add missing redraw request for implicit surfaces

Author: nmwsharp

src/image_quantity_base.cpp

@@ -24,6 +24,8 @@ ImageQuantity::ImageQuantity(Structure& parent_, std::string name_, size_t dimX_
     isShowingCameraBillboard.setPassive(true);
     isShowingImGuiWindow.setPassive(false);
   }
+
+  requestRedraw();
 }
 
 void ImageQuantity::draw() {

src/render_image_quantity_base.cpp

@@ -21,6 +21,8 @@ RenderImageQuantityBase::RenderImageQuantityBase(Structure& parent_, std::string
   if (hasNormals) {
     normals.setTextureSize(dimX, dimY);
   }
+
+  requestRedraw();
 }
 
 size_t RenderImageQuantityBase::nPix() { return dimX * dimY; }