triangles upper and lower layer, low vertex reuse

shaders/shader.vert

@@ -16,7 +16,7 @@ layout(location = 0) out vec3 geoColor;
 layout(location = 1) out vec2 geoTexCoord;
 
 void main() {
-    gl_Position = ubo.geom_rot * ubo.model *  vec4(inPosition, 1.0);
+    gl_Position = ubo.proj * ubo.view * ubo.geom_rot * ubo.model *  vec4(inPosition, 1.0);
     geoColor = inColor;
     geoTexCoord = inTexCoord;
 }