Final Quiz

Question 1

Which one is correct about joint in maya?

Answer 1

After bind the skin with the joint, every vertex on the skin will have weights from the joints, each joint can have different weight on different vertex, weight is ranged from 0 to 1, a value of 1 means full control, a value of 0 means no control, a value of 0.5 means 50% control, the weight can be changed by painting weight.

Question 2

Which one is NOT correct about rigging.

Answer 2

rigging is building joints, bind joints with skins and create controllers, so every rig needs joints to start

Question 3

What is wrong about weight painting?

Answer 3

If you have the joint you don’t what to change, lock it to keep it safe.

Question 4

What is IK and FK

Answer 4

IK means use the end joint to control the rotation of it’s parent joints. FK means general parent system.

Question 5

what is right about nameing convention

Answer 5

You can have your own ways of naming, but it needed to be consistant

Question 6

What is right about weighting

Answer 6

Subtraction is dangerous, you may only want to use it to tweek small areas.

Question 7

What happens if you have both IK and FK created on the arm

Answer 7

Normally IK will take over the control, but you can use IK FK blend to blend between IK and FK

Question 8

What is right about our spine rig

Answer 8

The hierarchy is(low to high): joint chain -> spline curve -> cluster-> controller.

Question 9

why we need two groups on the finger ?

Answer 9

The first group is used for set driven key so we can have an extra layer of control of the fingers

Question 10

What is wrong about set driven key?

Answer 10

It’s just like keying in animation, but instead of keying along time, it keys along the attribute of anonther object.

Question 11

What is wrong about ik fk switch

Answer 11

For the arm,IK and FK should all follow the chest.

Question 12

What is right about constrain?

Answer 12

you can have multiple constrains on a single object

Question 13

What is the benifit of creating 3 joint chain for leg or arms?

Answer 13

because that is the only way we can have an IK FK blend

Question 14

How to find the right location for the IK knee controller?

Answer 14

creat a triangle pologon that has it’s 3 vertex snaped to the 3 joints on the leg, and then drag the vertex on the knee out using the N direction of the nromal axis mode to move it out alittle bit. and the right location should be right at the position of that vertex

Question 15

What is the the IK driver joints are doing on the foot?

Answer 15

they serve as extra povit to rotate based on

Question 16

what is the idea to fix the orientation of the controller on the ankle

Answer 16

you have to disable the control they have on the joints, and then create a group for the controller, use locator to align their group to the right orientation. after that, you can get every thing back.

Question 17

What’s the result of 16 to the power of 0.5?

Answer 17

4

Question 18

If I scale the joint of the neck on the X direction n times, what’s the scale Y and Z should be to maintain the vloume of the neck?

Answer 18

1/ (n^0.5)

Question 19

what’s the proper way to rig eyes?

Answer 19

use single chain IK

Question 20

What’s the shape of the eye brow should like when you rise it up

Answer 20

like a curve

Question 21

How do we connect the blendshape with the rigged head?

Answer 21

We create a master reciver, connect all the blendshapes to the master reciver first, and then connect the master reciver to the rigged head.

Question 22

what is wrong about blendshapes

Answer 22

blendshape only works for pologon.

Question 23

why do we need a facial control window.

Answer 23

we need it because it makes it so much easier to select and move facial controllers.

Question 24

How many blendshape should we create for facial expressions?

Answer 24

depends on the animation you need.

Question 25

What is the benefit of blendshapes compare to joint based rig?

Answer 25

you can define specific shapes

Question 26

What is a color blend node?

Answer 26

It blends two Vector types together, but you can use individual channels as well.

Question 27

What it a condition node?

Answer 27

It will compare two values, if the comparsion fufills the operation, then output True, other wise, output False.

Question 28

What is right about topology?

Answer 28

The edge flow should support the model to deform properly.

Question 29

What actually happens when you are getting double transformation on the spine.

Answer 29

The spine curve is scaled up twice

Question 30

What’s the right way to align a controller to a joint?

Answer 30

parent the controller under the joint, and then, zero out the translations of the controller, after that, group the controller and unparent the group.

Question 31

why it is so important to have a perfect align between controllers, driver joints, and bind joints?

Answer 31

because perfect alignment makes the constrain between them works with no pop

Question 32

what is right about the twist joint on the lower leg?

Answer 32

they are driven by ankle and knee joints.

Question 33

what is frame cache node?

Answer 33

it gives you the value of the animation curve according to the frame you asking for.

Question 34

what’s the setting for setup spline ik on torso joints?

Answer 34

Default setting with auto simplify curve disabled

Question 35

say you have 9 joints on the torso, how many frame caches at least do you need to do uneven stretch?

Answer 35

4