Updated Mousepicker

client/src/main/java/core/engine/Engine.java

@@ -135,10 +135,15 @@ public class Engine {
         // Run the rendering loop until the user has attempted to close
         // the window or has pressed the ESCAPE key.
         MasterRenderer renderer = new MasterRenderer();
-        MousePicker mousePicker = new MousePicker(camera, renderer.getProjectionMatrix());
+        MousePicker mousePicker = new MousePicker(camera, renderer.getProjectionMatrix(), terrain);
         input(camera, renderer, mousePicker);
         while ( !glfwWindowShouldClose(window) ) {
+            DoubleBuffer posX = BufferUtils.createDoubleBuffer(1);
+            DoubleBuffer posY = BufferUtils.createDoubleBuffer(1);
+            glfwGetCursorPos(window, posX, posY);
+            mousePicker.update((float) posX.get(0), (float) posY.get(0));
             renderer.processTerrain(terrain);
+
             //renderer.processEntity(hexagonEntity);
             renderer.render(light, camera);
             glfwSwapBuffers(window); // swap the color buffers

client/src/main/java/core/engine/terrain/Terrain.java

@@ -1,6 +1,7 @@
 package core.engine.terrain;
 
 import core.engine.Loader;
+import core.engine.entity.Camera;
 import core.engine.model.HexagonModel;
 import core.engine.model.RawModel;
 import core.engine.model.TexturedModel;
@@ -33,8 +34,6 @@ public class Terrain {
         }
     }
 
-
-
     public List<TerrainTile> getTerrainTiles() {
         return terrainTiles;
     }

client/src/main/java/core/engine/terrain/TerrainTile.java

@@ -1,6 +1,7 @@
 package core.engine.terrain;
 
 import core.engine.Loader;
+import core.engine.entity.Camera;
 import core.engine.model.RawModel;
 import core.engine.model.TexturedModel;
 import core.engine.textures.ModelTexture;

client/src/main/java/core/engine/toolbox/MousePicker.java

@@ -2,24 +2,34 @@ package core.engine.toolbox;
 
 import core.engine.Engine;
 import core.engine.entity.Camera;
+import core.engine.terrain.Terrain;
 import org.lwjgl.system.windows.MOUSEINPUT;
 import utils.MatrixGraphicUtils;
-import utils.vectors.Matrix4f;
+import utils.vectors.*;
-import utils.vectors.Vector2f;
-import utils.vectors.Vector3f;
-import utils.vectors.Vector4f;
 
 public class MousePicker {
 
-    private Vector3f currentRay;
+    private static final int RECURSION_COUNT = 200;
+    private static final float RAY_RANGE = 600;
+
+    private Vector3f currentRay = new Vector3f();
+
     private Matrix4f projectionMatrix;
     private Matrix4f viewMatrix;
     private Camera camera;
 
-    public MousePicker(Camera camera, Matrix4f projectionMatrix) {
+    private Terrain terrain;
-        this.camera = camera;
+    private Vector3f currentTerrainPoint;
-        this.projectionMatrix = projectionMatrix;
+
-        this.viewMatrix = MatrixGraphicUtils.createViewMatrix(camera);
+    public MousePicker(Camera cam, Matrix4f projection, Terrain terrain) {
+        camera = cam;
+        projectionMatrix = projection;
+        viewMatrix = MatrixGraphicUtils.createViewMatrix(camera);
+        this.terrain = terrain;
+    }
+
+    public Vector3f getCurrentTerrainPoint() {
+        return currentTerrainPoint;
     }
 
     public Vector3f getCurrentRay() {
@@ -27,34 +37,93 @@ public class MousePicker {
     }
 
     public void update(float mouseX, float mouseY) {
-        this.viewMatrix = MatrixGraphicUtils.createViewMatrix(camera);
+        viewMatrix = MatrixGraphicUtils.createViewMatrix(camera);
-        this.currentRay = calculateMouseRay(mouseX, mouseY);
+        currentRay = calculateMouseRay(mouseX, mouseY);
+        if (intersectionInRange(0, RAY_RANGE, currentRay)) {
+            currentTerrainPoint = binarySearch(0, 0, RAY_RANGE, currentRay);
+        } else {
+            currentTerrainPoint = null;
+        }
     }
 
-    public Vector3f calculateMouseRay(float mouseX, float mouseY) {
+    private Vector3f calculateMouseRay(float mouseX, float mouseY) {
-        Vector2f normalizedDeviceCoords = getNormalizedDeviceCoords(mouseX, mouseY);
+
-        Vector4f clipCoords = new Vector4f(normalizedDeviceCoords.x, normalizedDeviceCoords.y, -1f, 1f);
+        Vector2f normalizedCoords = getNormalisedDeviceCoordinates(mouseX, mouseY);
+        Vector4f clipCoords = new Vector4f(normalizedCoords.x, normalizedCoords.y, -1.0f, 1.0f);
         Vector4f eyeCoords = toEyeCoords(clipCoords);
-        return toWorldCoords(eyeCoords);
+        Vector3f worldRay = toWorldCoords(eyeCoords);
-    }
+        System.out.println(worldRay);
-
+        return worldRay;
-    private Vector2f getNormalizedDeviceCoords(float mouseX, float mouseY) {
-        float x = (2f* mouseX) / Engine.WINDOW_WIDTH -1;
-        float y = (2f * mouseY) / Engine.WINDOW_HEIGHT -1;
-        return new Vector2f(x, y);
-    }
-
-    private Vector4f toEyeCoords(Vector4f clipCoords) {
-        Matrix4f invertedProjectionMatrix = Matrix4f.invert(projectionMatrix, null);
-        Vector4f eyeCoords = Matrix4f.transform(invertedProjectionMatrix, clipCoords, null);
-        return new Vector4f(eyeCoords.x, eyeCoords.y, -1f, 0f);
     }
 
     private Vector3f toWorldCoords(Vector4f eyeCoords) {
-        Matrix4f invertedViewMatrix = Matrix4f.invert(viewMatrix, null);
+        Matrix4f invertedView = Matrix4f.invert(viewMatrix, null);
-        Vector4f rayWorld = Matrix4f.transform(invertedViewMatrix, eyeCoords, null);
+        Vector4f rayWorld = Matrix4f.transform(invertedView, eyeCoords, null);
-        Vector3f worldCoords =  new Vector3f(rayWorld.x, rayWorld.y, rayWorld.z);
+        Vector3f mouseRay = new Vector3f(rayWorld.x, rayWorld.y, rayWorld.z);
-        worldCoords.normalise();
+        mouseRay.normalise();
-        return worldCoords;
+        return mouseRay;
+    }
+
+    private Vector4f toEyeCoords(Vector4f clipCoords) {
+        Matrix4f invertedProjection = Matrix4f.invert(projectionMatrix, null);
+        Vector4f eyeCoords = Matrix4f.transform(invertedProjection, clipCoords, null);
+        return new Vector4f(eyeCoords.x, eyeCoords.y, -1f, 0f);
+    }
+
+    private Vector2f getNormalisedDeviceCoordinates(float mouseX, float mouseY) {
+        float x = (2.0f * mouseX) / Engine.WINDOW_WIDTH - 1f;
+        float y = (2.0f * mouseY) / Engine.WINDOW_HEIGHT - 1f;
+        return new Vector2f(x, y);
+    }
+
+    //**********************************************************
+
+    private Vector3f getPointOnRay(Vector3f ray, float distance) {
+        Vector3f camPos = camera.getPosition();
+        Vector3f start = new Vector3f(camPos.x, camPos.y, camPos.z);
+        Vector3f scaledRay = new Vector3f(ray.x * distance, ray.y * distance, ray.z * distance);
+        return Vector3f.add(start, scaledRay, null);
+    }
+
+    private Vector3f binarySearch(int count, float start, float finish, Vector3f ray) {
+        float half = start + ((finish - start) / 2f);
+        if (count >= RECURSION_COUNT) {
+            Vector3f endPoint = getPointOnRay(ray, half);
+            Terrain terrain = getTerrain(endPoint.getX(), endPoint.getZ());
+            if (terrain != null) {
+                return endPoint;
+            } else {
+                return null;
+            }
+        }
+        if (intersectionInRange(start, half, ray)) {
+            return binarySearch(count + 1, start, half, ray);
+        } else {
+            return binarySearch(count + 1, half, finish, ray);
+        }
+    }
+
+    private boolean intersectionInRange(float start, float finish, Vector3f ray) {
+        Vector3f startPoint = getPointOnRay(ray, start);
+        Vector3f endPoint = getPointOnRay(ray, finish);
+        if (!isUnderGround(startPoint) && isUnderGround(endPoint)) {
+            return true;
+        } else {
+            return false;
+        }
+    }
+
+    private boolean isUnderGround(Vector3f testPoint) {
+        Terrain terrain = getTerrain(testPoint.getX(), testPoint.getZ());
+        float height = 0;
+        if (testPoint.y < height) {
+            return true;
+        } else {
+            return false;
+        }
+    }
+
+    private Terrain getTerrain(float worldX, float worldZ) {
+        return terrain;
     }
 }