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properties of real-world environment, whether existing or fiction. However, a world where the
governing space, time, mechanics, material properties and others physical laws that used to control all
these were no longer hold can be create by exceeding the limits of physical reality.
According to Milgram 1994, for proposed the concept of a “Virtuality continuum”, it is a
clear way to identify and classify the combined classes of visual different types of display
technologies. On the figure 1below, we can see that the real environment is shown at the left end of
the continuum. This is where everything we seen is real with nothing from computer generated
simulation. For example, when we watch any video display a real world scene, while on the right end
of the extremum, it is where the environment, we seen is contained totally virtual object. For example,
a conventional computer visual simulation in the middle, we can view a mixed reality environment, in
which simulations that combine real world images and virtual world images: augmented reality and
augmented Virtuality. In Augmented reality, most part of the images are real, just like when using
your smartphone camera to play Pokémon go in real environment. In Augmented Virtuality, most part
of the imagery is simulated by computers, the most common use in virtual sets of television shows
where people are projected into an imagery environment with green screen.

Figure 1: Virtuality Continuum [5]

Challenges and Problem Areas Analysis: Mixed Reality Design
When the user is not possible to separate between the virtual element and the real elements in the
resulting environment, then a mixed reality is convincing as real. According to Jacobs & Loscos
(2006), a successful convincing real mixed reality must have the following factors presented in it [8].

The Resulting Scene Needs to Have Consistent Shadow Configuration After Including The Virtual
Object
The main difficulty to meet this requirement is to find the correct appearance of new shadows: the
object’s position on the scene, shapes and colours. Sometimes it is estimated, but they can be
accurately calculated if the scene geometry, illumination characteristics and materials the properties of
all objects in the scene known.

Virtual Objects Needs to Look Naturally
Great effort has to be done in modelling the objects for a more realistic look because a animation like
virtual object is easily detectable by users. One of the successful technique can be used is image-based
modelling whereas the objects are rendered with real image textures.

The Illumination of The Virtual Objects Needs to resemble the illumination Of the Real Objects
To achieve this requirement, two possible methodologies can be used. Illuminate the virtual object or
all material properties of all objects in the scene with the illumination pattern of the real scene that are
known or estimated, which allows a consistent known illumination pattern to be delighted with the
entire scene.

All Update Computation Needs to Occur In Real Time If User Able To Interact In MR
Environment