New GenMeshCustom, UpdateMesh and lightmap example.

examples/resources/shaders/glsl330/lightmap.fs

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+#version 330
+// Input vertex attributes (from vertex shader)
+in vec2 fragTexCoord;
+in vec2 fragTexCoord2;
+in vec3 fragPosition;
+in vec4 fragColor;
+in vec3 fragNormal;
+
+// Input uniform values
+uniform sampler2D texture0;
+uniform sampler2D texture1;
+
+// Output fragment color
+out vec4 finalColor;
+
+void main() {
+	// Texel color fetching from texture sampler
+    vec4 texelColor = texture( texture0, fragTexCoord );
+    vec4 texelColor2 = texture( texture1, fragTexCoord2 );
+    vec3 normal = normalize( fragNormal );
+	finalColor = texelColor * texelColor2;
+}

examples/resources/shaders/glsl330/lightmap.vs

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+#version 330
+// Input vertex attributes
+in vec3 vertexPosition;
+in vec2 vertexTexCoord;
+in vec2 vertexTexCoord2;
+in vec3 vertexNormal;
+// in vec4 vertexColor;
+
+// Input uniform values
+uniform mat4 mvp;
+uniform mat4 matModel;
+uniform mat4 matNormal;
+
+// Output vertex attributes (to fragment shader)
+out vec3 fragPosition;
+out vec2 fragTexCoord;
+out vec2 fragTexCoord2;
+// out vec4 fragColor;
+out vec3 fragNormal;
+
+void main() {
+    // Send vertex attributes to fragment shader
+    fragPosition = vec3( matModel * vec4( vertexPosition, 1.0 ) );
+    fragTexCoord = vertexTexCoord;
+    fragTexCoord2 = vertexTexCoord2;
+    // fragColor = vertexColor;
+    fragNormal = normalize( vec3( matNormal * vec4( vertexNormal, 1.0 ) ) );
+
+    // Calculate final vertex position
+    gl_Position = mvp * vec4( vertexPosition, 1.0 );
+}