Add getCorners to ViewFrustum

libraries/octree/src/ViewFrustum.cpp

@@ -736,6 +736,23 @@ void ViewFrustum::getFurthestPointFromCamera(const AACube& box, glm::vec3& furth
     }
 }
 
+const ViewFrustum::Corners ViewFrustum::getCorners(const float& depth) {
+    glm::vec3 normal = glm::normalize(_direction);
+
+    auto getCorner = [&](enum::BoxVertex nearCorner, enum::BoxVertex farCorner) {
+        const auto dir = glm::normalize(_cornersWorld[nearCorner] - _cornersWorld[farCorner]);
+        const auto factor = depth / glm::dot(dir, normal);
+        return _position + factor * dir;
+    };
+
+    return Corners{
+        getCorner(TOP_LEFT_NEAR, TOP_LEFT_FAR),
+        getCorner(TOP_RIGHT_NEAR, TOP_RIGHT_FAR),
+        getCorner(BOTTOM_LEFT_NEAR, BOTTOM_LEFT_FAR),
+        getCorner(BOTTOM_RIGHT_NEAR, BOTTOM_RIGHT_FAR)
+    };
+}
+
 float ViewFrustum::distanceToCamera(const glm::vec3& point) const {
     glm::vec3 temp = getPosition() - point;
     float distanceToPoint = sqrtf(glm::dot(temp, temp));

libraries/octree/src/ViewFrustum.h

@@ -61,11 +61,22 @@ public:
     float getFarClip() const { return _farClip; }
     float getFocalLength() const { return _focalLength; }
 
+    const class Corners{
+    public:
+        Corners(glm::vec3&& topLeft, glm::vec3&& topRight, glm::vec3&& bottomLeft, glm::vec3&& bottomRight)
+            : topLeft{ topLeft }, topRight{ topRight }, bottomLeft{ bottomLeft }, bottomRight{ bottomRight } {}
+        glm::vec3 topLeft;
+        glm::vec3 topRight;
+        glm::vec3 bottomLeft;
+        glm::vec3 bottomRight;
+    // Get the corners depth units from frustum position, along frustum orientation
+    } getCorners(const float& depth);
+
+    // getters for corners
     const glm::vec3& getFarTopLeft() const { return _cornersWorld[TOP_LEFT_FAR]; }
     const glm::vec3& getFarTopRight() const { return _cornersWorld[TOP_RIGHT_FAR]; }
     const glm::vec3& getFarBottomLeft() const { return _cornersWorld[BOTTOM_LEFT_FAR]; }
     const glm::vec3& getFarBottomRight() const { return _cornersWorld[BOTTOM_RIGHT_FAR]; }
-
     const glm::vec3& getNearTopLeft() const { return _cornersWorld[TOP_LEFT_NEAR]; }
     const glm::vec3& getNearTopRight() const { return _cornersWorld[TOP_RIGHT_NEAR]; }
     const glm::vec3& getNearBottomLeft() const { return _cornersWorld[BOTTOM_LEFT_NEAR]; }