCount; row++) {
-            for (int col = 0; col<widthCount; col++) {
+        for (int row = 0; row< squareCountHeight; row++) {
+            for (int col = 0; col< squareCountWidth; col++) {
                 int vertexTopLeft = (row * vertexCountWidth) + col;
                 int vertexTopRight = vertexTopLeft + 1;
                 int vertexBottomLeft = ((row + 1) * vertexCountWidth) + col;
                 int vertexBottomRight = vertexBottomLeft + 1;
-                int indexOffset = 3 * 2 * ((row * widthCount) + col);
+                int indexOffset = 3 * 2 * ((row * squareCountWidth) + col);
 
                 indexBuf[indexOffset + 0] = (short) vertexTopLeft;
                 indexBuf[indexOffset + 1] = (short) vertexBottomLeft;
@@ -114,4 +115,21 @@ public class TerrainMesh extends Mesh {
                 0, 0, 1
         };
     }
+
+
+    public float getWidth() {
+        return squareWidth * squareCountWidth;
+    }
+
+    public float getHeight() {
+        return squareHeight * squareCountHeight;
+    }
+
+    public float getSquareWidth() {
+        return squareWidth;
+    }
+
+    public float getSquareHeight() {
+        return squareHeight;
+    }
 }

core/test/se/cookery/gfx/terrain/TerrainManagerTest.java

@@ -0,0 +1,75 @@
+package se.cookery.gfx.terrain;
+
+import com.jme3.math.Vector3f;
+import com.jme3.scene.Node;
+import com.jme3.scene.Spatial;
+import org.junit.jupiter.api.Test;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+class TerrainManagerTest {
+
+    private static class TerrainHeightMapImpl implements TerrainHeightMap {
+        public int getSquareCountWidth() {
+            return 1;
+        }
+
+        public int getSquareCountHeight() {
+            return 1;
+        }
+    }
+
+    @Test
+    void initialization() {
+        TerrainManager manager = new TerrainManager(1, 1, new TerrainHeightMapImpl(), null);
+        Node node = manager.getNode();
+
+        assertEquals(TerrainManager.BUFFER_SIZE*TerrainManager.BUFFER_SIZE, node.getChildren().size());
+
+        for (int x=0; x<TerrainManager.BUFFER_SIZE; x++) {
+            for (int y=0; y<TerrainManager.BUFFER_SIZE; y++) {
+                assertNotNull(node.getChild("TerrainMesh " + x + "x" + y), "TerrainMesh missing: TerrainMesh " + x + "x" + y);
+            }
+        }
+    }
+
+    @Test
+    void setTerrainCenter() {
+        TerrainManager manager = new TerrainManager(1, 1, new TerrainHeightMapImpl(), null);
+        Node node = manager.getNode();
+
+        assertEquals(new Vector3f(-1, 0, -1), node.getChild("TerrainMesh 0x0").getLocalTranslation());
+        assertEquals(new Vector3f( 0, 0, -1), node.getChild("TerrainMesh 1x0").getLocalTranslation());
+        assertEquals(new Vector3f( 1, 0, -1), node.getChild("TerrainMesh 2x0").getLocalTranslation());
+        assertEquals(new Vector3f(-1, 0,  0), node.getChild("TerrainMesh 0x1").getLocalTranslation());
+        assertEquals(new Vector3f( 0, 0,  0), node.getChild("TerrainMesh 1x1").getLocalTranslation());
+        assertEquals(new Vector3f( 1, 0,  0), node.getChild("TerrainMesh 2x1").getLocalTranslation());
+        assertEquals(new Vector3f(-1, 0,  1), node.getChild("TerrainMesh 0x2").getLocalTranslation());
+        assertEquals(new Vector3f( 0, 0,  1), node.getChild("TerrainMesh 1x2").getLocalTranslation());
+        assertEquals(new Vector3f( 1, 0,  1), node.getChild("TerrainMesh 2x2").getLocalTranslation());
+
+        manager.setTerrainCenter(new Vector3f(10, 0, 10));
+
+        assertEquals(new Vector3f( 9, 0,  9), node.getChild("TerrainMesh 0x0").getLocalTranslation());
+        assertEquals(new Vector3f(10, 0,  9), node.getChild("TerrainMesh 1x0").getLocalTranslation());
+        assertEquals(new Vector3f(11, 0,  9), node.getChild("TerrainMesh 2x0").getLocalTranslation());
+        assertEquals(new Vector3f( 9, 0, 10), node.getChild("TerrainMesh 0x1").getLocalTranslation());
+        assertEquals(new Vector3f(10, 0, 10), node.getChild("TerrainMesh 1x1").getLocalTranslation());
+        assertEquals(new Vector3f(11, 0, 10), node.getChild("TerrainMesh 2x1").getLocalTranslation());
+        assertEquals(new Vector3f( 9, 0, 11), node.getChild("TerrainMesh 0x2").getLocalTranslation());
+        assertEquals(new Vector3f(10, 0, 11), node.getChild("TerrainMesh 1x2").getLocalTranslation());
+        assertEquals(new Vector3f(11, 0, 11), node.getChild("TerrainMesh 2x2").getLocalTranslation());
+
+        manager.setTerrainCenter(new Vector3f(0.1f, 0, 0.1f));
+
+        assertEquals(new Vector3f(-1, 0, -1), node.getChild("TerrainMesh 0x0").getLocalTranslation());
+        assertEquals(new Vector3f( 0, 0, -1), node.getChild("TerrainMesh 1x0").getLocalTranslation());
+        assertEquals(new Vector3f( 1, 0, -1), node.getChild("TerrainMesh 2x0").getLocalTranslation());
+        assertEquals(new Vector3f(-1, 0,  0), node.getChild("TerrainMesh 0x1").getLocalTranslation());
+        assertEquals(new Vector3f( 0, 0,  0), node.getChild("TerrainMesh 1x1").getLocalTranslation());
+        assertEquals(new Vector3f( 1, 0,  0), node.getChild("TerrainMesh 2x1").getLocalTranslation());
+        assertEquals(new Vector3f(-1, 0,  1), node.getChild("TerrainMesh 0x2").getLocalTranslation());
+        assertEquals(new Vector3f( 0, 0,  1), node.getChild("TerrainMesh 1x2").getLocalTranslation());
+        assertEquals(new Vector3f( 1, 0,  1), node.getChild("TerrainMesh 2x2").getLocalTranslation());
+    }
+}