Code re-work and content update: lighting.

src/2.lighting/5.3.light_casters_spot/5.3.lamp.fs

@@ -0,0 +1,7 @@
+#version 330 core
+out vec4 FragColor;
+
+void main()
+{
+    FragColor = vec4(1.0); // set alle 4 vector values to 1.0
+}

src/2.lighting/5.3.light_casters_spot/5.3.lamp.vs

@@ -0,0 +1,11 @@
+#version 330 core
+layout (location = 0) in vec3 aPos;
+
+uniform mat4 model;
+uniform mat4 view;
+uniform mat4 projection;
+
+void main()
+{
+    gl_Position = projection * view * model * vec4(aPos, 1.0);
+}

src/2.lighting/5.3.light_casters_spot/5.3.light_casters.fs

@@ -1,5 +1,5 @@
 #version 330 core
-out vec4 fragColor;
+out vec4 FragColor;
 
 struct Material {
     sampler2D diffuse;
@@ -55,18 +55,18 @@ void main()
         
         // attenuation
         float distance    = length(light.position - FragPos);
-        float attenuation = 1.0f / (light.constant + light.linear * distance + light.quadratic * (distance * distance));    
+        float attenuation = 1.0 / (light.constant + light.linear * distance + light.quadratic * (distance * distance));    
 
         // ambient  *= attenuation; // remove attenuation from ambient, as otherwise at large distances the light would be darker inside than outside the spotlight due the ambient term in the else branche
         diffuse   *= attenuation;
         specular *= attenuation;   
             
         vec3 result = ambient + diffuse + specular;
-        fragColor = vec4(result, 1.0f);
+        FragColor = vec4(result, 1.0);
     }
     else 
     {
         // else, use ambient light so scene isn't completely dark outside the spotlight.
-        fragColor = vec4(light.ambient * texture(material.diffuse, TexCoords).rgb, 1.0f);
+        FragColor = vec4(light.ambient * texture(material.diffuse, TexCoords).rgb, 1.0);
     }
 } 

src/2.lighting/5.3.light_casters_spot/5.3.light_casters.vs

@@ -13,9 +13,9 @@ uniform mat4 projection;
 
 void main()
 {
-    FragPos = vec3(model * vec4(aPos, 1.0f));
+    FragPos = vec3(model * vec4(aPos, 1.0));
     Normal = mat3(transpose(inverse(model))) * aNormal;  
     TexCoords = aTexCoords;
     
-    gl_Position = projection * view * vec4(FragPos, 1.0f);
+    gl_Position = projection * view * vec4(FragPos, 1.0);
 }