Curved Oculus overlay around camera as a semicircle

examples/flockingBirds.js

@@ -51,7 +51,7 @@ var flockGravity = { x: 0, y: -1, z: 0};
 var enableRandomXZThrust = false; // leading birds randomly decide to thrust in some random direction.
 var enableSomeBirdsLead = false; // birds randomly decide not fly toward flock, causing other birds to follow
 var leaders = 0; // number of birds leading
-var PROBABILITY_TO_LEAD = 0.1; // probabolity a bird will choose to lead
+var PROBABILITY_TO_LEAD = 0.1; // probability a bird will choose to lead
 
 var birds = new Array(); // array of bird state data
 

interface/src/Application.cpp

@@ -1007,6 +1007,12 @@ void Application::keyPressEvent(QKeyEvent* event) {
             case Qt::Key_At:
                 Menu::getInstance()->goTo();
                 break;
+            case Qt::Key_B:
+                _applicationOverlay.setOculusAngle(_applicationOverlay.getOculusAngle() - 1.0f*RADIANS_PER_DEGREE);
+                break;
+            case Qt::Key_N:
+                _applicationOverlay.setOculusAngle(_applicationOverlay.getOculusAngle() + 1.0f*RADIANS_PER_DEGREE);
+                break;
             default:
                 event->ignore();
                 break;

interface/src/devices/OculusManager.cpp

@@ -86,7 +86,7 @@ void OculusManager::display(Camera& whichCamera) {
     // We only need to render the overlays to a texture once, then we just render the texture as a quad
     // PrioVR will only work if renderOverlay is called, calibration is connected to Application::renderingOverlay() 
     applicationOverlay.renderOverlay(true);
-    const bool displayOverlays = false;
+    const bool displayOverlays = true;
     
     Application::getInstance()->getGlowEffect()->prepare(); 
 

interface/src/ui/ApplicationOverlay.cpp

@@ -19,7 +19,8 @@
 
 #include "ui/Stats.h"
 
-ApplicationOverlay::ApplicationOverlay() : _framebufferObject(NULL) {
+ApplicationOverlay::ApplicationOverlay() : _framebufferObject(NULL),
+                                           _oculusAngle(65.0f * RADIANS_PER_DEGREE) {
 
 }
 
@@ -271,14 +272,21 @@ void ApplicationOverlay::displayOverlayTextureOculus(Camera& whichCamera) {
     MyAvatar* myAvatar = application->getAvatar();
     const glm::vec3& viewMatrixTranslation = application->getViewMatrixTranslation();
 
-    // Calculates the world space width and height of the texture based on a desired FOV
-    const float overlayFov = whichCamera.getFieldOfView() * PI / 180.0f;
-    const float overlayDistance = 1;
+    // Get vertical FoV of the displayed overlay texture
+    const float halfVerticalAngle = _oculusAngle / 2.0f;
+    const float overlayDistance = 1.0;
     const float overlayAspectRatio = glWidget->width() / (float)glWidget->height();
-    const float overlayHeight = overlayDistance * tan(overlayFov);
-    const float overlayWidth = overlayHeight * overlayAspectRatio;
-    const float halfOverlayWidth = overlayWidth / 2;
-    const float halfOverlayHeight = overlayHeight / 2;
+    const float halfOverlayHeight = overlayDistance * tan(halfVerticalAngle);
+
+    // The more vertices, the better the curve
+    const int numHorizontalVertices = 20;
+    // U texture coordinate width at each quad
+    const float quadTexWidth = 1.0f / (numHorizontalVertices - 1);
+
+    // Get horizontal angle and angle increment from vertical angle and aspect ratio
+    const float horizontalAngle = halfVerticalAngle * 2.0f * overlayAspectRatio;
+    const float angleIncrement = horizontalAngle / (numHorizontalVertices - 1);
+    const float halfHorizontalAngle = horizontalAngle / 2;
 
     glActiveTexture(GL_TEXTURE0);
 
@@ -305,16 +313,29 @@ void ApplicationOverlay::displayOverlayTextureOculus(Camera& whichCamera) {
     glm::vec3 pos = whichCamera.getPosition();
     glm::quat rot = myAvatar->getOrientation();
     glm::vec3 axis = glm::axis(rot);
-    pos += rot * glm::vec3(0.0, 0.0, -overlayDistance);
-
+   
     glTranslatef(pos.x, pos.y, pos.z);
     glRotatef(glm::degrees(glm::angle(rot)), axis.x, axis.y, axis.z);
+    
+    float leftX, rightX, leftZ, rightZ;
 
     glBegin(GL_QUADS);
-    glTexCoord2f(1, 0); glVertex3f(-halfOverlayWidth, halfOverlayHeight, 0);
-    glTexCoord2f(0, 0); glVertex3f(halfOverlayWidth, halfOverlayHeight, 0);
-    glTexCoord2f(0, 1); glVertex3f(halfOverlayWidth, -halfOverlayHeight, 0);
-    glTexCoord2f(1, 1); glVertex3f(-halfOverlayWidth, -halfOverlayHeight, 0);
+
+    // Place the vertices in a semicircle curve around the camera
+    for (int i = 0; i < numHorizontalVertices-1; i++) {
+
+        // Calculate the X and Z coordinates from the angles and radius from camera
+        leftX = sin(angleIncrement * i - halfHorizontalAngle) * overlayDistance;
+        rightX = sin(angleIncrement * (i + 1) - halfHorizontalAngle) * overlayDistance;
+        leftZ = -cos(angleIncrement * i - halfHorizontalAngle) * overlayDistance;
+        rightZ = -cos(angleIncrement * (i + 1) - halfHorizontalAngle) * overlayDistance;
+
+        glTexCoord2f(quadTexWidth * i, 1); glVertex3f(leftX, halfOverlayHeight, leftZ);
+        glTexCoord2f(quadTexWidth * (i + 1), 1); glVertex3f(rightX,  halfOverlayHeight, rightZ);
+        glTexCoord2f(quadTexWidth * (i + 1), 0); glVertex3f(rightX, -halfOverlayHeight, rightZ);
+        glTexCoord2f(quadTexWidth * i, 0); glVertex3f(leftX, -halfOverlayHeight, leftZ);
+    }
+
     glEnd();
 
     glPopMatrix();

interface/src/ui/ApplicationOverlay.h

@@ -28,11 +28,16 @@ public:
 
     // Getters
     QOpenGLFramebufferObject* getFramebufferObject();
+    float getOculusAngle() const { return _oculusAngle; }
+
+    // Setters
+    void setOculusAngle(float oculusAngle) { _oculusAngle = oculusAngle; }
 
 private:
 
     QOpenGLFramebufferObject* _framebufferObject;
     float _trailingAudioLoudness;
+    float _oculusAngle;
 };
 
 #endif // hifi_ApplicationOverlay_h