diff --git a/src/shaders/simple.vs b/src/shaders/main.vs
similarity index 78%
rename from src/shaders/simple.vs
rename to src/shaders/main.vs
index 36680ec..018c6cc 100644
--- a/src/shaders/simple.vs
+++ b/src/shaders/main.vs
@@ -4,6 +4,7 @@
 layout (location = 0) in vec3 position;  // Vertex position in local space (model space)
 layout (location = 1) in vec3 normal;    // vertex normal
 layout (location = 2) in vec2 texCoord;     // Vertex texture uv
+layout (location = 3) in mat4 instanceModel;     // Vertex texture uv
 
 // Output to fragment shader
 out vec3 vertexPos;
@@ -15,12 +16,15 @@ out vec4 fragPosLightSpace;
 uniform mat4 u_model;       // Model matrix: transforms from local space to world space
 uniform mat4 u_view;        // View matrix: transforms from world space to camera space (view space)
 uniform mat4 u_projection;  // Projection matrix: transforms from camera space to clip space
+uniform bool u_isInstanced;
 
 void main()
 {
-    vertexPos = vec3(u_model * vec4(position, 1.0));
+    mat4 model = u_isInstanced ? instanceModel : u_model;
 
-    mat3 normalMatrix = mat3(transpose(inverse(u_model)));
+    vertexPos = vec3(model * vec4(position, 1.0));
+
+    mat3 normalMatrix = mat3(transpose(inverse(model)));
     vertexNormal = normalMatrix * normal;
     // vertexNormal = normal;