From 4fd8c8ab2e516d3adafbfaf0394d4f0daa8cea8f Mon Sep 17 00:00:00 2001
From: "copilot-swe-agent[bot]" <198982749+Copilot@users.noreply.github.com>
Date: Fri, 27 Mar 2026 19:44:12 +0000
Subject: [PATCH 1/4] Initial plan


From 04b113ddb742f463f969b36e163423378c786557 Mon Sep 17 00:00:00 2001
From: "copilot-swe-agent[bot]" <198982749+Copilot@users.noreply.github.com>
Date: Fri, 27 Mar 2026 19:49:28 +0000
Subject: [PATCH 2/4] Add 'fit to scene' feature to examples/viewer

- Press 'F' key to reset camera to view entire model
- Initial camera position set to fit the scene on load
- Enable centering translation to center objects at origin
- Store bounding box data in globals for FitToScene() access
- Update help text to document 'F' key

Agent-Logs-Url: https://github.com/tinyobjloader/tinyobjloader/sessions/3b05e7bf-a2b5-4b2d-b308-718537dfc75a

Co-authored-by: syoyo <18676+syoyo@users.noreply.github.com>
---
 examples/viewer/viewer.cc | 63 +++++++++++++++++++++++++++++++--------
 1 file changed, 50 insertions(+), 13 deletions(-)

diff --git a/examples/viewer/viewer.cc b/examples/viewer/viewer.cc
index 2e6bd952..24dfec04 100644
--- a/examples/viewer/viewer.cc
+++ b/examples/viewer/viewer.cc
@@ -157,6 +157,10 @@ float g_angleY = 0.0f; // in degree
 bool g_show_wire = true;
 bool g_cull_face = false;
 
+float scene_bmin[3] = {0.0f, 0.0f, 0.0f};
+float scene_bmax[3] = {0.0f, 0.0f, 0.0f};
+float scene_maxExtent = 1.0f;
+
 GLFWwindow* window;
 
 static std::string GetBaseDir(const std::string& filepath) {
@@ -923,6 +927,8 @@ static void reshapeFunc(GLFWwindow* window, int w, int h) {
   height = h;
 }
 
+static void FitToScene();
+
 static void keyboardFunc(GLFWwindow* window, int key, int scancode, int action,
                          int mods) {
   (void)window;
@@ -959,6 +965,11 @@ static void keyboardFunc(GLFWwindow* window, int key, int scancode, int action,
       g_cull_face = !g_cull_face;
     }
 
+    if (key == GLFW_KEY_F) {
+      // fit to scene
+      FitToScene();
+    }
+
     // init_frame = true;
   }
 }
@@ -1104,6 +1115,26 @@ static void Init() {
   up[2] = 0.0f;
 }
 
+// Reset camera to fit the entire scene in view.
+static void FitToScene() {
+  trackball(curr_quat, 0, 0, 0, 0);
+
+  g_angleX = 0.0f;
+  g_angleY = 0.0f;
+
+  eye[0] = 0.0f;
+  eye[1] = 0.0f;
+  eye[2] = 3.0f;
+
+  lookat[0] = 0.0f;
+  lookat[1] = 0.0f;
+  lookat[2] = 0.0f;
+
+  up[0] = 0.0f;
+  up[1] = 1.0f;
+  up[2] = 0.0f;
+}
+
 int main(int argc, char** argv) {
   if (argc < 2) {
     std::cout << "Needs input.obj\n" << std::endl;
@@ -1126,6 +1157,7 @@ int main(int argc, char** argv) {
 
   std::cout << "W : Toggle wireframe\n";
   std::cout << "C : Toggle face culling\n";
+  std::cout << "F : Fit to scene\n";
   //std::cout << "K, J, H, L, P, N : Move camera\n";
   std::cout << "Q, Esc : quit\n";
 
@@ -1154,14 +1186,19 @@ int main(int argc, char** argv) {
     return -1;
   }
 
-  float maxExtent = 0.5f * (bmax[0] - bmin[0]);
-  if (maxExtent < 0.5f * (bmax[1] - bmin[1])) {
-    maxExtent = 0.5f * (bmax[1] - bmin[1]);
+  scene_bmin[0] = bmin[0]; scene_bmin[1] = bmin[1]; scene_bmin[2] = bmin[2];
+  scene_bmax[0] = bmax[0]; scene_bmax[1] = bmax[1]; scene_bmax[2] = bmax[2];
+
+  scene_maxExtent = 0.5f * (bmax[0] - bmin[0]);
+  if (scene_maxExtent < 0.5f * (bmax[1] - bmin[1])) {
+    scene_maxExtent = 0.5f * (bmax[1] - bmin[1]);
   }
-  if (maxExtent < 0.5f * (bmax[2] - bmin[2])) {
-    maxExtent = 0.5f * (bmax[2] - bmin[2]);
+  if (scene_maxExtent < 0.5f * (bmax[2] - bmin[2])) {
+    scene_maxExtent = 0.5f * (bmax[2] - bmin[2]);
   }
 
+  FitToScene();
+
   while (glfwWindowShouldClose(window) == GL_FALSE) {
     glfwPollEvents();
     glClearColor(0.1f, 0.2f, 0.3f, 1.0f);
@@ -1178,9 +1215,9 @@ int main(int argc, char** argv) {
               up[1], up[2]);
 
     float center[3];
-    center[0] = 0.5 * (bmax[0] + bmin[0]);
-    center[1] = 0.5 * (bmax[1] + bmin[1]);
-    center[2] = 0.5 * (bmax[2] + bmin[2]);
+    center[0] = 0.5f * (scene_bmax[0] + scene_bmin[0]);
+    center[1] = 0.5f * (scene_bmax[1] + scene_bmin[1]);
+    center[2] = 0.5f * (scene_bmax[2] + scene_bmin[2]);
     float rotm[4][4];
     turntable(g_angleX, g_angleY, center, rotm);
 
@@ -1188,13 +1225,13 @@ int main(int argc, char** argv) {
     glMultMatrixf(&mat[0][0]);
 
     // Fit to -1, 1
-    glScalef(1.0f / maxExtent, 1.0f / maxExtent, 1.0f / maxExtent);
+    glScalef(1.0f / scene_maxExtent, 1.0f / scene_maxExtent,
+             1.0f / scene_maxExtent);
 
-#if 0
     // Centerize object.
-    glTranslatef(-0.5 * (bmax[0] + bmin[0]), -0.5 * (bmax[1] + bmin[1]),
-                 -0.5 * (bmax[2] + bmin[2]));
-#endif
+    glTranslatef(-0.5f * (scene_bmax[0] + scene_bmin[0]),
+                 -0.5f * (scene_bmax[1] + scene_bmin[1]),
+                 -0.5f * (scene_bmax[2] + scene_bmin[2]));
 
     Draw(gDrawObjects, materials, textures);
 

From 05afe287e3990d51a0d46fd34ef58ac48bf8b4c8 Mon Sep 17 00:00:00 2001
From: "copilot-swe-agent[bot]" <198982749+Copilot@users.noreply.github.com>
Date: Wed, 20 May 2026 17:59:01 +0000
Subject: [PATCH 3/4] Deduplicate camera reset via FitToScene

Agent-Logs-Url: https://github.com/tinyobjloader/tinyobjloader/sessions/bc775a18-3d4d-4633-8094-588a51daab3d

Co-authored-by: syoyo <18676+syoyo@users.noreply.github.com>
---
 examples/viewer/viewer.cc | 16 ++--------------
 1 file changed, 2 insertions(+), 14 deletions(-)

diff --git a/examples/viewer/viewer.cc b/examples/viewer/viewer.cc
index 24dfec04..25b463fb 100644
--- a/examples/viewer/viewer.cc
+++ b/examples/viewer/viewer.cc
@@ -1099,21 +1099,9 @@ static void Draw(const std::vector<DrawObject>& drawObjects,
   }
 }
 
-static void Init() {
-  trackball(curr_quat, 0, 0, 0, 0);
-
-  eye[0] = 0.0f;
-  eye[1] = 0.0f;
-  eye[2] = 3.0f;
-
-  lookat[0] = 0.0f;
-  lookat[1] = 0.0f;
-  lookat[2] = 0.0f;
+static void FitToScene();
 
-  up[0] = 0.0f;
-  up[1] = 1.0f;
-  up[2] = 0.0f;
-}
+static void Init() { FitToScene(); }
 
 // Reset camera to fit the entire scene in view.
 static void FitToScene() {

From 98840c2b0df2c6a3fa5ec9bbc7cb3299abbe0043 Mon Sep 17 00:00:00 2001
From: "copilot-swe-agent[bot]" <198982749+Copilot@users.noreply.github.com>
Date: Wed, 20 May 2026 17:59:53 +0000
Subject: [PATCH 4/4] Remove duplicate FitToScene declaration

Agent-Logs-Url: https://github.com/tinyobjloader/tinyobjloader/sessions/bc775a18-3d4d-4633-8094-588a51daab3d

Co-authored-by: syoyo <18676+syoyo@users.noreply.github.com>
---
 examples/viewer/viewer.cc | 2 --
 1 file changed, 2 deletions(-)

diff --git a/examples/viewer/viewer.cc b/examples/viewer/viewer.cc
index 25b463fb..5d236854 100644
--- a/examples/viewer/viewer.cc
+++ b/examples/viewer/viewer.cc
@@ -1099,8 +1099,6 @@ static void Draw(const std::vector<DrawObject>& drawObjects,
   }
 }
 
-static void FitToScene();
-
 static void Init() { FitToScene(); }
 
 // Reset camera to fit the entire scene in view.