Added collision check between ray and box

- Added CheckCollisionRayBox() function.
- Updated and improved core 3d picking example (currently working as
expected).

1 files changed, 11 insertions, 3 deletions

diff --git a/examples/core_3d_picking.c b/examples/core_3d_picking.c
index 2fc05e81..0d6f4ac7 100644
--- a/examples/core_3d_picking.c
+++ b/examples/core_3d_picking.c
@@ -24,9 +24,12 @@ int main()
     Camera camera = {{ 0.0, 10.0, 10.0 }, { 0.0, 0.0, 0.0 }, { 0.0, 1.0, 0.0 }};
 
     Vector3 cubePosition = { 0.0, 1.0, 0.0 };
+    Vector3 cubeSize = { 2.0, 2.0, 2.0 };
     
     Ray ray;        // Picking line ray
     
+    bool collision = false;
+    
     SetCameraMode(CAMERA_FREE);         // Set a free camera mode
     SetCameraPosition(camera.position); // Set internal camera position to match our camera position
 
@@ -45,7 +48,10 @@ int main()
             // NOTE: This function is NOT WORKING properly!
             ray = GetMouseRay(GetMousePosition(), camera);
             
-            // TODO: Check collision between ray and box
+            // Check collision between ray and box
+            collision = CheckCollisionRayBox(ray,
+                (Vector3){cubePosition.x - cubeSize.x / 2,cubePosition.y - cubeSize.y / 2,cubePosition.z - cubeSize.z / 2},
+                (Vector3){cubePosition.x + cubeSize.x / 2,cubePosition.y + cubeSize.y / 2,cubePosition.z + cubeSize.z / 2});
         }
         //----------------------------------------------------------------------------------
 
@@ -57,8 +63,8 @@ int main()
 
             Begin3dMode(camera);
 
-                DrawCube(cubePosition, 2, 2, 2, GRAY);
-                DrawCubeWires(cubePosition, 2, 2, 2, DARKGRAY);
+                DrawCube(cubePosition, cubeSize.x, cubeSize.y, cubeSize.z, GRAY);
+                DrawCubeWires(cubePosition, cubeSize.x, cubeSize.y, cubeSize.z, DARKGRAY);
 
                 DrawGrid(10.0, 1.0);
                 
@@ -67,6 +73,8 @@ int main()
             End3dMode();
             
             DrawText("Try selecting the box with mouse!", 240, 10, 20, GRAY);
+            
+            if(collision) DrawText("BOX SELECTED", (screenWidth - MeasureText("BOX SELECTED", 30)) / 2, screenHeight * 0.1f, 30, GREEN);
 
             DrawFPS(10, 10);