From 59f456a2f2fcd4da47f4641052c9847b1a9cf9d6 Mon Sep 17 00:00:00 2001
From: David Rowe <david@ctrlaltstudio.com>
Date: Mon, 13 Jul 2015 14:16:39 -0700
Subject: [PATCH] Add an "is looking at me" indicator above avatars' heads

Menu item: Developer > Avatar > Show Who's Looking at Me
---
 interface/src/Menu.cpp          |  1 +
 interface/src/Menu.h            |  1 +
 interface/src/avatar/Avatar.cpp | 34 +++++++++++++++++++++++----------
 3 files changed, 26 insertions(+), 10 deletions(-)

diff --git a/interface/src/Menu.cpp b/interface/src/Menu.cpp
index 9f49361f79..d22b80975d 100644
--- a/interface/src/Menu.cpp
+++ b/interface/src/Menu.cpp
@@ -458,6 +458,7 @@ Menu::Menu() {
     addCheckableActionToQMenuAndActionHash(avatarDebugMenu, MenuOption::RenderBoundingCollisionShapes);
     addCheckableActionToQMenuAndActionHash(avatarDebugMenu, MenuOption::RenderLookAtVectors, 0, false);
     addCheckableActionToQMenuAndActionHash(avatarDebugMenu, MenuOption::RenderFocusIndicator, 0, false);
+    addCheckableActionToQMenuAndActionHash(avatarDebugMenu, MenuOption::ShowWhosLookingAtMe, 0, false);
 
     MenuWrapper* handOptionsMenu = developerMenu->addMenu("Hands");
     addCheckableActionToQMenuAndActionHash(handOptionsMenu, MenuOption::AlignForearmsWithWrists, 0, false);
diff --git a/interface/src/Menu.h b/interface/src/Menu.h
index 043bb53a7f..3745f1e766 100644
--- a/interface/src/Menu.h
+++ b/interface/src/Menu.h
@@ -270,6 +270,7 @@ namespace MenuOption {
     const QString ShowBordersEntityNodes = "Show Entity Nodes";
     const QString ShowIKConstraints = "Show IK Constraints";
     const QString ShowRealtimeEntityStats = "Show Realtime Entity Stats";
+    const QString ShowWhosLookingAtMe = "Show Who's Looking at Me";
     const QString SimpleShadows = "Simple";
     const QString SixenseEnabled = "Enable Hydra Support";
     const QString SixenseMouseInput = "Enable Sixense Mouse Input";
diff --git a/interface/src/avatar/Avatar.cpp b/interface/src/avatar/Avatar.cpp
index 0dde96c7ce..d026457457 100644
--- a/interface/src/avatar/Avatar.cpp
+++ b/interface/src/avatar/Avatar.cpp
@@ -453,22 +453,36 @@ void Avatar::render(RenderArgs* renderArgs, const glm::vec3& cameraPosition, boo
             }
         }
 
+        // Stack indicator spheres
+        float indicatorOffset = 0.0f;
+        if (!_displayName.isEmpty() && _displayNameAlpha != 0.0f) {
+            const float DISPLAY_NAME_INDICATOR_OFFSET = 0.22f;
+            indicatorOffset = DISPLAY_NAME_INDICATOR_OFFSET;
+        }
+        const float INDICATOR_RADIUS = 0.03f;
+        const float INDICATOR_INDICATOR_OFFSET = 3.0f * INDICATOR_RADIUS;
+
         // If this is the avatar being looked at, render a little ball above their head
         if (_isLookAtTarget && Menu::getInstance()->isOptionChecked(MenuOption::RenderFocusIndicator)) {
-            const float LOOK_AT_INDICATOR_RADIUS = 0.03f;
-            const float LOOK_AT_INDICATOR_OFFSET = 0.22f;
             const glm::vec4 LOOK_AT_INDICATOR_COLOR = { 0.8f, 0.0f, 0.0f, 0.75f };
-            glm::vec3 position;
-            if (_displayName.isEmpty() || _displayNameAlpha == 0.0f) {
-                position = glm::vec3(_position.x, getDisplayNamePosition().y, _position.z);
-            } else {
-                position = glm::vec3(_position.x, getDisplayNamePosition().y + LOOK_AT_INDICATOR_OFFSET, _position.z);
-            }
+            glm::vec3 position = glm::vec3(_position.x, getDisplayNamePosition().y + indicatorOffset, _position.z);
             Transform transform;
             transform.setTranslation(position);
             batch.setModelTransform(transform);
-            DependencyManager::get<DeferredLightingEffect>()->renderSolidSphere(batch, LOOK_AT_INDICATOR_RADIUS
-                                                                                , 15, 15, LOOK_AT_INDICATOR_COLOR);
+            DependencyManager::get<DeferredLightingEffect>()->renderSolidSphere(batch, INDICATOR_RADIUS,
+                15, 15, LOOK_AT_INDICATOR_COLOR);
+            indicatorOffset += INDICATOR_INDICATOR_OFFSET;
+        }
+
+        // If the avatar is looking at me, render an indication that they area
+        if (getHead()->getIsLookingAtMe() && Menu::getInstance()->isOptionChecked(MenuOption::ShowWhosLookingAtMe)) {
+            const glm::vec4 LOOKING_AT_ME_COLOR = { 0.8f, 0.65f, 0.0f, 0.1f };
+            glm::vec3 position = glm::vec3(_position.x, getDisplayNamePosition().y + indicatorOffset, _position.z);
+            Transform transform;
+            transform.setTranslation(position);
+            batch.setModelTransform(transform);
+            DependencyManager::get<DeferredLightingEffect>()->renderSolidSphere(batch, INDICATOR_RADIUS,
+                15, 15, LOOKING_AT_ME_COLOR);
         }
 
         // quick check before falling into the code below: