Исправление шейдера для работы с нормалями

lab2/res/cube.mtl

@@ -1,12 +1,12 @@
 # Blender MTL File: 'cube.blend'
 # Material Count: 1
 
-newmtl Material
+newmtl CubeColor
 Ns 250.000000
 Ka 1.000000 1.000000 1.000000
-Kd 0.800000 0.800000 0.800000
+Kd 0.800000 0.447721 0.037177
 Ks 0.500000 0.500000 0.500000
 Ke 0.000000 0.000000 0.000000
-Ni 1.000000
+Ni 1.450000
 d 1.000000
 illum 2

lab2/res/cube.obj

@@ -16,7 +16,7 @@ vn -1.0000 0.0000 0.0000
 vn 0.0000 -1.0000 0.0000
 vn 1.0000 0.0000 0.0000
 vn 0.0000 0.0000 -1.0000
-usemtl Material
+usemtl CubeColor
 s off
 f 5//1 3//1 1//1
 f 3//2 8//2 4//2

lab2/res/main.vsh

@@ -5,10 +5,18 @@ layout (location = 1) in vec3 v_normal;
 
 out vec4 a_color;
 uniform mat4 projview;
+uniform mat4 model;
 
 void main(){
 //	gl_Position = vec4(v_position, 1) * projview;
-	gl_Position = projview * vec4(v_position, 1);
-	a_color = vec4(0.5, 0, 1, 1);
+	gl_Position = projview * model * vec4(v_position, 1);
+
+	// dot получается [-1 ... 1]
+	float l = dot((model * vec4(v_position, 1)).xyz, normalize(vec3(1, 1, 1)));
+	// сначала делаем диапазон [1 ... 3]
+	// потом [0.5 ... 1]
+	l = (l + 2) / 3;
+
+	a_color = vec4(vec3(0.5, 0, 1) * l, 1);
 }
 

lab2/src/main.cpp

@@ -87,17 +87,18 @@ static void drawWorld(Camera& cam) {
 
 //    shader->uniformMatrix("pr", cam.getProjection() * cam.getView());
     shader->uniformMatrix("projview", projview);
+    shader->uniformMatrix("model", glm::mat4(1.0f));
     world->draw();
 
     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(0, 0, -2));
+    auto model_translate = glm::translate(glm::mat4(1.0f), glm::vec3(0, 0, -3));
     auto model_rotate = glm::rotate(glm::mat4(1.0f), angle, glm::vec3(0, 1, 0));
-    angle += 0.001f;
+    angle += 0.0002f;
 
-    shader->uniformMatrix("projview", projview * model_scale * model_translate * model_rotate);
+    shader->uniformMatrix("model", model_scale * model_translate * model_rotate);
 //    world->draw();
     model_mesh->draw();
 }
@@ -175,7 +176,8 @@ int main() {
     loadResources();
 
 //    glDisable(GL_DEPTH_TEST);
-    glDisable(GL_CULL_FACE);
+//    glDisable(GL_CULL_FACE);
+    glEnable(GL_DEPTH_TEST);
 
     Camera cam(glm::vec3(0, 0, 5), glm::radians(90.0f));