From 3b998a1f250157fb64eb8dd45f1938c99cd1c3a5 Mon Sep 17 00:00:00 2001
From: David Coeurjolly <david.coeurjolly@liris.cnrs.fr>
Date: Tue, 1 Mar 2022 14:29:22 +0100
Subject: [PATCH] anim

---
 4-LaplacianSmoothing/c++/displayOBJ.cpp | 33 ++++++++++++++++++++++++-
 1 file changed, 32 insertions(+), 1 deletion(-)

diff --git a/4-LaplacianSmoothing/c++/displayOBJ.cpp b/4-LaplacianSmoothing/c++/displayOBJ.cpp
index c998578..fa8c9e5 100644
--- a/4-LaplacianSmoothing/c++/displayOBJ.cpp
+++ b/4-LaplacianSmoothing/c++/displayOBJ.cpp
@@ -13,6 +13,32 @@ using namespace geometrycentral::surface;
 std::unique_ptr<ManifoldSurfaceMesh> mesh;
 std::unique_ptr<VertexPositionGeometry> geometry;
 
+int counter=0;
+
+void oneStep()
+{
+  for(size_t i = 0; i < mesh->nVertices(); ++i)
+    geometry->vertexPositions[i] = geometry->vertexPositions[i] + Vector3::constant(0.01*sin(i*counter/(2.0*M_PI)));
+}
+
+bool go=false;
+
+void myCallback()
+{
+  if (ImGui::Button("Go!"))
+    go= !go;
+  
+  if (go)
+  {
+    oneStep();
+    polyscope::getSurfaceMesh("Input obj")->updateVertexPositions(geometry->vertexPositions);
+   // polyscope::screenshot();
+  }
+  counter++;
+}
+
+
+
 int main(int argc, char **argv) {
 
   // Initialize polyscope
@@ -27,8 +53,13 @@ int main(int argc, char **argv) {
                                  mesh->getFaceVertexList(),
                                  polyscopePermutations(*mesh));
   
+  
+  geometry->requireVertexPositions();
+ 
+  // Specify the callback
+  polyscope::state::userCallback = myCallback;
+  
   // Give control to the polyscope gui
   polyscope::show();
-
   return EXIT_SUCCESS;
 }