Shadows are a pro feature of unity. If you have a pro version you go to Edit-> Project Settings-> Quality and can set soft and hard shadows as well as anti aliasing and the quality of the rendering......obviously mobiles are more limited than desktop or browser builds...also if you import standard assets and pro image effects you get a bunch of scripts for using different visual effects on the camera, if you have unity pro. 

To change the appearance of your models you need to use shaders, which determine how a texture is rendered and shown.

That stuff is all Unity specific and vuforia won't affect or limit it...

Ok. Thanks for clarifying.

Vuforia does not introduce particular limitations with respect to the type of visual effects that you can apply to the objects in your scene.

However, keep in mind that the target platform is mobile (Android or iOS), so, certain effects which can work on PC, might not work on mobile (for example, I know there are certain restrictions on the use of shadows in Unity on mobile platforms);

these limitations however are due to the use of a mobile platform, i.e. they are not imposed by Vuforia per se.

Another thing to keep in mind is that Vuforia obviously consumes a certain amount of CPU resources (to perform the tracking), so this may need to be taken into account if for example you want to render very complex scenes on a low-end device. However, this is just a general performance consideration.

I hope this helps.

I have posted here because I don't know if vuforia supports all the effects and properties of Unity? In other words is it possible to augment everything created with unity with vuforia?

Hi, just not sure how this topic relates to Vuforia.

You might have better luck in searching for this issue in the Unity website.