jfjoch_viewer: Orthoscopic perspective to better see grid pattern

viewer/windows/JFJochViewerReciprocalSpaceWindow.cpp

@@ -101,8 +101,14 @@ void ReciprocalSpaceGLView::initializeGL() {
 }
 
 void ReciprocalSpaceGLView::resizeGL(int w, int h) {
+    const float aspect = float(w) / float(h ? h : 1);
+    const float halfHeight = zoom_;
+    const float halfWidth  = halfHeight * aspect;
+
     proj_.setToIdentity();
-    proj_.perspective(45.0f, float(w) / float(h ? h : 1), 0.1f, 10000.0f);
+    proj_.ortho(-halfWidth, halfWidth,
+                -halfHeight, halfHeight,
+                -10000.0f, 10000.0f);
 }
 
 QMatrix4x4 ReciprocalSpaceGLView::currentViewMatrix() const {
@@ -283,6 +289,7 @@ void ReciprocalSpaceGLView::mouseMoveEvent(QMouseEvent *e) {
 void ReciprocalSpaceGLView::wheelEvent(QWheelEvent *e) {
     zoom_ *= (e->angleDelta().y() > 0) ? 0.9f : 1.1f;
     zoom_  = qBound(1.0f, zoom_, 5000.0f);
+    resizeGL(width(), height());
     update();
 }
 
@@ -631,16 +638,6 @@ void JFJochViewerReciprocalSpaceWindow::rebuildGL() {
                             0.0f, 0.0f,
                             0.0f
                         });
-                    } else {
-                       // Faint full reciprocal grid node.
-                        spotVerts.push_back({
-                            node.x * scene_scale_,
-                            node.y * scene_scale_,
-                            node.z * scene_scale_,
-                            pr, pg, pb, 0.5f,
-                            0.0f, 0.0f,
-                            0.0f
-                        });
                     }
                 }
             }