fix shader issue + demo assets

demos/art/meshes/nav_test.mtl

@@ -0,0 +1,12 @@
+# Blender 4.0.2 MTL File: 'None'
+# www.blender.org
+
+newmtl Default
+Ns 0.000000
+Ka 1.000000 1.000000 1.000000
+Ks 0.000000 0.000000 0.000000
+Ke 0.000000 0.000000 0.000000
+Ni 1.450000
+d 1.000000
+illum 1
+map_Kd E:/v4k/demos/art/cubemaps/stardust/posz.png

demos/art/meshes/sphere2.mtl

@@ -0,0 +1,2 @@
+# Blender 4.0.2 MTL File: 'None'
+# www.blender.org

engine/art/shaders/vs_323444143_16_3322_model.glsl

@@ -114,7 +114,7 @@ void main() {
     
     //   vec3 tangent = att_tangent.xyz;
     //   vec3 bitangent = cross(att_normal, att_tangent.xyz) * att_tangent.w;
-    v_normal_ws = normalize(vec3(model * vec4(v_normal, 0.))); // normal to world/model space
+    v_normal_ws = normalize(vec3(att_instanced_matrix * vec4(v_normal, 0.))); // normal to world/model space
     v_normal = normalize(v_normal);
     v_position = att_position;
     v_texcoord = att_texcoord;