Research and investigation: Understanding Human Anatomy
To be successful in creating a convincing bipedal 3D character, it is important to study how the muscles in a biped are placed in relation to each other. It would be easy to create a stickman and wrap it around the biped, but creating an anatomically correct character will appear to be more realistic. Human anatomy will be used as the example:

Using this example, I sketched a diagram showing the different sections of muscles which would be modelled in 3DS Max to give my biped a convincing shape:

Regardless of whether the biped will be human; robotic or alien, the same anatomical principles apply:

Honda's ASIMO robot has arms with shoulder joints, upper arm "muscles" and lower arm "muscles" to help with movement and lifting and its legs have two distinct sections connected by knee joints. The NS-5 robot on the right from the film I, Robot has a similar structure and the mechanical muscles are clearly visible.

As seen here in the movie AI, the humanoid alien creatures carry the same upper body muscular structure; albeit with elongated necks.
In conclusion, when creating a bipedal character, it is important to get the basic anatomy correct as inaccurate body structures will look unrealistic and will make it harder for the viewer to accept the way the character moves. And if the viewer is thinking "how does that thing move?", any suspension of disbelief quickly disappears and it distracts them from the point/story of the video.

Using this example, I sketched a diagram showing the different sections of muscles which would be modelled in 3DS Max to give my biped a convincing shape:

Regardless of whether the biped will be human; robotic or alien, the same anatomical principles apply:

Honda's ASIMO robot has arms with shoulder joints, upper arm "muscles" and lower arm "muscles" to help with movement and lifting and its legs have two distinct sections connected by knee joints. The NS-5 robot on the right from the film I, Robot has a similar structure and the mechanical muscles are clearly visible.

As seen here in the movie AI, the humanoid alien creatures carry the same upper body muscular structure; albeit with elongated necks.
In conclusion, when creating a bipedal character, it is important to get the basic anatomy correct as inaccurate body structures will look unrealistic and will make it harder for the viewer to accept the way the character moves. And if the viewer is thinking "how does that thing move?", any suspension of disbelief quickly disappears and it distracts them from the point/story of the video.
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