Dynamically resize lasers so they always end on UI

interface/src/devices/OculusManager.cpp

@@ -490,8 +490,16 @@ void OculusManager::renderLaserPointer() {
 
 glm::vec3 OculusManager::getLaserPointerTipPosition(const PalmData* palm) {
 #ifdef HAVE_LIBOVR
-    const float PALM_TIP_ROD_LENGTH_MULT = 4.0f;
-    return palm->getPosition() + (palm->getTipPosition() - palm->getPosition()) * PALM_TIP_ROD_LENGTH_MULT;
+    const ApplicationOverlay& applicationOverlay = Application::getInstance()->getApplicationOverlay();
+    const float PALM_TIP_ROD_LENGTH_MULT = 40.0f;
+
+    glm::vec3 direction = glm::normalize(palm->getTipPosition() - palm->getPosition());
+    glm::vec3 result;
+    if (applicationOverlay.calculateRayUICollisionPoint(palm->getPosition(), direction, result)) {
+        return result;
+    }
+
+    return palm->getPosition();
 #endif
     return glm::vec3(0.0f);
 }

interface/src/ui/ApplicationOverlay.cpp

@@ -311,6 +311,24 @@ QPoint ApplicationOverlay::getOculusPalmClickLocation(const PalmData *palm) cons
     return rv;
 }
 
+bool ApplicationOverlay::calculateRayUICollisionPoint(const glm::vec3& position, const glm::vec3& direction, glm::vec3& result) const {
+    Application* application = Application::getInstance();
+    MyAvatar* myAvatar = application->getAvatar();
+    
+    glm::quat orientation = myAvatar->getOrientation();
+
+    glm::vec3 relativePosition = orientation * (position - myAvatar->getHead()->calculateAverageEyePosition());
+    glm::vec3 relativeDirection = orientation * direction;
+
+    float t;
+    if (raySphereIntersect(relativeDirection, relativePosition, 1, &t)){
+        result = position + direction * t;
+        return true;
+    }
+
+    return false;
+}
+
 // Draws the FBO texture for Oculus rift.
 void ApplicationOverlay::displayOverlayTextureOculus(Camera& whichCamera) {
 

interface/src/ui/ApplicationOverlay.h

@@ -33,6 +33,7 @@ public:
     void computeOculusPickRay(float x, float y, glm::vec3& direction) const;
     void getClickLocation(int &x, int &y) const;
     QPoint getOculusPalmClickLocation(const PalmData *palm) const;
+    bool calculateRayUICollisionPoint(const glm::vec3& position, const glm::vec3& direction, glm::vec3& result) const;
 
 
     // Getters