добавлено дерево, вокруг него теперь крутятся снеговики.

lab2/res/christmas-tree.mtl

@@ -0,0 +1,52 @@
+# Blender MTL File: 'christmas-tree.blend'
+# Material Count: 5
+
+newmtl Balls-1
+Ns 250.000000
+Ka 1.000000 1.000000 1.000000
+Kd 0.800000 0.048409 0.471644
+Ks 0.500000 0.500000 0.500000
+Ke 0.000000 0.000000 0.000000
+Ni 1.450000
+d 1.000000
+illum 2
+
+newmtl Balls-2
+Ns 250.000000
+Ka 1.000000 1.000000 1.000000
+Kd 0.000000 0.032897 0.800000
+Ks 0.500000 0.500000 0.500000
+Ke 0.000000 0.000000 0.000000
+Ni 1.450000
+d 1.000000
+illum 2
+
+newmtl Green
+Ns 250.000000
+Ka 1.000000 1.000000 1.000000
+Kd 0.055518 0.308912 0.004670
+Ks 0.500000 0.500000 0.500000
+Ke 0.000000 0.000000 0.000000
+Ni 1.450000
+d 1.000000
+illum 2
+
+newmtl TopFigure
+Ns 250.000000
+Ka 1.000000 1.000000 1.000000
+Kd 1.000000 0.859637 0.000000
+Ks 0.500000 0.500000 0.500000
+Ke 0.000000 0.000000 0.000000
+Ni 1.450000
+d 1.000000
+illum 2
+
+newmtl Trunc
+Ns 250.000000
+Ka 1.000000 1.000000 1.000000
+Kd 0.206980 0.078561 0.032670
+Ks 0.500000 0.500000 0.500000
+Ke 0.000000 0.000000 0.000000
+Ni 1.450000
+d 1.000000
+illum 2

lab2/src/graphics/MeshLoader.cpp

@@ -24,6 +24,10 @@ struct Material {
 
 static void loadMaterials(std::vector<Material>& materials, const std::string &filename) {
     std::ifstream file(filename, std::ios::in);
+    if (!file.is_open()) {
+        std::cout << "[MeshLoader] Warming: failed to open material file \"" << filename << "\"" << std::endl;
+        return;
+    }
 
     std::string line;
     std::string mtl_name;
@@ -56,6 +60,11 @@ Mesh *MeshLoader::loadMesh(const std::string &filename) {
 
     std::ifstream file(filename + ".obj", std::ios::in);
 
+    if (!file.is_open()) {
+        std::cout << "[MeshLoader] Error: failed to open model file \"" << filename << ".obj\"" << std::endl;
+        return nullptr;
+    }
+
     int line_number = 1;
     glm::vec3 color(0.5f, 0.0f, 1.0f); // дефолтный цвет
     std::string source;

lab2/src/render.cpp

@@ -10,23 +10,44 @@
 
 static Mesh* mesh_xyz;
 static Mesh* mesh_snowman;
+static Mesh* mesh_three;
 
 static Shader* shader;
 
 
-static void drawSnowman() {
+static void drawStaticSnowman() {
     auto model_scale = glm::scale(glm::mat4(1.0f), glm::vec3(0.5f, 0.5f, 0.5f));
-
-    static float angle = 0.0f;
-
     auto model_translate = glm::translate(glm::mat4(1.0f), glm::vec3(3, 2, 5));
-    auto model_rotate = glm::rotate(glm::mat4(1.0f), angle, glm::vec3(0, 1, 0));
-    angle += 0.0002f;
+    auto model_rotate = glm::rotate(glm::mat4(1.0f), glm::radians(45.0f), glm::vec3(1, 1, 1));
 
     shader->uniformMatrix("model", model_scale * model_translate * model_rotate);
     mesh_snowman->draw();
 }
 
+static void drawThree() {
+    // "базовая" матрица
+    auto tree_translate = glm::translate(glm::mat4(1.0f), glm::vec3(5, 0, -5));
+    shader->uniformMatrix("model", tree_translate);
+
+    mesh_three->draw();
+
+    // рисуем снеговиков вокруг дерева
+    static float rotation_angle = 0.0f;
+
+    auto showman_translate = glm::translate(glm::mat4(1.0f), glm::vec3(0, 0, -3));
+
+    for (int i = 0; i < 6; i++) {
+        float offset_angle = glm::radians(60.0f * (float)i);
+        auto showman_rotate = glm::rotate(glm::mat4(1.0f), rotation_angle + offset_angle, glm::vec3(0, 1, 0));
+
+        shader->uniformMatrix("model", tree_translate * showman_rotate * showman_translate);
+
+        mesh_snowman->draw();
+    }
+
+    rotation_angle += 0.0002f;
+}
+
 
 void renderScene(Camera& cam) {
     auto projview = cam.getProjection() * cam.getView();
@@ -37,17 +58,26 @@ void renderScene(Camera& cam) {
     shader->uniformMatrix("model", glm::mat4(1.0f));
     mesh_xyz->draw();
 
-    drawSnowman();
+    drawStaticSnowman();
+    drawThree();
 }
 
 int loadResources() {
     mesh_xyz = MeshLoader::loadMesh("res/xyz");
     if (mesh_xyz == nullptr) {
+        std::cerr << "Failed to load 'xyz' mesh!" << std::endl;
         return -1;
     }
 
     mesh_snowman = MeshLoader::loadMesh("res/snowman");
     if (mesh_snowman == nullptr) {
+        std::cerr << "Failed to load 'snowman' mesh!" << std::endl;
+        return -1;
+    }
+
+    mesh_three = MeshLoader::loadMesh("res/christmas-tree");
+    if (mesh_three == nullptr) {
+        std::cerr << "Failed to load 'christmas-tree' mesh!" << std::endl;
         return -1;
     }
 
@@ -62,5 +92,6 @@ int loadResources() {
 void unloadResources() {
     delete mesh_xyz;
     delete mesh_snowman;
+    delete mesh_three;
     delete shader;
 }