Add Normal in vertex. And add light in shader.

Map3DRendering/Shaders/shader.frag

@@ -3,9 +3,12 @@
 out vec4 outputColor;
 
 uniform vec3 viewPos;
+uniform vec3 lightPos;
+uniform vec3 lightColor;
 uniform sampler2D texture0;
 
 in vec4 FarColor;
+in vec3 Normal;
 in vec3 FragPos;
 in vec2 TexCoord;
 in vec4 TexType;
@@ -41,8 +44,14 @@ void main()
     vec4 mix2 = mix(blendedColor[1], blendedColor[3], weightX);
     vec4 finalColor = mix(mix1, mix2, weightY);
 
+    vec3 norm = normalize(Normal);
+    vec3 lightDir = normalize(lightPos - FragPos);
+    float diff = max(dot(norm, lightDir), 0.0);
+    vec3 diffuse = diff * lightColor;
+
+    vec4 litColor = vec4(diffuse, 1.0) * finalColor;
 
     float distance = length(viewPos - FragPos);
     float interpolationFactor = clamp(distance / 1000.0, 0.0, 1.0);
-    outputColor = mix(finalColor, FarColor, interpolationFactor);
+    outputColor = mix(litColor, FarColor, interpolationFactor);
 }

Map3DRendering/Shaders/shader.vert

@@ -1,16 +1,18 @@
 #version 330 core
 layout (location = 0) in vec3 aPos;
-layout (location = 1) in vec4 aColor;
-layout (location = 2) in vec4 aColorFar;
-layout (location = 3) in vec2 aTexCoord;
-layout (location = 4) in vec4 aTexType;
-layout (location = 5) in float aRealTexType;
+layout (location = 1) in vec3 aNormal;
+layout (location = 2) in vec4 aColor;
+layout (location = 3) in vec4 aColorFar;
+layout (location = 4) in vec2 aTexCoord;
+layout (location = 5) in vec4 aTexType;
+layout (location = 6) in float aRealTexType;
 
 uniform mat4 model;
 uniform mat4 view;
 uniform mat4 projection;
 
 out vec3 FragPos;
+out vec3 Normal;
 out vec4 Color;
 out vec4 FarColor;
 out vec2 TexCoord;
@@ -21,6 +23,7 @@ void main()
 {
     gl_Position = vec4(aPos, 1.0) * model * view * projection;
     FragPos = vec3(vec4(aPos, 1.0) * model);
+    Normal = aNormal;
     Color = aColor;
     FarColor = aColorFar;
     TexCoord = aTexCoord;