added tutorial 107 for screen capture and texturing

cleaned up the PNG functions Former-commit-id: 7e2a9dc8a2
2016-06-07 23:49:42 -04:00
parent 164943c767
commit 8bc88c1cfc
11 changed files with 275 additions and 7 deletions
@@ -0,0 +1,82 @@
+#include <igl/readOFF.h>
+#include <igl/viewer/Viewer.h>
+#include <iostream>
+#include "tutorial_shared_path.h"
+#include <igl/png/writePNG.h>
+#include <igl/png/readPNG.h>
+
+// This function is called every time a keyboard button is pressed
+bool key_down(igl::viewer::Viewer& viewer, unsigned char key, int modifier)
+{
+  if (key == '1')
+  {
+    // Allocate temporary buffers
+    Eigen::Matrix<unsigned char,Eigen::Dynamic,Eigen::Dynamic> R(1280,800);
+    Eigen::Matrix<unsigned char,Eigen::Dynamic,Eigen::Dynamic> G(1280,800);
+    Eigen::Matrix<unsigned char,Eigen::Dynamic,Eigen::Dynamic> B(1280,800);
+    Eigen::Matrix<unsigned char,Eigen::Dynamic,Eigen::Dynamic> A(1280,800);
+
+    // Draw the scene in the buffers
+    viewer.core.draw_buffer(viewer.data,viewer.opengl,false,R,G,B,A);
+
+    // Save it to a PNG
+    igl::png::writePNG(R,G,B,A,"out.png");
+  }
+
+  if (key == '2')
+  {
+    // Allocate temporary buffers
+    Eigen::Matrix<unsigned char,Eigen::Dynamic,Eigen::Dynamic> R,G,B,A;
+
+    // Read the PNG
+    igl::png::readPNG("out.png",R,G,B,A);
+
+    // Replace the mesh with a triangulated square
+    Eigen::MatrixXd V(4,3);
+    V <<
+      -0.5,-0.5,0,
+       0.5,-0.5,0,
+       0.5, 0.5,0,
+      -0.5, 0.5,0;
+    Eigen::MatrixXi F(2,3);
+    F <<
+      0,1,2,
+      2,3,0;
+    Eigen::MatrixXd UV(4,2);
+    UV <<
+      0,0,
+      1,0,
+      1,1,
+      0,1;
+
+    viewer.data.clear();
+    viewer.data.set_mesh(V,F);
+    viewer.data.set_uv(UV);
+    viewer.core.align_camera_center(V);
+    viewer.core.show_texture = true;
+
+    // Use the image as a texture
+    viewer.data.set_texture(R,G,B);
+
+  }
+
+
+  return false;
+}
+
+int main(int argc, char *argv[])
+{
+  // Load a mesh in OFF format
+  Eigen::MatrixXd V;
+  Eigen::MatrixXi F;
+  igl::readOFF(TUTORIAL_SHARED_PATH "/bunny.off", V, F);
+
+  std::cerr << "Press 1 to render the scene and save it in a png." << std::endl;
+  std::cerr << "Press 2 to load the saved png and use it as a texture." << std::endl;
+
+  // Plot the mesh and register the callback
+  igl::viewer::Viewer viewer;
+  viewer.callback_key_down = &key_down;
+  viewer.data.set_mesh(V, F);
+  viewer.launch();
+}